VACC NOT OK

What does 1078 mean?

The motor controller (codes 1078, 2078, 3078) has detected that the accessory voltage (VACC) is not within acceptable limits. This indicates a problem with the auxiliary power supply. The specific lift reaction is controller dependent.

• Auxiliary power supply fault (e.g., overvoltage, undervoltage).
• Short circuit on an accessory output drawing excessive current.
• Internal power supply regulation fault within the controller.

Click steps to track your progress.

1. 1

   Verify the main input voltage supply to the auxiliary power supply unit for proper phase and magnitude.

2. 2

   Measure the VACC output voltage from the auxiliary power supply at the motor controller's VACC input terminals.

3. 3

   Inspect all wiring and connections between the auxiliary power supply unit and the motor controller for damage, looseness, or corrosion.

4. 4

   Check relevant diagnostic parameters within the Kone elevator control system for any additional fault details or specific VACC threshold settings.