Motors tripped by under voltage in Siemens simocode 2

[SA07]

Hi
We are a power plant exporting to the utility grid. Since our power plant start operation, we had several power plant trips due to motor tripping by under voltage in Siemens Simocode. We contacted Siemens. They requested to lower the settings. But still same problem. After a discrimination study, the settings are now 160V 25.5s on some motors. Previously it was 176 V 4 s. A few days back we had a power plant trip due to under voltage following a capacitor explosion.

The motors may trip following a fault on the utility network whenever there is a voltage drop.

As a test can we disable this UV protection in the simocode? Is there a risk that the motors may burn?

Has any one encountered same problem with UV in Siemens Simocode.

Typical motor ratings are 110 kW, 132kW, 350 kW, 400 kW. Voltage 690 Vac

Thanks

 

[jraef]

Soooo... the previous conversation didn't happen then?


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

 

[SA07]

It did happen. We want solutions to prevent this from happening again.