CONTACTOR DRIVER

What does 1075 mean?

The motor controller (codes 1075, 2075, 3075) has detected a fault in the main contactor driver circuit. This affects the ability to control the main power contactor. The specific lift reaction is controller dependent.

• Contactor driver circuit open or shorted.
• Contactor coil fault (e.g., open circuit, short circuit).
• Internal controller hardware failure affecting the driver output.

Click steps to track your progress.

1. 1

   Verify the auxiliary control voltage supply to the motor controller's contactor driver circuit.

2. 2

   Inspect wiring and connections between the motor controller's contactor driver output and the main power contactor coil for damage, corrosion, or loose terminals.

3. 3

   Measure the resistance of the main power contactor coil to confirm it is within the manufacturer's specified range (check for open or short circuit).

4. 4

   Measure the voltage at the main power contactor coil terminals during a commanded activation attempt to verify the driver's output signal.