IB-11B012 INDUSTRIAL INDEXING SYSTEMS, INC.
USER'S GUIDE MOTION CONTROL SYSTEM, MSC-250
4 - 8 MAINTENANCE AUGUST 1998
4.2.2.2 Position Loop Test
NOTE
The Position Loop Test assumes a 1024 line encoder.
The position loop test is used to verify that the MSC-250 controller and encoder are
functioning properly. The controller and encoder are placed in a condition where the
encoder signals are fed back to the controller. As the encoder is rotated, a corresponding
voltage can be measured at the test points on the controller.
1. Remove controller and system power.
2. Open the controller cover and set the MODE selector switch to position 2.
3. Remove the 6-Pin command line connector, for the axis to be tested, from the
controller.
4. Restore power to the controller and system.
WARNING
THE COMMAND LINE CONNECTOR MUST BE DISCONNECTED
FROM THE CONTROLLER TO MAKE SURE THE DRIVE DOES NOT
BECOME ENABLED.
5. Connect a DC volt meter to the appropriate test points on the MSC-250
controller. Connect the positive meter lead to the POS OUT test point and the
negative meter lead to the GND test point.
NOTE
Full scale voltage for this test should not exceed ±10 VDC.
6. Apply system power.
7. Manually turn the motor shaft until the meter reading is 0.0 VDC ±0.1 VDC.
8. Turn the motor shaft 1/4 turn clockwise. The volt meter should indicate a voltage
of +5 VDC ±1 VDC.
9. Turn the motor shaft back to the starting point. The volt meter should indicate
0.0 VDC ±0.1 VDC.
10. Turn the motor shaft 1/4 turn counterclockwise. The volt meter should indicate a
voltage of -5 VDC ±1 VDC.
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