INDUSTRIAL INDEXING SYSTEMS, INC. IB-11B012
MOTION CONTROL SYSTEM, MSC-250 USER'S GUIDE
AUGUST 1998 MAINTENANCE 4 - 9
11. Continue to turn the motor shaft in a counterclockwise direction. The voltage
should increase negatively to -10.0 VDC ±1 VDC. When the motor has been
turned 180 degrees from the starting point, the voltage will suddenly change
polarity to +10 VDC. As the motor continues turning in a counterclockwise
direction, the voltage will decrease toward 0.0 VDC. When the motor has been
turned 360 degrees (back to the starting point), the voltage should again be
0.0 VDC ±1 VDC. The cycle should repeat if the motor shaft continues to be
turned in a counterclockwise direction.
12. Turn off all power, remove all temporary jumpers, replace all disconnected wires,
and connect the command line connector to the controller.
13. Failure of the above test (as shown by incorrect voltages or no voltages)
indicates a problem in the position sensing circuitry (encoder, cable, or
controller).
Items to check if test fails:
a. Secure encoder connections.
b. Encoder reference and feedback signals.
c. Failed controller board.
d. Failed encoder.
e. Open or shorts in encoder cables.
f. 5 VDC Power Supply
4.2.2.3 Encoder Test
1. Remove controller and system power.
2. Open the controller cover and set the MODE selector switch to position 3.
3. Apply power to the controller.
4. Rotate the encoder (motor) slowly.
RESULT: The channel 1 and channel 2 encoder pulse LEDs should flash at the
same rate, but not at the same time. The channel 3 encoder pulse LED
should flash once per revolution.
Items to check if test fails:
a. Check that drive power is on for a shared encoder.
b. Make sure the feedback device connector is secure.
c. Check the cable for shorts.
d. Check the cable for breaks.
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