Woodward VariStroke-I, Product Manual, Page: 80 / 88

Manual 26727 VariStroke-I (VS-I) Electro-hydraulic Actuator
Woodward 78
Advanced Configuration
Advanced Configuration Page
Figure 6-3. Advanced Configuration Screen
Bandwidth : Adjusts how fast the actuator will respond to a demand input change. The higher the setting
adjusted, the faster the actuator will respond, but the more sensitive it will be to electrical noise on the
demand signal.
Dither : Typically used if the actuator is connected to a pilot valve to overcome sticky pilot valve action.
The higher the setting, the higher the output shaft is oscillating amplitude.
It is recommended that the Dither function NOT be used unless it is
deemed absolutely necessary. Excessive dither will result in
accelerated wear.
Silt Buster : The Silt Buster routine can be used to flush out any trapped silt/dirt on a daily, weekly, or
monthly basis. This setting is typically used in applications where the actuator may be held in one position
for long periods, allowing silt/dirt to become trapped within the servo valve.
Released