9907-018 Woodward Forward Acting Speed Control

Description:

These controls are available for forward- or reverse-acting applications, and for
use with either single or tandem actuators. Models for three different actuator
current ranges are available, as well as a high-voltage model (90 to 150 Vdc or
88 to 132 Vac, 45 to 440 Hz), and a low-voltage model (20 to 40 Vdc). The high
voltage model is identified as such on the front; the low voltage model is not.
In reverse-acting systems, the actuator calls for more fuel when the actuator
voltage decreases. Complete loss of voltage to the actuator will drive the actuator
to full fuel. This allows a backup mechanical ballhead governor to take control
rather than shut down the prime mover as would a direct-acting system.
An optional deceleration ramp is also offered. When this option is present, the
time to ramp from rated speed to idle speed is approximately 20 seconds. If this
option is not present, this happens instantly.
Tables 1-1 and 1-2 show part numbers and features of all 9905/9907 series
2301A load sharing and speed controls.