USER'S GUIDE ____________________________________________________________________
96 __________________________________________________________________ M210543EN-F
5. Check that PWD22/52 has power by opening the PWC22/52
electronics enclosure cover and checking that the Run and
Signal/Offset LEDs are blinking.
6. If no LED is on:
- Check the power supply voltage.
- Check that all the connectors are properly inserted.
- Check the power cable and connections.
7. If the Run LED is blinking (once per second for correct operation):
- Connect a maintenance terminal to the RS port.
- Check steps 1 and 2.
- Try resetting by turning the power off/on.
8. If the Run LED is lit:
- Try resetting as above.
- If the state is continues, it is probably caused by either the
program memory or CPU fault.
Message Exists but Visibility Value Does
Not
1. PWD22/52 control electronics is probably working.
- Check the status information with the STA command (see
section STA on page 75). If there are any active alarms, the
visibility value does not exist.
- Check P12, M12, BACKSCATTER and LEDI. See Appendix
A, Internal Monitoring, on page 105 for internal monitoring
values of the limits.
2. Go to the PWD22/52 site.
- Check the cable connectors.
- Check the receiver and transmitter units. Follow the instructions
in section Removing and Replacing Optical Units on page 88
when removing the units.
- Visually inspect the condition of the electronics.
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