I would like to thank jraef and ozmosis for their replys.
First jraef. The dc link bus bars which were removed were the solid copper bars which connected the pcb to the vfd terminals. These terminals were not used so the bus bars were removed as they provided an ideal path for flash-over...
I would put the contactor between the VFD and the motor with an auxilliary contact which starts the VFD when the contactor closes.
If it was a gate safety circuit I would have a key operated safety lock on the gate which would do two operations: a)open the VFD contactor instantly and b) initiate...
I've asked this question before, but I can't find it anywhere in the forums. I'll try again.
Has anyone experienced any problems with the Siemens G120 VFD's?
We have experienced flash overs between the dc link bus bars which destroys the main rectifier. When the faulty inverters are changed, we...
