MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-508C 6 - 5
2. If any of the status LEDs are not green, go to Section 5 to
troubleshoot and correct the problem before proceeding.
3. Measure the bus voltages at the test jacks on the bus mon-
itor module. This test should be done with the system loaded.
4. Use a digital voltmeter to measure 5 VDC and ±15 VDC
with respect to DC common.
5. Measure 24 VDC with respect to I/O common using a volt-
meter.
6. The measured voltages should be within the specifications
under module voltage requirements in Table 1-4.
7. If the module bus voltages are not within specification, ver-
ify that the system is properly sized. Refer to Appendix B for
the power system sizing procedure.
Power Entry Panel Inspection and Check
This procedure applies to IEPEP04 power entry panel. The sys-
tem must be shut down to perform this maintenance task.
NOTE:
Removal of the power entry panel may require two people.
1. Turn off power at the external circuit breakers that feed
power to the power entry panel.
2. Use the 4-inch screwdriver to disconnect all wires and
cables from the rear of the power entry panel. Label the wires
according to their terminal assignments.
3. Use the 16-inch flathead screwdriver to remove the
4 screws (2 on each side) that hold the power entry panel in
position.
4. Remove the power entry panel by sliding it out the back of
the cabinet.
5. Remove the top cover from the power entry panel by remov-
ing the 3 screws securing it at the rear of the power entry
panel.
6. Check the tightness of all power wiring screws within the
power entry panel. Torque all No. 6 screws to 0.90 Nm (8
in-lbs). Torque all No. 8 screws to 1.58 Nm (14 in-lbs).
7. Inspect and clean the power entry panel, DC transfer mod-
ule and bus monitor module.
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