Dear Experts ,

I am working at a cement factory and i have a problem with a micromaster 440 , 200kW

This converter drives a induction motor 160kW installed on a dynamic separator application.

The converter is stopping  many times from alarm A0911 .it have alarm when it run down 45-39 , it run down have alarm two time 39 and 35 
Please Noted: No alarm when it run up 

On the converter is installed an braking unit type 6SE6440-2UD41-6GA1

P 700= 2

P1000=3

P 702=16

P 703=16

P1002=25Hz

P1003=50Hz

Please suggest smth to eliminate this alarm .

Best Regard 
Choun Chantha

Alarm A0911, is VDC max controller active. The drive is monitoring the DC link and extending the ramp down time to reduce the DC link Voltage created during the ramp down.

You have a braking unit and resistor connected, and enabled, P1237 = ???

Turn off/disable the Vdc Controller P1240 = 0.

This will allow the DC link Voltage to rise, enabling the braking resistor / module to control the DC link Voltage.

This is a 'separator' in a cement works, can you explain what type of machine / mechanism this is for the benefit of the the Forum, and myself.

Many thanks.

Tractor