9 years ago
Lathe is an AW-100, sort of like an Omniturn. Been running great for years
It has a 220V, 3-phase, 5hp Baldor spindle motor that is driven by a Yaskaw
a (EMS) 606 PC3 VFD.
This old VFD just has status indicating llights, not the LED status/program
Here's my problem:
Starting today, the motor runs fine, no load, but only for a minute or less
, and then the Control & VFD alarm out with a spindle fault. On the VFD it
shows a Over/Under Voltage fault light, stopping the motor.
With the motor not even running, the VFD randomly "clicks" and the OV/UV al
arm briefly flashes red, then status goes back to normal (flashing green).
Seems the VFD is Intermittently OV/UV faulting at a once every 10 to 60-sec
So far I've checked:
Line voltage checked at 212-214V across each of 3 legs, and OK from wall in
to and out of machine's main power switch.
All other 3-phase machines running normally in the shop. Good commercial 3
-Phase power, not running an RPC.
From the main switch, power goes to an AB Electromagnetic contactor. The E
M contactor's voltage checked OK in/out, as far as i can tell, but that cou
ld certainly still be at fault intermittently. Need a way to monitor Volta
ge changes as the fault occurs I guess.
AC Volts into lugs on VFD input read same as at the wall and EM contactor o
n all 3 legs.
I have no DC experience and have not checked that.
Have not checked output voltage of VFD.
Any thing else that I can check?
Does this sound like a VFD problem, or should I be looking for something el
se in the power system's input to the VFD?
Am not really much of an electrical expert here.
Any insights or advice will be much appreciated.