© copyright 1995 by
Powertec Industrial Motors
Page 8-3
5. Three of the firing circuits can be checked even with the current
limit set at zero by turning the motor shaft by hand and verifying the follow-
ing LEDs turn on as follows:
LED1, then LED2, then LED3. There should be only one of these
LEDs on at any point in the rotation. If any LED stays on all the time while
rotating the motor, or if any LED stays off all the time while rotating the
motor, something is wrong (probably with the driver board or connections to
it). Call the factory for assistance. Note that LEDs 4, 5, and 6 will not turn on
since the current limit is turned to zero and the pulse width modulation of the
lower three transistors cannot take place.
6. Check for proper feedback operation and connection by setting the
speed reference to zero and the current limit to about 15% (slot horizontal).
Turn the motor shaft in both directions. In one direction, with the reference at
zero, the current limit LED should go out. If it does not, there is a possibility
there is something causing one or both of the feedback channels to be lost
and the motor could accelerate to full speed if the current limits were turned
up further.
Note: Remove the ramp stop jumper on the speed regulator board
before proceeding. If this jumper is in place it may cause problems with the
startup procedure. It can be reinstalled later. When any of the jumpers is
removed, it can be “stored” by plugging it back on onto just one pin.
1. If the machine requires nearly full rated torque to run with no
product on it and cannot be unloaded to run at 25% torque, then the motor
should be uncoupled before continuing.
2. With just the power turned on, but not yet in a run condition, the
LEDs should have the following status:
Current Regulator Board
power on green
OV/UV out
PH out
IOC out
bus (after charge up) green
enable out
tach loss out
phase advance (if installed) out
Speed Regulator Board
run out
current limit out
zero speed out
Current Sensor Board
bus charged yellow
temp OK green
LED3 (current cal indicator) out
ELECTRICAL TEST
WITH MOTOR
RUNNING
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