GE Bently Nevada 3300/25 Operation Manual page 41

3. Adjust the power supply voltage for -7.5 Vdc with respect to common.
4. Wait 30 seconds for the completion of the Timed OK/Channel Defeat delay, then
press the RESET switch on the System Monitor. Verify that the channel A OK LED is
on.
5. Decrease the power supply voltage (more positive) until the OK LED goes off (lower
limit). Verify that the lower OK limit is between -3.6 Vdc and -4.1 Vdc and that the OK
Relay changes states (de-energized).
Note: All other channels in the rack must be OK or bypassed in order for the
relay to change states.
6. Return the power supply voltage to -7.5 Vdc and verify that the OK LED comes back
on and the OK Relay energizes. If the not OK mode is latching it must be reset using
the RESET button on the System Monitor. If Timed OK/Channel Defeat is enabled, the
OK LED will be flashing when it comes on.
Section 14 - Test OK Limits
35