3500/42 Operation and Maintenance
Maintenance
179
To Input Peak to Peak Volts for Peak Units
5.1.9.7
Test OK Limits – Acceleration
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.
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 should cause a not
OK condition and cause the OK Relay to change state. 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 5.1.9.1
(Test Equipment and Software Setup - Acceleration).
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 Display screen reads OK.
6. Verify that the OK relay on the Rack Interface I/O Module indicates OK
(energized). See 3500/20 Rack Interface Module manual, part #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 on the
Verification screen 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.
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.
Input
Voltage
(V pp)
=
1
30.72
0.1
x 1 = 0.9207 V pp
/
.
282 84
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