Siemens Micromaster 420 or MM420 Drive
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Jun 09, 2022 5:46 am
A0910 alarm in siemens micromaster 420 or MM420 drive - comes when Vdc max controller was de-activated, as it was not able to keep the DC link voltage within the limit values.
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Jun 09, 2022 5:47 am
Cause : Comes when Vdc max controller was de-activated, as it was not able to keep the DC link voltage within the limit values.
1. if the line supply voltage is permanently too high.
2. if the motor is driven by an active load, which means that the motor goes into regenerative operation.
3. while decelerating (short down-ramps P1121) for extremely high load torques
Please check the following:
1. is the input voltage (P0756) within the permissible range ?
2. are load duty cycle and load limits within the permissible limits
