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Manual 82450
This chapter provides instructions for troubleshooting and preventive maintenance of the TM-25LP and
TM-200LP actuators.
The service life of the actuator is increased with the use of clean supply flow. However, contaminant
resistance of the actuator is excellent due to design features and high working forces.
The actuators are equipped with a 40 µm nominal/ 70 µm absolute filter fitting at the supply connection.
See the outline drawing (Figure 2-1) for the location of the fitting. If the filter becomes clogged, as
evidenced by sluggish response of the actuator, it may be removed, cleaned ultrasonically, and back
flushed with a light solvent. Be prepared to replace the O-ring (part 80, Figure 6-1) after cleaning the filter
(part 79, Figure 6-1). Re-torque the inlet filter fitting to 17.0 ± 0.6 Nm
(150 ± 5 lb-in), and re-safety.
Malfunctions of the governing system are usually revealed as speed variations of the prime mover, but it
does not necessarily mean that such speed variations indicate governing system problems. When
improper speed variations appear, inspect all components, including the turbine, for proper operation.
See the correct Woodward manual for assistance in isolating the trouble.
The following steps describe troubleshooting the actuator:
1. If, during the starting sequence, the actuator does not respond to electric control input, check the
actuator pressure supply and supply link.
2. If the actuator does not respond to electric input, disconnect the output linkage and attach a power
supply and millimeter. Increase current to the actuator, and the output should follow smoothly with
increasing current. DO NOT exceed 250 mA.
Disassembly of the actuator in the field is not recommended. Under unusual circumstances where field
repair becomes necessary, all work and calibration should be done by personnel thoroughly trained in the
proper procedures.
Refer to Chapter 7 for instructions on contacting a Woodward Service Representative or for training on
this product.
Woodward
Chapter 5.
Maintenance
Introduction
EXPLOSION HAZARD—Do not remove covers or connect/disconnect
electrical connectors unless power has been switched off or the area
is known to be non-hazardous.
Substitution of components may impair suitability for Class I,
Division 1 or Division 2, and Zone 1 or Zone 2 applications.
Filter Cleaning
Do not run the actuator with the inlet filter fitting or the in-line filter
removed or bypassed, as extensive repairs can be made necessary
by only momentary exposure of the interior of the torque motor to
contaminants.
Troubleshooting
TM-25LP, TM-200LP Actuators
21
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