Q: Siemens MM440 inverter controls the fan motor running. When an undervoltage occurs, the inverter will report the fault stop. Now I want to add a plc control logic. When the inverter fails, it will automatically reset the fault and then restart the inverter automatically. Can this logic control be implemented?
Answer: 1. Just set the parameter P1210.
P1210 is used to configure the function to allow the inverter to restart automatically after the main power trip or after a fault occurs.
2. About P1210 -
P1210=1:
The inverter acknowledges (resets) the fault, ie resets the fault when the drive is powered back on. That is to say, the inverter must be completely powered off, and only 'power blanking' is not enough. The drive will not run until the ON command is re-triggered.
P1210=2:
When power is restored after the 'power interruption', the inverter acknowledges fault F0003 (undervoltage) and restarts. In this case, an ON command is required to be added to the digital input (DIN).
P1210=3:
The starting point for this setup is that it can only be restarted if the drive is already in the "RUN" state in the event of a fault (F0003, etc.). The drive will acknowledge (reset) the fault and restart after “power interruption†or “power blankingâ€. In this case, an ON command is required to be added to the digital input (DIN).
P1210=4:
The starting point for this setup is that the drive can only be restarted if it is in the "RUN" state when a fault occurs (F0003, etc.). The drive will acknowledge the fault and restart after “power interruption†or “power blankingâ€. In this case, an ON command is required to be added to the digital input (DIN).
P1210=5:
When the power is turned back on after the "power interruption", the inverter confirms the fault such as F0003 and restarts. In this case, an ON command is required to be added to the digital input (DIN).
P1210=6:
When power is restored after "power interruption" or "power blanking", the inverter confirms the fault such as F0003 and restarts. In this case, an ON command is required to be added to the digital input (DIN). When P1210 is set to 6, the motor restarts immediately.
3. Note: 'Automatic restart' can only be performed when the ON command remains unchanged on a digital input.
4. When changing P1210, P1200 should be changed together.
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