Woodward VariStroke-DX, Инструкция по установке и эксплуатации

Страница: 45 / 56

Manual 35132 VariStroke-DX Duplex Hydraulic Servo Skid
Woodward 43
Symptom Cause Recommended Action
Internal VS-GI oil
leakage Excessive wear or damage of valve Sleeve
seals.
Replace VS-I and Adjust Control System:
- Check for control signal instability. If control
signal is highly active reduce dynamic
settings at main control. Check wiring for
proper shielding or ground loops. Correct
these issues until the demand signal is
stable.
- Check for excessive drain pressure.
- Check for VS-I stability with stable demand
signal. If unstable, adjust dynamic settings
(see Customer Service Tool Manual).
- Reduce or eliminate dither setting in the
VS-GI and/or at the main control.
Large cylinder-
position
hysteresis
Abnormal high friction.
Adjust control dither in VS-GI
Clean or change power cylinder/ power
cylinder linkage.
Excessive input control noise.
Reduce or eliminate dither at turbine control.
Check wiring for ground loops.
Check for instability, reduce dynamic settings
at VS-I or main control.
Non-zero
pressure when
shut down
Drain pressure is too high. Reduce Drain pressure.
No switching
between units No health signal communication between
units
Check Wiring between units.
Non-Symmetric
Switching
performance
between units on
the same skid.
Contamination
Check the fluid for excessive contamination.
Replace or add a system filter ahead of the
VS-DX supply. Contact Woodward service.
Incorrect settings/calibration
Using Customer Service Tool perform the
recommended tuning procedure. Ensure both
units are set with the same dynamic settings.
Released