Steve Bailey
Lifetime Supporting Member + Moderator
New machine commissioning with two Power Flex drives, one 3 HP, one 0.5 HP. The 0.5 HP works fine. The 3 HP powers up OK, but displays fault code 13 as soon as you try to run it. The Quick start booklet that came with the drive identifies code 13 as a ground fault. The same Power Flex connected to the other motor works OK. The machine's owner reported today:
If the motor is disconnected from the machine, laying on the floor, only the 3 power lines attached, it runs fine. Both jog and run modes.
Bolted to machine, no coupling attached, able to turn armature with fan freely, absolutely no internal interference, get fault code on VFD.
Again, laying on floor, but with ground wire run from motor case to machine, get same fault code.
Laying on floor, no ground wire, running, check for voltage between motor case and machine, read 164 VAC. ????????
Dissemble motor on bench, repeatedly, visually check for any damage to windings or anything unusual. Every thing appears perfect.
Is this motor toast?
If the motor is disconnected from the machine, laying on the floor, only the 3 power lines attached, it runs fine. Both jog and run modes.
Bolted to machine, no coupling attached, able to turn armature with fan freely, absolutely no internal interference, get fault code on VFD.
Again, laying on floor, but with ground wire run from motor case to machine, get same fault code.
Laying on floor, no ground wire, running, check for voltage between motor case and machine, read 164 VAC. ????????
Dissemble motor on bench, repeatedly, visually check for any damage to windings or anything unusual. Every thing appears perfect.
Is this motor toast?