Maintenance
3500/42 Operation and Maintenance
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7. If the reading does not meet specifications, check that the input signal is
correct. If the monitor still does not meet specifications or fails any other part
of this test, go to Section 5.1.11 (If a Channel Fails a Verification Test).
8. Disconnect the power supply and multimeter and reconnect the PWR, COM,
and SIG field wiring to the channel terminals on the I/O module. Verify that
the OK LED comes on and the OK relay energizes. Press the RESET switch
on the Rack Interface Module (RIM) to reset the OK LED.
9. Repeat steps 1 through 8 for all configured channels.
5.1.7.4
Test OK Limits - Eccentricity
The general approach for testing OK limits is to input a DC voltage and adjust it
above the Upper OK limit and below the Lower OK limit. This will cause a
channel not OK condition and the OK Relay to change state (de-energize). The
Upper and Lower OK limits are displayed in the Verification screen on the test
computer.
1. Disconnect PWR, COM, and SIG field wiring from the channel terminals on
the I/O module.
2. Connect test equipment and run software as described in section 5.1.7.1
(Test Equipment and Software Setup - Eccentricity).
3. Bypass all other configured channels.
4. Adjust the power supply voltage to -7.00 Vdc.
5. Press the RESET switch on the Rack Interface Module (RIM). Verify that the
monitor OK LED is on and that the Channel OK State line in the Channel
Status box of the Verification screen reads OK.
Note
If the Danger Bypass has been activated, then the BYPASS LED will be on.
All other channels in the rack must be OK or bypassed for the relay to be
energized.
6. Verify that the OK relay on the Rack Interface I/O Module indicates OK
(energized). See 3500/20 Rack Interface Module Operation and
Maintenance Manual, part number 129768-01.
7. Increase the power supply voltage (more negative) until the OK LED just
goes off (upper limit). Verify that the Channel OK State line in the Channel
Status box reads not OK and that the OK Relay indicates not OK. Verify that
the Upper OK limit voltage displayed on the Verification screen is equal to or
more positive than the input voltage.
8. Decrease the power supply voltage (less negative) to -7.00 Vdc.
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