3500/42 Operation and Maintenance
Maintenance
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5.1.6
Thrust Position and Differential Expansion Channels
The following sections describe how to test alarms, verify channels, and test OK
limits for channels configured as Thrust Position and Differential Expansion. The
output values and alarm setpoints are verified by varying the input DC voltage
from a power supply and observing that the correct results are reported in the
Verification screen on the test computer.
Thrust Position and Differential Expansion channels can be configured for the
following channel values and alarms:
Channel Values
Alarms
Over
Under
Direct
X
X
Gap
X
X
5.1.6.1
Test Equipment and Software Setup - Thrust Position and Differential
Expansion
The following test equipment and software setup can be used as the initial setup
needed for all the Thrust Position and Differential Expansion channel verification
procedures (Test Alarms, Verify Channels, and Test OK Limits).
WARNING
Application Alert
High voltage present.
Contact could cause
shock, burns, or death.
Do not touch exposed
wires or terminals.
Tests will exceed alarm
setpoint levels causing
alarms to activate. This
could result in a relay
contact state change.
Application Alert
Disconnecting field
wiring will cause a not
OK condition.
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