
3500/42 Operation and Maintenance
Maintenance
127
Verification Screen Setup - Thrust Position and Differential Expansion
Run the Rack Configuration Software on the test computer. Choose Verification
from the Utilities menu and choose the proper Slot number and Channel number
then click on the Verify button.
The following table directs you to the starting page of each maintenance section
associated with the Thrust Position and Differential Expansion Channels.
Section
Number
Topic
Page
Number
5.1.6.2
Test Alarms - Direct
127
5.1.6.2
Test Alarms - Gap
128
5.1.6.3
Verify Channel Values - Direct
129
5.1.6.3
Verify Channel Values - Gap
132
5.1.6.4
Test OK Limits
132
5.1.6.2
Test Alarms - Thrust Position and Differential Expansion
The general approach for testing alarm setpoints is to simulate the Thrust
Position and Differential Expansion signal with a power supply. The alarm levels
are tested by varying the DC voltage 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.
2.
to drop below any under Alert/Alarm 1 and Danger/Alarm 2 Setpoints.
3.
to produce a nonalarm condition.
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 5.1.6.1
(Test Equipment and Software Setup - Thrust Position and Differential
Expansion).
3. Adjust the power supply to produce a voltage that is within 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 has no alarm indication.
5. Adjust the power supply voltage such that the signal just exceeds the Direct
Over Alert/Alarm 1 setpoint level. Wait for 2 or 3 seconds after the alarm
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