Maintenance
3500/42 Operation and Maintenance
166
supply the buffered outputs on the front panel will be inverted in phase and will
have a different DC voltage than the input. This will not affect the actual vibration
readings in the Monitor.
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, COM / A, and SIG / B 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 154.
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 section of the Verification screen reads OK.
6. Verify that the OK relay on the Rack Interface I/O Module indicates OK
(energized). See the 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 (lower limit due to the inversion on the I/O Module). Verify that the
Channel OK State line on the Verification screen reads not OK and that the
OK Relay indicates not OK. Verify that the Lower OK limit voltage displayed
on the Verification screen is equal to or more negative than the following
value.
8. Decrease the power supply voltage (less negative) to -7.00 Vdc.
9. Press the RESET switch on the Rack Interface Module (RIM). Verify that the
OK LED comes back on and the OK relay energizes. Verify that the Channel
OK State line in the Channel Status section reads OK.
L o w e r O K
L im it V o lta g e
- 2 0 .8 4
-
V in p u t
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