Maintenance
3500/42 Operation and Maintenance
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5.1.8.7
Test OK Limits - Velocity
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 OK relay to be
energized.
For Seismoprobes:
The general approach for testing OK limit is to disconnect the input. This will
cause a not OK condition and the OK Relay to change state (de-energize).
1. Run the Verification Software as described in Section 5.1.8.1 (Test
Equipment and Software Setup - Velocity).
2. Disconnect the SIG / A field wiring from the channel terminals on the
Proximitor / Seismic Monitor I/O Module.
3. Verify that the OK relay changes state (de-energized).
4. Verify that the Channel OK State line on the Verification screen reads not
OK.
5. Reconnect the SIG / A field wiring to the channel terminals on the Monitor I/O
Module. Press the RESET switch on the Rack Interface Module (RIM) and
verify that the OK LED comes on and the OK relay energizes.
6. Verify that the Channel OK State line on the Verification screen reads OK.
7. If you can not verify any configured OK limit, go to Section 5.1.11 (If a
Channel Fails a Verification Test).
8. Repeat steps 1 through 7 for all configured channels.
For Velomitors with Standard I/O Modules:
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 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 / B, COM, and SIG / A field wiring from the channel
terminals on the I/O module.
2. Connect test equipment and run software as described in Section 5.1.8.1
(Test Equipment and Software Setup - Velocity), page 152.
3. Bypass all other configured channels.
4. Adjust the power supply voltage to -7.00 Vdc.
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