PEM Cooling Fan (1.5)

The Power Electronics Modules (PEM) in a 1.5 series Tesla Roadster relies on a dual 12 Volt DC brush motor squirrel cage fans to cool IGBT (Power Transistor) heat sinks, to maintain safe operating temperatures in the power output section of the inverter, and the drive motor. One in the fans is in the PEM, and one mounted below, to cool the drive motor.

These SPAL brand fan assemblies are a fairly low tech device, equipped with brushes that wear down, shaft bearings that wear, and no built-in tachometer often inserted in more critical cooling fans.

Roadster firmware relies on current sensing to gauge fan operation, and as this part wears, it begins to operate outside expected current thresholds, eventually throwing PEM cooling errors.

(There are other conditions that can cause PEM cooling errors – failure to perform routine PEM cleaning)

We recommend replacement of both of these vital cooling portions of the Roadster drive train every 5 years.

Call our Tech Support hotline for details or installation/replacement assistance – 623-433-8500


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