Hello,

Is there anyone who has faced such problem. There is G150 drive in extruder motor application. During production running motor RPM suddenly drops down from 600 to 30 RPM without any alarm or fault on VFD, and it continues to run at 30 RPM until it is stopped manually. After restarting the VFD runs just normal until such random problem repeats. This problem occurs 2-3 times in a week.
As VFD is not showing any alarm or fault, it is difficult to diagnose this problem. 

Hello,

Which is operating mode? V/F or vector? i.e. p1300 = ?

Does motor has encoder for speed feedback?

Does motor current & torque limits are correct?

Please check above.

It is Speed Control with Encoder, p1300 = 21

Yes , the motor has encoder for speed feedback.

Everything is correctly set, the drive is working fine since last 8 yrs after commissioning and nothing has changed then after. 

Hello,

did you check speed setpoint?

Has it also drop down or it is stable?

With regards

Martin