A0502 Overvoltage limit alarm in siemens micromaster 420 or MM420 drive

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 How can resolve problem A0502 Overvoltage limit alarm in siemens micromaster 420 or MM420 drive ?

Cause : Overvoltage limit Value.

- the overvoltage limit value has been reached (actual value of the DC link voltage r0026 greater than r1242).

Diagnosis & Remedy

- if this alarm is permanently displayed, check the inverter input voltage.
- is the DC link voltage controller (Vdc_max controller) de-activated (refer to parameter P1240) ?
- short ramp times and/or large flywheel masses (moment of inertia) ?

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