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Manual 04045
This chapter provides instructions for troubleshooting.
Poor governing may be due to faulty actuator performance, or it may be due to
the actuator attempting to correct for faulty operation of the turbine or the
equipment driven. The effect of any auxiliary equipment on the overall control
required of the actuator must be considered. Some actuator troubles can also be
related to control signal problems. Please refer to the appropriate manual for
troubleshooting information on the Woodward electronic control used with the TG
actuator.
WARNING—START-UP
Be prepared to make an emergency shutdown when starting the engine,
turbine, or other type of prime mover, to protect against runaway or
overspeed with possible personal injury, loss of life, or property damage.
Actuator troubles are usually revealed in speed variations of the turbine, but it
does not follow that all speed variations are caused by the actuator. When
improper speed variations appear, the following procedure should be performed:
1.
Check the load to be sure the speed changes are not the result of load
changes beyond the capacity of the turbine.
2.
Check the control valve for proper operation.
3.
Check the linkage between the actuator and the steam valve. There must
be no binding, no lost motion, and/or no inadequate travel.
4.
Make sure that the oil level is in the oil sight glass at operating temperature.
Remove the breather/filler cap and add oil if necessary (refer to Chapter 3,
Oil Supply).
5.
SHUT DOWN THE TURBINE.
6.
While the turbine is shut down, disconnect the control linkage between the
actuator and the control valve or fuel rack.
CAUTION—ACTUATOR DISCONNECTED
During this test, the actuator is disconnected from the turbine.
7.
Disconnect the leads from the actuator terminals. Hook up a circuit to the
actuator, as shown in Figure 6-1.
Woodward
Chapter 6.
Troubleshooting
Introduction
Visual Inspection
TG-10E/-13E/-17E Actuator
27
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