IB-11B012 INDUSTRIAL INDEXING SYSTEMS, INC.
USER'S GUIDE MOTION CONTROL SYSTEM, MSC-250
4 - 4 MAINTENANCE AUGUST 1998
4.2 TROUBLESHOOTING
The balance of this section is designed to assist trained personnel in identifying and
correcting controller malfunctions. A prerequisite to the use of this troubleshooting guide is
a thorough knowledge of the MSC-250 controller. When a problem occurs, first read the
appropriate sections of this manual to make sure that the controller is installed properly and
that it is being operated correctly.
CAUTION
WHEN ALL TROUBLESHOOTING FUNCTIONS ARE COMPLETED, MAKE
SURE THE MODE SWITCH IS RETURNED TO THE 0 POSITION FOR
NORMAL CONTROLLER OPERATION.
4.2.1 BASIC SYSTEM CHECKS
Most problems with the controller can be found by following a systematic sequence of
observations and tests. Many start-up problems can be associated with improperly
installed devices, loose or improper wiring connections, or improper settings.
All troubleshooting should include an initial check of various basic areas. For the MSC-250
controller, some of the areas to be checked include the following:
5. If this is an initial installation, check all installation procedures to make sure they
have been followed properly.
6. Check to make sure 120 VAC power is being supplied to the controller and all
system power supplies. Check to make sure plugs are securely inserted in their
respective sockets and supply disconnects are turned on. Check all fuses.
7. Check the status displays to see if an error message is being displayed. Take
appropriate corrective actions if an error message is displayed.
8. Check for loose or broken wires.
9. Check all serial and peripheral cable connectors to make sure they are securely
seated in their respective sockets.
10. Check all input devices for proper settings.
11. Check for a loose mechanical coupling between the motor and the encoder.
12. Check each of the test points on the controller circuit board for the correct voltages
(refer to Figure 4.3).
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