Hello,

Which is controller?

From the attached snaps these are 611D drive. 

Please check drive enable & pulse enable signals of infeed module which will help to find out the reason of problem in powering drive module.

Moreover P600 & N600 terminals of power infeed are connected to DC bus. As such request you to check infeed module ready signal which might be getting release after voltage limiter value. So check the OEM trouble shooting/maintenance manual. 

 Suggest you disconnect E/R module from other modules, test it , to see its function 

Dovi3D

There is no DC power coming from the P600,N600 terminals. Well, there is.. but only from condesators that are still uncharged. When machine is turned off and turned right back on, Input voltage u1,v1,w1 to simodrive611 is present. But P600,N600 terminals only show a dropping voltage from the condensators. 

When voltage between P600 and N600 terminals drops below ~50VDC when switching the main supply on machine starts up normally.  

If its over 50 vdc, no power comes to P600,N600 just a decreasing voltage reading

When measuring in this scenario, drive enable 0 volts, pulse enable 0 volts, ready signal 0 volts

 so please use without surge limiter 

Dovi3D

Tried disconnecting the e/r module from other modules, still the same problem remained. Only disconnection from surge limiter "fixes"the problem

Dovi3D

Tried disconnecting the e/r module from other modules, still the same problem remained. Only disconnection from surge limiter "fixes"the problem

 Hello,

It looks like Capacitors or resistors of surge limiter are malfunctioning i.e. capacitors due to aging looses its die-electric property, more ripples or resistors connected in capacitor circuit malfunction which would create such problem. I suggest you to replace surge limiter so that E/R module life can be improved.

Hope this helps.