Maintenance and Troubleshooting
Chapter 5
58
C
CYCLE LINE POWER
TO SYSTEM POWER SUPPLY.
IS
PROCESSOR
INDICATOR
ON ?
REPLACE MINI–PLC–2/15
PROCESSOR. RELOAD
PROGRAM AND VERIFY
PROPER OPERATION.
RESTART CONTROLLER.
VERIFY PROPER OPERATION.
NO
YES
10141–I
2. Remove AC power from the Power Supply using the main disconnect.
3. Remove the I/O Power Cable from the Power Supply socket. To do this,
squeeze in on the side levers of the cable.
4. Restore AC power to the Power Supply and measure the voltages at the
Power Supply socket. if the voltages at the pins are less than specified in
Figure 5.2, remove system power and replace the Power Supply.
Follow these steps to measure the voltages at the end of the I/O Power Cable
that connects to the I/O Chassis.
1. Turn the Processor’s Mode Select Switch to the PROG mode. Support
Processor memory with an external battery pack (Figure 4–4) or with a
programmed EPROM in place. If not, be sure there is a copy of the
program on magnetic tape for convenient reloading.
2. Remove AC power from the Power Supply using the main disconnect.
3. Remove the Processor from the I/O Chassis.
4. Disconnect the I/o Power Cable from the I/O Chassis backplane.
5. Restore system power to the Power Supply.
6. Measure the voltages at the end of the I/O Power Cable. if the voltages are
incorrect, remove system power and replace the I/O Power Cable.
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