Liebert Series 610 UPS
GUIDE SPECIFICATIONS
for a 225kVA
Single-Module Uninterruptible Power System
1.0	GENERAL
1.1	SUMMARY
These specifications describe requirements for an Uninterruptible Power System (UPS). The UPS shall automatically maintain AC power within specified tolerances to the critical load, without interruption, during failure or deterioration of the normal power source.
The manufacturer shall design and furnish all materials and equipment to be fully compatible with electrical, environmental, and space conditions at the site. It shall include all equipment to properly interface the AC power source to the intended load and be designed for unattended operation.
1.2	STANDARDS
The UPS and all associated equipment and components shall be manufactured in accordance with the following applicable standards:
•	CSA 22.2, No. 107.1
•	IEEE 587, Category B (ANSI C62.41)
•	National Electrical Code (NFPA 70)
•	NEMA PE-1
•	OSHA
•	UL Standard 1778
The UPS shall be ETL listed per UL Standard 1778 Uninterruptible Power Supplies, and shall be CSA certified.
The Quality System for the engineering and manufacturing facility shall be certified to conform to Quality System Standard ISO 9001 for the design and manufacture of power protection systems for computers and other sensitive electronics.
1.3	SYSTEM DESCRIPTION
1.3.1	Design Requirements
The UPS shall be sized to provide a minimum of 225kVA and a minimum of 180kW output. 
Load voltage and bypass line voltage shall be ____VAC, three phase, 3-wire or 4-wire. Input voltage shall be ____VAC, three-phase, 3-wire.
The battery shall support the UPS at 100% rated kW load for at least _____ minutes at 77F (25C) at startup.
1.3.2	
Modes of Operation
The UPS shall operate as an on-line reverse transfer system in the following modes:
A.	Normal: The critical AC load is continuously powered by the UPS inverter. The rectifier/ charger derives power from the utility AC source and supplies DC power to the inverter, while simultaneously float charging the battery.
B.	Emergency: Upon failure of utility AC power, the critical AC load is powered by the inverter which, without any switching, obtains its power from the battery plant. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.
C.	Recharge: Upon restoration of the utility AC source, the rectifier/charger powers the inverter and simultaneously recharges the battery. This shall be an automatic function and shall cause no interruption to the critical AC load.
D.	Bypass: If the UPS must be taken out of service for maintenance or repair, the static transfer switch shall transfer the load to the bypass source. The transfer process shall cause no interruption in power to the critical AC load.
E.	Off-Battery: If the battery only is taken out of service for maintenance, it is disconnected from the rectifier/charger and inverter by means of an external disconnect circuit breaker. The UPS shall continue to function and meet all of the specified steady-state performance criteria, except for the power outage back-up time capability.
1.3.3	Performance Requirements
The maximum working voltage, current, and di/dt of all solid-state power components and electronic devices shall not exceed 75% of the ratings established by their manufacturer. The operating temperature of solid-state component sub-assemblies shall not be greater than 75% of their ratings. Electrolytic capacitors shall be computer grade and be operated at no more than 95% of their voltage rating at the maximum rectifier charging voltage.
1.3.4	Input
A.	Voltage Range: +10%, -15% of nominal (no battery discharge at -20%).
B.	Frequency Range: 5%.
C.	Rectifier Walk-In/Inrush Current Limiting: 20% to 100% of full rated load over 15 seconds (adjustable).
D.	Sub-Cycle Magnetizing Inrush: Not to exceed 2-3 times normal full load input current for modules without optional input isolation transformer. Not to exceed 5-8 times normal full load input current with optional input isolation transformer and optional input filter.
E.	Power Factor: Minimum 0.85 lagging at full load with nominal input voltage (may be increased to 0.92 lagging with optional input filter).
F.	2-Step Rectifier Input Current Limit: 
Step 1 - Factory set at 115% (adjustable 100-125%) normal full load input current 
Step 2 - Factory set at 100% (adjustable 85-125%) for on-generator operation
G.	2-Step Battery Charge Current Limit: 
Step 1 - Factory set at 10% (adjustable 1-25%) maximum battery discharge current. 
Step 2 - Factory set at 1% (adjustable 1-25%) maximum battery discharge current.
H.	Reflected Current Distortion: Less than 30% THD at full load input current. The optional input filter shall reduce reflected input current distortion to less than 7% THD at full load.
I.	Surge Protection: Sustains input surges without damage per criteria listed in ANSI C62.41-1980.
1.3.5	
AC Output
A.	Load Rating: 104% continuous load rating at 104F (40C) for any combination of linear and non-linear loads at the capacity of the connected modules or rating of the system control console, whichever is less.
10 times continuous load rating for three cycles without closing the bypass breaker.
Load rating limited by system circuit breaker characteristics.
B.	Voltage Regulation: 0.5% for balanced load, 2% for 50% unbalanced load.
C.	Voltage Adjustment Range: 5% manually.
D.	Automatic Line Drop Compensation: Adjustable 0 to +5% of nominal voltage.
E.	Frequency Regulation: 0.1%.
F.	Efficiency: Defined as output kW/input kW at rated lagging load power factor.
Not less than 94% for 480/480 VAC or 600/600 VAC input/output;
Not less than 93.5% for 480/208 VAC input/output or 600/208 VAC input/output;
Not less than 92.5% for 208/208 VAC input/output;
Not less than 92.5% for 480/480 VAC input/output with optional isolation transformer;
Optional input filter efficiency loss not to exceed 0.5%.
G.	Phase Imbalance: 
Balanced loads 120 1,
50% unbalanced loads 120 3.
H.	Unbalanced Voltage Regulation (RMS Voltage Balance, Each Phase to the Average):
Balanced Load, 1% from the arithmetic average of the 3 phases.
20% Unbalanced Load, 1% from the arithmetic average of the 3 phases.
50% Unbalanced Load, 2% from the arithmetic average of the 3 phases.
I.	Voltage Transients (Average of all Three Phases):
20% Load Step				4%
50% Load Step				4%
100% Load Step			5%
Loss of/return to AC input power	1%
Transfer to/from Bypass			4%
J.	Output Voltage Transients
Voltage transients shall be limited to a maximum deviation from nominal system output volts of plus or minus 5% with recovery to within 1% of the nominal output voltage within one electrical cycle (16 milliseconds) for each of the following conditions. Limits shall apply to any UPS load within the UPS rating, and frequency shall be maintained at 60 Hertz plus or minus 0.1 Hertz. The system shall not transfer to bypass under these conditions (except item 3).
1.	100% load step.
2.	Loss or return of AC input power, momentary sags, surges or spikes on the input to the UPS (all three phases or single phase).
3.	Uninterrupted transfer of the critical load to and from the UPS output and bypass power line (manually initiated or automatic).
4.	Trip a 10% rated ampere branch circuit breaker or clear a 10% rated fuse with a single-phase or three-phase fault.
K.	
Voltage Harmonic Distortion:
Maximum 4% RMS total, maximum 2% any single harmonic (linear load).
Maximum 5% RMS total for up to 100% non-linear load.
L.	Overload at full Output Voltage with 2% voltage regulation: 
104% continuously. 
125% of full load for 10 minutes
150% of full load for a minimum of 30 seconds.
M.	Current Limit: 155% full load current.
N.	Fault Clearing: Sub-cycle current of at least 300% but not more than 500% of normal full load current (when bypass is not available).
1.3.6	Grounding
The AC output neutral shall be electrically isolated from the UPS chassis. The UPS chassis shall have an equipment ground terminal. A terminal for bonding the system neutral to facility service entrance ground (customer-provided cable) shall be provided.
1.4	ENVIRONMENTAL CONDITIONS
The UPS shall be able to withstand the following environmental conditions without damage or degradation of operating characteristics:
A.	Operating Ambient Temperature
UPS 32F to 104F (0C to 40C) without derating.
(Consult factory for performance derating over 104F; 40C.)
Battery 77F (25C), 5F (3C).
B.	Storage/Transport Ambient Temperature
-4F to 158F (-20C to 70C).
C.	Relative Humidity
0 to 95%, non-condensing.
D.	Altitude
Operating - To 4,000 ft. (1,219m) above Mean Sea Level without derating. 
Consult factory for derating above 4,000 ft. (1,219m) elevation.
Storage/Transport - To 50,000 ft. (15,000m) above Mean Sea Level.
E.	Audible Noise
Noise generated under any typical condition shall not exceed 65 dBA measured 5 ft. (1.5m) from the UPS.
1.5	
SUBMITTALS
1.5.1	Proposal Submittals
Submittals with the proposal shall include:
1.	System configuration with single-line diagrams.
2.	Functional relationship of equipment including weights, dimensions, and heat dissipation.
3.	Descriptions of equipment to be furnished, including deviations from these specifications.
4.	Size and weight of shipping units to be handled by contractor.
5.	Detailed layouts of customer power and control connections.
6.	Descriptive list of site services and maintenance to be offered.
1.5.2	60 Day Submittals
Submittals 60 days prior to UPS delivery shall include:
1.	Detailed installation drawings including all terminal locations.
2.	Interconnect wiring diagrams showing conduit wiring with terminal numbers for each wire.
3.	Descriptive list of site services and maintenance to be offered.
1.5.3	UPS Delivery Submittals
Submittals upon UPS delivery shall include:
1.	A complete set of submittal drawings.
2.	Two (2) sets of instruction manuals. Manuals shall include a functional description of the equipment, safety precautions, instructions, step-by-step operating procedures and routine maintenance guidelines, including illustrations.
3.	Descriptive list of site services and maintenance to be offered.
1.6	
WARRANTY
1.6.1	UPS Warranty
The UPS manufacturer shall warrant the unit against defects in workmanship and materials for 12 months after initial start-up or 18 months after ship date, whichever comes first.
1.6.2	Battery
1.6.2.1	Flooded (Wet) Cell Batteries
The battery manufacturer's standard warranty shall be passed through to the end user.
1.6.2.2	VRLA (Valve-Regulated Lead-Acid “Sealed”) Batteries
Manufacturer shall supply a written warranty covering the complete terms of the VRLA battery warranty, which shall include a period of three (3) years from the date of shipment on a full replacement basis; and after the first year, an additional seven (7) years on a pro rata basis.
1.6.3	Warranty - End User
Warranties associated with buy-out items shall be passed through to the end user.
1.7	QUALITY ASSURANCE
1.7.1	Manufacturer Qualifications
A minimum of 20 years' experience in the design, manufacture, and testing of solid-state UPS systems is required.
1.7.2	Factory Testing
Before shipment, the manufacturer shall fully and completely test the system to ensure compliance with the specification. These tests shall include operational discharge and recharge tests to ensure guaranteed rated performance.
2.0	
PRODUCT
2.1	FABRICATION
2.1.1	Materials
All materials of the UPS shall be new, of current manufacture, high grade and shall not have been in prior service except as required during factory testing. All active electronic devices shall be solid-state. All power semi-conductors shall be sealed. Control logic and fuses shall be physically isolated from power train components to ensure operator safety and protection from heat. All electronic components shall be accessible from the front without removing sub-assemblies for service access.
2.1.2	Wiring
Wiring practices, materials and coding shall be in accordance with the requirements of the National Electrical Code, OSHA, and applicable local codes and standards. All bolted connections of bus bars, lugs, and cables shall be in accordance with requirements of the National Electric Code and other applicable standards. All electrical power connections shall be torqued to the required value and marked with a visual indicator.
Provisions shall be made in the cabinets to permit installation of input, output, and external control cabling, using raceway or conduit. Provision shall be made for ___ (top/bottom) ___ access to input, output, bypass and DC connections. In conformance with NEC, connection cabinets shall provide for adequate wire bend radius. All copper bus bars for customer power connections shall be tin plated for connection integrity.
2.1.3	Construction and Mounting
The UPS shall be in NEMA Type 1 enclosures, designed for floor mounting. The UPS shall be structurally adequate and have provisions for hoisting, jacking, and forklift handling. Maximum cabinet height shall be 79 in. (201cm).
2.1.4	Cooling
Adequate ventilation shall be provided to ensure that all components are operated well within temperature ratings. The cabinet blowers shall be redundant so that a single blower failure will not cause temperatures to increase beyond acceptable limits.
Temperature sensors shall be provided to monitor UPS internal temperature. Upon detection of temperatures in excess of manufacturer's recommendations, the sensors shall cause audible and visual alarms to be sounded on the UPS control panel. A separate room ambient temperature sensor shall be provided to give an alarm if the temperature of the inlet air to the UPS is above specified limits. Air filters shall be located at the point of air inlet and be changeable. No service clearance or ventilation shall be required in the rear of the system.
2.2	
EQUIPMENT
2.2.1	UPS System
The UPS module shall consist of a rectifier/charger and three-phase inverter with associated transformers, static transfer switch with bypass switch, bypass synchronizing circuitry, protective devices, and accessories as specified. The specified system shall also include a battery disconnect breaker and battery system. 
2.2.2	System Protection
The UPS shall have built-in protection against: surges, sags, and over-current from the AC source, overvoltage and voltage surges from output terminals of paralleled sources, and load switching and circuit breaker operation in the distribution system. 
The UPS shall be protected against sudden changes in output load and short circuits at the output terminals. The UPS shall have built-in protection against permanent damage to itself and the connected load for all predictable types of malfunctions. Fast-acting current limiting devices shall be used to protect against cascading failure of solid-state devices. Internal UPS malfunctions shall cause the module to trip off-line with minimum damage to the module and provide maximum information to maintenance personnel regarding the reason for tripping off line. The load shall be automatically transferred to the bypass line uninterrupted for an internal UPS malfunction. The status of protective devices shall be indicated on a graphic display screen on the front of the unit.
2.3	COMPONENTS
2.3.1	Rectifier/Charger
The term rectifier/charger shall denote the solid-state equipment and controls necessary to convert AC to regulated DC for input to the inverter and for charging the battery.
A.	Input Current Reflected Harmonic Distortion
Input current THD shall be less than 30% at full load input current. The optional input filter shall reduce reflected input current distortion to less than 7% THD at full load. 
B.	AC Input Current Limiting
The rectifier/charger shall include a circuit to limit AC input current to an adjustable level of 100% to 125% of the full input current rating. A second circuit shall provide greater limiting (85% to 125%) when signaled by an external contact (i.e., operation of generator). AC input current limit is to be factory set at 115% for normal operation and 100% for generator operation.
C.	Battery Charge Current Limiting
The rectifier/charger shall include a circuit to limit battery charging current to an adjustable level of 1% to 25% of maximum battery discharge current. A second circuit shall provide greater limiting when signaled by an external contact (i.e., operation of generator). Battery charge current limit is to be factory set at 10% for normal operation and 1% for generator operation.
D.	Input Current Walk-In
The rectifier/charger shall provide a feature that limits the total initial power requirement at the input terminals to 20% of rated load, and gradually increases power to 100% of full rating over the 15-second time interval. This walk-in shall be graphically displayed on the front of the unit during start-up. 
E.	Input Circuit Breaker
The rectifier/charger shall have an input circuit breaker. The circuit breaker shall be of the frame size and trip rating to supply full rated load and recharge the battery at the same time. The circuit breaker shall have an under-voltage release to open automatically when the control voltage is lost.
F.	Fuse Protection
Each AC phase shall be individually fused with fast-acting fuses so that loss of any semiconductor shall not cause cascading failures. Fuses shall be bolted to bus bars at both ends to ensure mechanical and electrical integrity. The display panel on the front of the unit shall indicate a blown fuse occurring on any phase of the rectifier.
G.	DC Filter
The rectifier/charger shall have an output filter to minimize ripple current into the battery. The AC ripple voltage of the rectifier DC output shall not exceed 0.5% RMS of the float voltage. The AC ripple current in the battery during float operation shall not exceed 2% RMS of the inverter full load DC current. The filter shall be adequate to ensure that the DC output of the rectifier/charger will meet the input requirements of the inverter without the battery connected.
H.	Battery Recharge
In addition to supplying power for the load, the rectifier/charger shall be capable of producing battery charging current sufficient to replace 95% of the battery discharge power within ten (10) times the discharge time. After the battery is recharged, the rectifier/charger shall maintain the battery at full charge until the next emergency operation.
I.	Battery Equalize Charge
An automatic equalize charge timer feature shall be provided to automatically apply an equalize voltage to the battery after a 30-second or longer utility outage that generates a Battery Discharging alarm. The duration of equalize charge time shall be adjustable from 0 to 72 hours. Manual override shall be provided for the automatic equalize circuit.
J.	Overvoltage Protection
There shall be DC over-voltage protection so that if the DC voltage rises to the pre-set limit, the UPS shall shut down automatically and initiate an uninterrupted load transfer to bypass.
K.	Temperature-Compensated Charging (Optional)
The UPS shall be equipped with a battery temperature sensing unit and automatically reduce the float charge voltage in response to increases in battery temperature. Nominal float voltage shall be 540 VDC (2.25 volts per cell) at 25 degrees Centigrade. This charging setpoint will be automatically reduced 5 VDC for each temperature rise of 5 degrees Centigrade. The module LCD will indicate when the temperature compensation circuit is active.
L.	Battery Load Testing (Optional - VRLA Batteries Only)
The UPS shall be capable of performing battery load testing under operator supervision. To accomplish this, the rectifier/charger will reduce charging voltage to 1.9 volts per cell, to force the batteries to carry the load for a short period of time. If the curve of battery voltage drop indicates diminished battery capacity, the UPS will display an alarm message on the LCD. If the voltage drop indicates battery failure, the UPS will terminate the test immediately and annunciate the appropriate alarms on the LCD. 
2.3.2	
Inverter
The term inverter shall denote the equipment and controls to convert DC from the rectifier/charger or battery to precise AC to power the load. The inverter shall be solid-state, capable of providing rated output power, and for increased performance the inverter shall be a pulse-width-modulated 6-step design and utilize insulated gate bipolar transistors (IGBTs). For reliability, IGBTs will not be paralleled within an inverter assembly, nor will inverter modules be paralleled within a single UPS module. To further enhance reliable performance, the inverter shall not require an inverter output series static switch/isolator for the purposes of overload or fault isolation or transfers to bypass.
A.	Overload Capability
The inverter shall be able to sustain an overload across its output terminals up to 150% with 2% output voltage regulation. The inverter shall be capable of at least 300% current for short circuit conditions. If the short circuit is sustained, the load shall be transferred to the bypass source and the inverter shall disconnect automatically from the critical load bus.
B.	Output Frequency
The inverter shall track the bypass continuously providing the bypass source maintains a frequency of 60 Hz 0.5 Hz. The inverter will change its frequency (slew rate) at 0.1 Hz per second (adjustable 0.01 to 1.0 Hz per second) to maintain synchronous operation with the bypass. This shall allow make-before-break manual or automatic transfers. If the bypass fails to maintain proper frequency, the inverter shall revert to an internal oscillator which shall be temperature compensated and hold the inverter output frequency to 0.1% from the rated frequency for steady-state and transient conditions. Drift shall not exceed 0.1% during any 24-hour period. Total frequency deviation, including short time fluctuations and drift, shall not exceed 0.1% from the rated frequency.
C.	Phase-to-Phase Balance
System logic shall provide individual phase voltage compensation to obtain phase balance of no worse than 2% under all conditions including up to 50% load unbalance, measured against the three-phase average.
D.	Fault Sensing and Isolation
Fault sensing shall be provided to isolate a malfunctioning inverter from the critical load bus to prevent disturbance of the critical load voltage beyond the specified limits. An automatic output circuit breaker shall be provided to isolate a malfunctioning inverter from the critical load.
E.	Output Circuit Breaker
The inverter shall be provided with a motor-operated circuit breaker to isolate the inverter from the critical load bus. This circuit breaker shall be of the correct frame size and trip rating to supply full rated load and overload current as specified elsewhere in this document. The circuit breaker shall work in conjunction with the bypass circuit breaker described in Section 2.3.3 below for both automatic and manual load transfers to and from bypass power.
F.	Battery Protection
The inverter shall be provided with monitoring and control circuits to protect the battery system from damage due to excessive discharge. Inverter shutdown shall be initiated when the battery voltage has reached the end of discharge voltage. The battery end-of-discharge voltage shall be calculated and automatically adjusted for partial load conditions to allow extended operation without damaging the battery. Automatic shutdown based on discharge time is not acceptable.
2.3.3	
Inverter Bypass Operation
For times when maintenance is required or the inverter can not maintain voltage to the load due to sustained overload or malfunction, a bypass circuit shall be provided to isolate the inverter output from the load and provide a path for power directly from an alternate AC (bypass) source. The UPS control system shall constantly monitor the availability of the inverter bypass circuit to perform a transfer. The inverter bypass circuit shall consist of a static transfer switch, a circuit breaker to isolate the inverter, and a bypass circuit breaker in parallel with the static transfer switch. The static transfer switch shall denote the solid-state device, consisting of two reverse-paralleled SCRs (silicon-controlled rectifiers) per phase conductor, that can automatically and instantaneously connect the alternate AC source to the load. The inverter isolation breaker and system bypass breaker shall be motor-operated circuit breakers, self-protecting in case of a fault in the distribution system. Series-rated devices shall not be used for this purpose unless specifically approved by the owner.
A.	Manual Load Transfers
A manual load transfer between the inverter output and the alternate AC source shall be initiated from the control panel. Manually initiated transfers shall be make-before-break utilizing the inverter isolation and bypass circuit breakers. The static switch shall not be required for manual transfers.
B.	Automatic Load Transfers
An automatic load transfer between the inverter output and the alternate AC source shall be initiated if an overload condition is sustained for a time period in excess of the inverter output capability or due to a malfunction that would affect the output voltage. Transfers caused by overloads only shall initiate an automatic retransfer of the load back to the inverter only after the load has returned to a level within the rating of the inverter source. The UPS system logic shall allow 0 to 5 retransfers (adjustable) within any one-hour period to prevent cyclical transfers caused by overloads.
C.	Momentary Overloads
In the event of a load current inrush or branch load circuit fault in excess of the inverter rating, the static transfer switch shall connect the alternate AC source to the load for up to 40 milliseconds allowing up to 1000% of the normal rated output current to flow. Output voltage shall be sustained to the extent the alternate AC source capacity permits. If the overload condition is removed prior to the end of the 40 ms time period, the static transfer switch will turn off and the load shall remain on inverter power. If the overload remains, then a transfer to the alternate AC source is to be completed by closing the bypass circuit breaker.
D.	Protection and Backfeed Prevention
The critical output bus shall be protected from the flow of excess current through the static transfer switch path that may be caused by a low-impedance fault at the output of the UPS system. Each phase of the bypass circuit shall be protected by individual fuses and circuit breakers. Blown fuse monitors shall indicate when a blown fuse will prevent the static transfer switch path from being available for automatic transfers.
As required by UL1778 and CSA, the static transfer switch shall not backfeed UPS power to the bypass distribution system while the UPS is operating on battery during a bypass power outage. The purpose of this requirement is to prevent the risk of electrical shock on the distribution system when the normal source of power is disconnected or has failed. The static transfer switch shall be provided with redundant bypass power outage sensing circuits. The backfeed prevention system shall operate even if two component failures exist simultaneously. If a shorted SCR is detected, the static transfer switch shall be isolated and an alarm message shall be annunciated at the UPS control panel. The load shall remain on conditioned and protected power after detection of a shorted SCR and isolation of the static transfer switch.
2.3.4	
Display and Controls
A.	UPS Control Panel
The term UPS control panel denotes that portion of the UPS containing the display panel and control functions to provide complete monitoring and control through the use of menu-prompted commands. Membrane switches shall be used to select and execute operations from a Master Menu. The display and control panel shall be mounted on the SMS control section door. The display panel shall be 640 X 200 pixel, Liquid Crystal Display.
B.	Logic
UPS system logic and control programming shall be resident in Application Specific Integrated Circuits. Rectifier, inverter, and system control logic shall be solid state. Switches, contacts, and relays shall only be used to signal the logic system as to the status of mechanical devices or to signal user control inputs. Relays shall be used to isolate the logic for customer external status and alarm signaling.
C.	Metered Values
A microprocessor shall control the display and memory functions of the monitoring system. All three phases of three-phase parameters shall be displayed simultaneously. All voltage and current parameters shall be monitored using true RMS measurements for accurate (1%) representation of non-sinusoidal waveforms typical of computers and other sensitive loads. The following parameters shall be displayed:
1.	Input voltage, Line-to-Line
2.	Input current
3.	Battery voltage
4.	Battery charging/discharging current
5.	Inverter voltage, Line-to-Line
6.	Inverter frequency
7.	Bypass input voltage, Line-to-Line
8.	Bypass input frequency
9.	Load current
10.	Load kVA
11.	Load kW
12.	Total operating hours shall be available on a separate display screen
13.	Battery temperature (optional)
D.	
Power Flow Indications
A power flow diagram shall graphically depict whether the load is being supplied from the inverter, bypass, or battery and provide, on the same screen, the status of the following components:
1.	AC input circuit breaker.
2.	Battery circuit breaker.
3.	Inverter output circuit breaker.
4.	Bypass circuit breaker.
5.	Static Transfer Switch (Connected, Disconnected).
6.	Time to overload transfer.
E.	Battery Status Indicator
A battery status indicator shall display DC alarm conditions, shutdown voltages, the present battery voltage, and battery time remaining during discharge. A graphical representation of the battery voltage during the discharge shall be displayed. The graphical representation shall remain in the monitoring system memory until the next discharge occurs and shall be available for review of the battery performance, battery charge percentage, battery time remaining and estimated time remaining.
F.	Battery Cycle Monitor
The UPS shall have a Battery Cycle Monitor (BCM) built into system firmware to document the cycle service of the battery. It shall collect and retain information on the last 132 events that involved discharging the UPS battery. Each battery discharge cycle is to be put into one of four categories, depending on the duration of the event:
•	0-30 Seconds Discharge
•	31-90 Seconds Discharge
•	91-240 Seconds Discharge
•	Over 240 Seconds Discharge
The BCM shall collect and retain this information for each discharge cycle:
•	System time and date
•	Event Number
•	Duration of cycle (seconds)
•	Lowest DC Bus Voltage
•	Highest DC Bus Current
•	kW carried by the batteries at the start of cycle, and 
•	Battery Environment Ambient Temperature (optional).
In addition, the BCM shall retain summary information on the total number of events, the cumulative ampere hours and the total discharge time since a given date.
The BCM shall be capable of storing information for up to 132 discharge cycle events in its data buffer. When the buffer approaches its capacity, a warning message shall be broadcast via terminal and modem communication channels and a complete listing of all records (in order of occurrence) shall be sent to the terminal port. Once the buffer is filled, new data will replace the old on a First-In, First-Out basis as new cycles occur.
The UPS operator shall be able to select either the BCM Summary screen or one of four screens showing detailed information on any one of the four categories of discharge (0-30 seconds, 31-90 seconds, 91-240 seconds and Over 240 seconds).
The Summary screen will ordinarily show Total Number of Discharge Cycles, Accumulated Battery Time, Accumulated Battery Amp Hours, Accumulated Battery Kilowatt Hours and the current temperature at the spot where the optional Battery Temperature Sensor has been positioned. During a battery discharge event, the screen shall change to show information about the current discharge cycle. The screen shall display Active Cycle Time in place of Accumulated Battery Time and substitutes Active Battery AH and Active Battery kWh for their accumulated counterparts.
The UPS shall allow this information to be collected remotely, through the communications board and modem, by a remote terminal or a personal computer equipped with a modem and communications program.
G.	Alarms
The control panel shall report the system-level alarms listed below. An audible alarm shall be activated when any of the alarms below occurs. All alarms shall be displayed in text form.
Input Fail				Output Over/Under Frequency
Control Power Fail			Output Under-voltage
DC Ground Fault 			Output Over-voltage
DC Capacitor Fuse Blown		Overload
Battery CB Open			Overload Transfer
Battery Discharging 			Overload Shutdown
Low Battery Warning 			Reverse Power
Low Battery Shutdown			Rectifier Fuse Blown
DC Over-voltage Shutdown		Inverter Fault
Load On Bypass			Hardware Shutdown
Auto Retransfer Primed			Emergency Off
Manual Reset/Retransfer 		Ambient Over-temperature
Static Switch Unable			Blower Failed
Bypass Not Available			Equipment Over-temperature
Bypass Phase Sequence Wrong		Over-temperature Timeout
H.	Controls
System-level control functions shall be:
1.	UPS/Bypass transfer pushbuttons 
2.	AC Output Voltage Adjust 5%
3.	Battery Circuit Breaker Trip pushbutton
4.	Emergency Module Off pushbutton with protective cover
5.	Horn Off pushbutton
6.	Control Enable pushbutton
7.	Display control pushbuttons: Up, Down, Select
8.	Alarm Reset pushbutton
I.	Manual Procedures
Start-up, load transfers, and shutdown procedures shall be detailed on the display panel in text and graphic form. 
Start-up
1.	Step-by-step procedure screen including display of UPS voltage, bypass voltage, and phase synchronization.
2.	Walk-in display screen to simultaneously indicate DC volts, output volts, and input phase amps.
3.	Mimic screen to indicate power flow.
Load Transfers
1.	Step-by-step procedure screen
2.	Mimic screen to indicate power flow
Shutdown
1.	Step-by-step procedures screen
2.	Mimic screen to indicate power flow
J.	Emergency Module Off
The UPS control panel shall have a local emergency module off pushbutton with protective cover. Pressing the emergency module off shall cause:
1.	uninterrupted transfer of the load to bypass, and
2.	the input, output, and battery breakers to open, completely isolating the UPS (except bypass) from power.
Provisions shall be available for a remote emergency power off function, which either transfers the load to bypass or completely removes power from the critical bus (operator-selectable) when activated.
2.3.5	Self-Diagnostics
A.	Present Status Screen
The control system shall monitor and display all of the following parameters in a Present Status screen:
Input Voltage, Line-to-Line for all three phases
Input Current for all three phases
Inverter Voltage, Line-to-Line for all three phases
Output Current for all three phases
Inverter Frequency
Battery Voltage
Battery Amps
Load kVA
All three phases of the three-phase parameters shall be displayed simultaneously. All voltage and current parameters shall be monitored using true RMS measurements for accurate (1%) representation of non-sinusoidal waveforms typical of computers and other sensitive loads.
B.	History Status File
A History Status file shall contain all of the information in the Present Status screens except Load kVA. The control system shall maintain this information in discreet 4 millisecond frames (1 millisecond resolution) updating memory on a First-In-First-Out basis. This shall provide status recall of a period of at least 256 milliseconds (64 frames): 160 milliseconds before the malfunction fault (40 frames), the fault frame, and 92 milliseconds after the malfunction (23 frames).
C.	Event History File
The control system shall maintain an event history of the alarm conditions that have occurred during system operation. System memory shall be capable of storing at least 128 events for recall.
D.	System Status File
The control system shall monitor and display the total operating hours of the UPS system.
E.	Diagnostic Aids
The UPS shall be provided with the following built-in diagnostics for troubleshooting and circuit alignment aids:
1.	Rectifier in control mode 
2.	UPS synchronizing with critical load bus
3.	Positive DC bus ground fault 
4.	Negative DC bus ground fault
5.	Bypass frequency higher than system output frequency
6.	Bypass frequency lower than system output frequency
7.	Automatic static transfer switch lockout
8.	Command given to close inverter output circuit breaker
9.	Command given to close bypass circuit breaker
10.	Command given to open inverter output circuit breaker/bypass circuit breaker
11.	Degree of overload
12.	Undervoltage release for battery disconnect switch
13.	Undervoltage release for input circuit breaker
F.	
Site Monitoring Capability
UPS control circuits shall be capable of interfacing with Liebert SiteScan central site monitoring systems. Interface (proprietary RS-422 format) shall be built into the UPS. The site monitoring signal-processing module shall be built into the system logic. The following shall be available for display:
Metering
Bypass volts (line-line, all phases) 
Critical bus volts (line-line & line-neutral, all phases)
Critical bus current (all phases)
Critical bus frequency 
Critical bus kVA 
Critical bus kW 
DC volts 
Battery amps (+/-) 
% Capacity
Digital Alarms
Fuse Cleared			Load On Bypass		Battery Discharging
Output Overload		Static Switch Disabled		Control Power Failure
Emergency Power Off		Battery Disconnected		Low Battery Reserve
Ambient Over-temp		Module Cooling Failure		
G.	Remote Monitoring Capability
Remote Alarm Contacts 
A set of eight Form “C” remote alarm contacts, rated at 125V, 500mA, shall be provided, as an option, for customer use. These shall include:
Output CB Open		Control Failure
Battery CB Open		Ambient Over-temperature
Battery Discharging		Module Summary Alarm
Low Battery Warning		New Alarm
A set of eight Form “C” remote alarm contacts, rated at 24VDC, 1A shall be provided, as an option, for an optional Remote Alarm Panel. These shall include:
Load on UPS			Overload
Load on Bypass			Ambient Over-temperature
Battery Discharging		System Summary Alarm
Low Battery Warning		New Alarm

Auto-Dial
The UPS shall include an auto dial out feature as standard, capable of interfacing with an optional internal or customer supplied external, Hayes-compatible modem to report alarm and status information to a remote location. The modem control system shall have the capability to store two telephone numbers. In the event the system is unable to reach the first number, the second is attempted. This shall be accomplished automatically in the event of the occurrence of any of the following alarms:
Battery Discharging			Emergency Off
Low Battery Warning			Load on Bypass
Overload				Blower Failed
Ambient Over-temperature 		Battery Over-temperature
DC Ground Fault			Output Over-voltage
Battery CB Open			Overload Transfer
Battery Cycle Buffer Warning		Inverter Fault
DC Capacitor Fuse Blown		Equipment Over-temperature
Low Battery Shutdown			Input Current Unbalanced
DC Over-voltage Shutdown 		Static Switch Unable
Auto Transfer to Bypass 		Control Power Fail
Bypass Phase Sequence Wrong		Over-temperature Timeout
Output Over/under Frequency		Hardware Shutdown
Output Under-voltage			Rectifier Fuse Blown
Reverse Power
The UPS control communication circuits shall also download operational data for analysis, upon request from a local or remote terminal (RS-232-C format). Information available for display shall include all alarms and system parameters contained in the present status, event history, and history status files.
Customer Alarm Inputs
An optional Customer Alarm Interface terminal board, with a 24VDC, 100mA signal, shall be provided for the input and display of eight external, customer-provided alarm points, each with a customer-selected name of up to sixteen characters. The customer may also assign the following actions individually to each alarm:
Latch horn on and display alarm until manually reset
Include this alarm in the summary alarm
Freeze the history status file
Annunciate horn while alarm is present
Initiate modem auto-dial
Delay action from this alarm for 0 to 9999 seconds.
H.	Simultaneous Communications
Site monitoring, remote monitoring, and auto-dial communications as described above shall be available simultaneously.
2.3.6	
Battery Disconnect Breaker
The UPS shall have a properly rated circuit breaker (500 VDC) to isolate it from the battery. This breaker shall be in a separate NEMA-1 enclosure or in a matching battery cabinet. When open, there shall be no battery voltage in the UPS enclosure. The UPS shall automatically be disconnected from the battery by opening the breaker when the battery reaches the minimum discharge voltage level or when signaled by other control functions. The UPS shall be provided with a pushbutton to trip the breaker from the control panel. A maximum of three battery disconnect breakers with 48 VDC UVRs shall be connected to each UPS.
2.3.7	Battery Plant
Battery plant shall comply with the specifications of either
A.	Battery Power Pack,
B.	Flooded-Cell Battery System on rack, or
C.	Valve-Regulated, Sealed Cell Battery System on rack.
A.	Battery Power Pack
The battery power pack shall consist of sealed, valve-regulated batteries and a properly rated circuit breaker (500 VDC nominal, 600 VDC maximum) for isolating the battery pack from the UPS. The battery cells and disconnect breaker shall be installed and housed in a NEMA-1 cabinet, matching the UPS style and design, that attaches to the UPS module to form an integral system.
The battery system shall be sized to support a 180kW load for _____ minutes. The battery system shall provide 100% initial capacity upon delivery.
The battery shall be lead-calcium, sealed, valve-regulated type with a three (3) year full warranty and a seven (7) year pro rata warranty under full float operation. The battery design shall utilize absorbent glass mat (AGM) technology to immobilize the electrolyte.
B.	
Flooded-Cell Battery System on Rack
The battery shall be a lead-calcium stationary battery with a 20-year pro rata warranty under full float operation.
Ratings
Back-up Time: (   ) minutes.
Load kW: 180kW.
Maximum Specific Gravity: (   ).
Racks shall be (  )-tier, certified for seismic zone (  ).
Alloys
Grids shall be manufactured of calcium lead alloys to ensure long life and consistently low gassing rate over the entire service life; all internal wetted parts shall be of similar non-antimonial alloy to preclude interfacial corrosion at the bonded area.
Plates
Both positive and negative plates shall be of the flat pasted plate design to assure highly reliable electrical performance throughout the life of the battery. Positive plates shall be at least 0.16 in. (0.4cm) thick. Physical support of the positive plate group shall be via a suspension system which allows for normal plate expansion without stressing the jar or cover.
Terminals
All batteries larger than 1.5kW/cell (15 minute rate to 1.67 volts per cell) shall include copper inserted terminal posts allowing connector torque of 160 pound inches and copper-to-copper interface with the intercell connector (except for flashing). Terminal posts shall be of sufficient strength to support normal inter-tier or inter-step cabling without additional bracing.
Container
The cell cover shall be of a flame-retardant material with an oxygen index of at least 28; all jars must be transparent to allow visual inspection of the plates and sediment spaces. Cell covers shall include provision for sampling of the electrolyte below the tops of the plates.
Inter-Cell Connections
For each bolted connection, lead plated copper connectors and corrosion resistant bolts shall be provided; interconnecting hardware shall be sized so as to permit discharge at the maximum published rate while allowing no more than 30 mv of voltage drop between adjacent units at the one-minute rate to 1.75 volts per cell (VPC). Along with the necessary hardware, the supplier shall furnish NO-OX-ID grease to coat the contact area of all electrical connections.
Racks
Racks shall have welded steel support frames and unitized rail construction to prevent long-term warpage and resultant stresses on the cells and interconnections. All metallic rack components which directly contact the battery shall be insulated by removable covers.
Packaging
Must allow lifting straps to be inserted beneath the cells without moving, lifting or tilting the cells. Packaging shall assure that plates are oriented perpendicular to the normal direction of travel during transportation.
Manufacturing Controls
Each cell shall be clearly identified as to cell type, voltage, and capacity as well as manufacturing control group for future Quality Assurance traceability. All cells in the battery shall be tested to verify 100% system capacity. The equipment shall be designed and manufactured under a Quality Assurance Program which is controlled and documented by written policies, procedures or instruction, and which shall be carried out throughout the performance of the work. The Quality Assurance Program shall conform to the requirements of ANSI N45.2, MIL-I-45208A, and MIL-Q-9858.
C.	Valve-Regulated, Sealed Cell Battery System on Rack
The battery shall be a lead-calcium, sealed, reduced-maintenance type with a one-year full warranty and a nine-year pro rata warranty under full float operation.
Ratings
Back-up Time: (   ) minutes.
Load kW: 180kW.
Racks shall be (  )-tier, certified for seismic zone (  ).
Electrolyte Immobilization
Battery shall utilize absorbent glass mat (AGM) technology to immobilize electrolyte.
Alloys
Grids shall be manufactured of calcium lead alloys to assure long life and consistently low gassing rate over the entire service life; all internal wetted parts shall be of similar non-antimonial alloy to preclude interfacial corrosion at the bonded area.
Plates
Both positive and negative plates shall be of the flat pasted plate design to assure highly reliable electrical performance throughout the life of the battery. Positive plates shall be equipped with fibrous retention mats to inhibit the loss of active material as a result of repeated cycling.
Terminals
All batteries shall include copper inserted terminal posts allowing connector torque of 110 pound inches and copper-to-copper interface with the intercell connector (except for flashing). Terminal posts shall be of sufficient strength to support normal inter-tier or inter-step cabling without additional bracing.
Container
The cell container and cover shall be of a flame-retardant material with an oxygen index of at least 28. The cell cover shall include a low-pressure release vent. All cells larger than 0.25kW/cell (15 minute rate to 1.67 volts per cell) shall include an integral flash arrestor.
Inter-Cell Connections
For each bolted connection, lead-plated copper connectors and corrosion-resistant bolts shall be provided; interconnecting hardware shall be sized so as to permit discharge at the maximum published rate while allowing no more than 30 mv of voltage drop between adjacent units at the one-minute rate to 1.75 volts per cell (VPC). Along with the necessary hardware, the supplier shall furnish terminal connection coating compound if required by the battery manufacturer.
Manufacturing Controls
Each cell shall be clearly identified as to cell type, voltage, and capacity as well as manufacturing control group for future Quality Assurance traceability. All cells in the battery shall be tested to verify 100% system capacity. The equipment shall be designed and manufactured under a Quality Assurance Program which is controlled and documented by written policies, procedures or instructions, and which shall be carried out throughout the performance of the work. The Quality Assurance Program shall conform to the requirements of ANSI N45.2, MIL-I-45208A, and MIL-Q-9858.
2.3.8	
Optional Accessories
A.	7% Input Filter
The input filter shall reduce reflected input current distortion to less than 7% THD at full load. The input filter shall also improve the input power factor to better than 0.92 lagging at full load. The filter shall be installed inside the UPS module cabinet, not requiring any additional cabinet.
B.	Input Isolation Transformer
The all copper winding, dry power transformer (isolated winding type) shall isolate the AC line voltage from the battery, and shall have one tap 5% below rated voltage. When operating at full load and at maximum ambient temperature, the hottest spot winding temperature shall not exceed the temperature limit of the transformer insulation class of material. The transformer shall be designed for continuous operation at 125% full load with a non-linear 6-pulse rectifier. The transformer shall fit entirely inside the UPS module and not require an additional external cabinet.
C.	Matching Maintenance Bypass Cabinet
A make-before-break maintenance bypass shall be provided in a cabinet that matches and bolts up to the UPS. Installation of cabinet shall not affect cooling ability of UPS. Thermal-magnetic breakers shall be provided for maintenance bypass (MBB) and for maintenance isolation (MIB). Optional thermal-magnetic breakers shall be bypass isolation (BIB) and rectifier input (RIB). Each circuit breaker shall have an interrupting rating of 35 kAIC at 480 VAC and 65 kAIC at 208 VAC. An optional key interlock system shall be provided.
D.	Maintenance Bypass Panelboard or Switchboard
A make-before-break maintenance bypass shall be provided in a wall-mounted or floor-standing cabinet. Thermal-magnetic breakers shall be provided for maintenance bypass (MBB) and for maintenance isolation (MIB). Optional thermal-magnetic breakers shall be bypass isolation (BIB) and rectifier input (RIB). Each circuit breaker shall have an interrupting rating of 35 kAIC at 480 VAC and 65 kAIC at 208 VAC. An optional key interlock system shall be provided.
E.	Remote Alarm Panel
The remote alarm panel shall have LED alarm lights. An audible alarm shall sound upon any alarm condition. The surface- or flush-mounted NEMA 1 enclosed panel shall indicate:
1.	Load on UPS
2.	Load on Bypass 
3.	Battery Discharging
4.	Low Battery Warning
5.	Overload
6.	Ambient Overtemp
7.	System Summary Alarm
8.	New Alarm Condition - (For a Second UPS Alarm Condition)
Load on UPS			Overload
Load on Bypass			Ambient Over-temperature
Battery Discharging		System Summary Alarm
Low Battery Warning		New Alarm
F.	
Load Bus Synchronization
The Load Bus Sync™ (LBS) option is an add-on enhancement to the Uninterruptible Power Systems (UPSs). Its purpose is to ensure synchronous operation of two or more UPS systems, not necessarily all of the same manufacturer, during all steady state operating conditions. This includes times when the UPSs are operating on battery or independent generators, and situations when the bypass inputs are out of phase or sync.
There shall be two forms of LBS, Passive and Active.
Passive LBS – One UPS system is selected as the Master system, the remaining systems become Slave systems. During normal operation all systems shall function independently of each other. Should the UPS systems lose synchronization with each other for more than a pre-determined period of time then the slave UPS systems shall synchronize with the master system. Once quality and synchronization between the systems have been re-established for five seconds, the LBS will revert to separate synchronization for each system. Each UPS system synchronizing to its own bypass. There shall be no logic-level connections between UPS systems. This shall provide maximum independence between systems while retaining the ability to keep the systems in synchronization. Failure of any part of the LBS controls shall not cause system failure. The worse case effect of a failure in the LBS will be a failure of the UPS systems to synchronize with each other during times when the systems are not synchronized to utility power. Passive LBS may be used with a maximum of six UPS systems. LBS systems consisting of more than two UPS systems shall be called Extended Load Bus Sync (ELBS). 
Active LBS – In an Active LBS system the Slave UPS system is constantly tracking the Master UPS system.
G.	Power-Tie™ Equipment
The Liebert Power-Tie TM system provides the capability to momentarily or continuously parallel the output of two otherwise independent UPS systems. It also provides manually initiated, uninterrupted transfers of a critical load bus between the two UPS systems.
This topology permits one UPS and its associated distribution system to be shut down for maintenance while the load continues to be supplied by another UPS, without the necessity of transferring the load to bypass during shutdown or restart of the UPS being maintained.
Modes of Operation
The UPS system shall operate as an on-line reverse transfer system in the following modes:
1.	Normal: Each critical AC load bus is continuously powered by its respective multi-module UPS system. The rectifier/chargers of the UPS modules within each system derive power from the utility AC source and supply DC power to the inverters, while simultaneously float charging the batteries. The two UPS systems will be isolated from each other except as required by the optional Load Bus Sync Circuits. On-battery and bypass operation will be as described elsewhere in this specification for the individual UPS modules and systems.
2.	Maintenance Bypass with Momentary Power-Tie: If maintenance or repair is required on either UPS system, the critical load on that UPS system can be manually transferred to the other UPS system using the Power-Tie Control Cabinet without transferring to utility bypass. The Power-Tie Control system will ensure the breakers are operated in proper sequence. Once its load has been transferred, the UPS system to be maintained -- including UPS modules, System Control Cabinet, static switch, system output and bypass breakers -- can be totally isolated. After the maintenance or repairs are finished, the critical load shall be manually retransferred to the original UPS system without putting any portion of the critical load to bypass.
3.	Continuous Power-Tie: The Power-Tie controls shall permit the operator to continuously parallel the output of both UPS systems through the Tie Breaker. The control logic shall permit this tie operation without putting any portion of the critical load to bypass.
3.0	
EXECUTION
3.1	FIELD QUALITY CONTROL
The following inspections and test procedures shall be performed by factory-trained field service personnel during the UPS start-up.
3.1.1	Visual Inspection
1.	Inspect equipment for signs of damage.
2.	Verify installation per drawings supplied with installation manuals or submittal package.
3.	Inspect cabinets for foreign objects.
4.	Verify neutral and ground conductors are properly sized and configured per Liebert requirements as noted in Liebert drawings supplied with installation manuals or submittal package.
5.	Inspect electrolyte level in cells (flooded cells only).
6.	Inspect all cell cases.
7.	Inspect each cell for proper polarity.
8.	Verify all printed circuit boards are configured properly.
3.1.2	Mechanical Inspection
1.	Check all control wiring connections for tightness.
2.	Check all power wiring connections for tightness.
3.	Check all terminal screws, nuts, and/or spade lugs for tightness.
3.1.3	Electrical Inspection
1.	Check all fuses for continuity.
2.	Confirm input and bypass voltage and phase rotation is correct.
3.	Verify control transformer connections are correct for voltages being used.
4.	Assure connection and voltage of the battery string(s).
3.2	UNIT START-UP
1.	Energize control power.
2.	Perform control/logic checks and adjust to meet Liebert specification.
3.	Verify DC float and equalize voltage levels.
4.	Verify DC voltage clamp and overvoltage shutdown levels.
5.	Verify battery discharge, low battery warning and low battery shutdown levels.
6.	Verify fuse monitor alarms and system shutdown.
7.	Verify inverter voltages and regulation circuits.
8.	Verify inverter/bypass sync circuits and set overlap time.
9.	Perform manual transfers and returns.
10.	Simulate utility outage at no load.
11.	Verify proper recharge.
3.3	
MANUFACTURER'S FIELD SERVICE
3.3.1	Service Personnel
The UPS manufacturer shall directly employ a nationwide service organization, consisting of factory-trained field service personnel dedicated to the start-up and maintenance of UPS and power equipment.
The manufacturer shall provide a national dispatch center to coordinate field service personnel schedules. One toll-free number shall reach a qualified support person 24 hours/day, 7 days/week, 365 days/year. If emergency service is required, on-site response time shall be four hours or less within 150 miles of an LGS Service Center.
Two local customer engineers shall be assigned to the site with a regional office as a backup. Escalation procedures shall be in place to notify Power Technical Support if a site is not functioning within 24 hours.
3.3.2	Automated Site Monitoring
The UPS manufacturer shall provide as an option an automated site monitoring service. This service shall be staffed by a qualified support person 24 hours/day, 7 days/week, 365 days/year. At the detection of an alarm within the UPS, the controls shall initiate communications with the monitoring service. The monitoring service shall be capable of interpreting the communicated alarms to allow dispatch of a service engineer.
3.3.3	Replacement Parts Stocking
Parts shall be available through an extensive network to ensure around-the-clock parts availability throughout the country.
Spare parts shall be stocked by local field service personnel with back-up available from national parts center and the manufacturing location. A national parts center Customer Support Parts Coordinator shall be on-call 24 hours a day, 7 days a week, 365 days a year for immediate parts availability. 
3.3.4	Maintenance Contracts
A complete offering of preventive and full-service maintenance contracts for both the UPS system and battery system shall be available.