Woodward TG-10E, Installation And Operation Manual

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Manual 04045 TG-10E/-13E/-17E Actuator
Woodward 29
12. Check electronic control output for proper voltage. Refer to the applicable
Woodward manual for troubleshooting the electronic control.
Use the troubleshooting chart (Table 6-1) on the next page to determine the
probable cause of faulty operation and to correct these troubles.
WARNING—OVERSPEED PROTECTION
The engine, turbine, or other type of prime mover should be equipped with
an overspeed shutdown device to protect against runaway or damage to the
prime mover with possible personal injury, loss of life, or property damage.
The overspeed shutdown device must be totally independent of the prime
mover control system. An overtemperature or overpressure shutdown
device may also be needed for safety, as appropriate.
Table 6-1. TG Actuator Troubleshooting
Symptoms Cause Correction
A. Low oil level Add oil to a level visible in the oil sight
glass.
B. Dirty oil Clean and back-flush cover filter in fuel oil
or kerosene. Change oil.
1. The turbine hunts or surges.
C. Binding terminal shaft linkage Align linkage as necessary.
A. Insufficient use of terminal shaft
travel Check linkage and readjust.
Recommended travel is 2/3 of maximum
actuator shaft travel from no load to full
load.
B. High steam valve gain Check that steam valve is not too large or
oversize for the particular application.
2. The actuator has difficulty in
accepting load, or is unstable as
evidenced by a slow and
unsteady oscillation especially
after a load change.
C. Dirt in actuator Drain, flush, and refill with fresh oil. Clean
cover filter.
3. The turbine cannot obtain rated
speed. A. Incorrect terminal shaft linkage
travel Check linkage. Recommended travel is 2/3
of maximum actuator shaft travel from no
load to full load.
A. Wrong actuator drive rotation Check turbine drive to the actuator.
Reverse pump parts for opposite direction
of rotation. See Chapter 3, Installation.
B. Key not properly installed or
missing; drive shaft is not engaged Remove actuator and properly install a No.
5 Woodruff key into actuator drive.
4. The actuator does not start or
control.
C. Incorrect control voltage Check electric control output for proper
voltage, and adjust. Check polarity.
A. Actuator oil too hot; oil viscosity
too low Use higher viscosity oil and/or an oil
cooler. See Chapter 3, Oil Supply. 5. Actuator does not provide rated
work capacity. Low oil pressure at
low speeds.
B. Improper speed range actuator Check actuator part number to verify
proper matching with turbine speed.
6. Erratic actuator control;
actuator may stick at maximum
fuel. A. Transducer assembly is not
tight See Woodward Service Bulletin number
50055 for transducer disassembly and
rework.