What this code means

This fault is displayed when the controller detects an overvoltage or undervoltage condition. Overvoltage threshold is 35V, undervoltage threshold is 9,5V in the 24V controller. In 48V controller overvoltage threshold is 65V, undervoltage threshold is 9,5V.

Applies to: ZAPI ACE0 / COMBIAC0 controller.

Possible causes / checks (from the source)

of fault displayed at startup or in standby; in these cases it is very likely the fault is due to an undervoltage, so it is suggested to check: A) Key input signal down-going pulses (below undervoltage threshold) due to external loads, like DC/DC converters starting-up, relais or contactor switching, solenoids energizing / deenergizing. B) If no voltage transient is detected on the supply line and the alarm is present every time the key is switched ON, the failure is probably in the controller hardware, so it is necessary to replace the controller. Troubleshooting of fault displayed during motor driving; in this case it can be an undervoltage or a overvoltage condition. A) If the alarm happe

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