Maintenance
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5.1.5.2
Test Alarms - Radial Vibration
The general approach for testing alarm setpoints is to simulate the vibration and
Keyphasor® signal with a function generator. The alarm levels are tested by
varying the vibration signal (both peak to peak amplitude and DC voltage bias)
and observing that the correct results are reported in the Verification screen on
the test computer. It is only necessary to test those alarm parameters that are
configured and being used. The general test procedure to verify current alarm
operation will include simulating a transducer input signal and varying this signal:
1. to exceed over Alert/Alarm 1 and Danger/Alarm 2 Setpoints, and
2. to drop below any under Alert/Alarm 1 and Danger/Alarm 2 Setpoints and
3. to produce a nonalarm condition.
When varying the signal from an alarm condition to a nonalarm condition, alarm
hysteresis must be considered. Adjust the signal well below the alarm setpoint
for the alarm to clear.
Direct
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 5.1.5.1
(Test Equipment and Software Setup - Radial Vibration).
3. Set the Keyphasor multiplier/divider so that the multiply setting is one and the
divide setting is one. Adjust the function generator amplitude to produce a
reading that is below the Direct setpoint levels on the Direct bar graph display
of the Verification screen.
4. Press the RESET switch on the Rack Interface Module (RIM). Verify that the
OK LED is on, the bar graph indicator for Direct is green, and the Current
Value field contains no alarm indication.
5. Adjust the function generator amplitude such that the signal just exceeds the
Direct Over Alert/Alarm 1 setpoint level. Wait for 2 or 3 seconds after the
alarm time delay expires and verify that the bar graph indicator for Direct
changes color from green to yellow and that the Current Value Field indicates
an Alarm.
6. Press the RESET switch on the Rack Interface Module (RIM). Verify that the
bar graph indicator for Direct remains yellow and that the Current Value Field
still indicates an Alarm.
7. Adjust the function generator amplitude such that the signal just exceeds the
Direct Over Danger/Alarm 2 setpoint level. Wait for 2 or 3 seconds after the
alarm time delay expires and verify that the bar graph indicator for Direct
changes color from yellow to red and that the Current Value Field indicates
an Alarm.
8. Press the RESET switch on the Rack Interface Module (RIM). Verify that the
bar graph indicator for Direct remains red and that the Current Value Field
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