Forum

Notifications
Clear all

A0502 Overvoltage limit alarm in siemens micromaster 420 or MM420 drive

2 Posts
1 Users
0 Likes
141 Views
Posts: 5095
Admin
Topic starter
(@click2electro)
Member
Joined: 2 years ago

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

Topic Tags
1 Reply
Posts: 5095
Admin
Topic starter
(@click2electro)
Member
Joined: 2 years ago

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) ?

1. Check that mains supply voltage is within allowable range
2. Increase ramp down times

Reply
Share: