Response of the new version:
The overvoltage monitoring function (OU) works as expected and does not respond to interference voltage peaks.
If the overvoltage monitoring function responds, the inverter is inhibited and the corresponding state change of the device state machine ('Fault') is always carried out.
What happens?
The overvoltage monitoring function (OU) responds to an overvoltage peak and inhibits the inverter so that the motor can no longer generate any torque (pulse inhibit). The device state machine remains unaffected and does not change to 'Fault'. In this way, the higher-level control system cannot identify the fault by means of the device state machine.
In the logbook, only an OU warning is registered.
When does this behaviour occur?
The behaviour occurs in the case of a short-time overvoltage (OU) in the DC bus caused by interference voltage peaks.
Which products are affected?
- i700 servo inverter
Short-term measures:
If necessary, the 'Warning' status bit can be queried by the control system to detect the above-described fault state.
Evaluation/recommendations:
Probability of occurrence: The described behaviour has only occurred very rarely in the field.
