5503-302D WOODWARD

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.

External wiring connections for reverse-acting controls are identical 

to those for direct-acting controls.

The relationship between prime mover speed and sensor output frequency is 

expressed in the formula:

Sensor Frequency in Hz equals the number of teeth on the speed 

sensing gear times the rated prime mover speed in revolutions per 

minute divided by 60.

Application engineers from Woodward or any of its authorized distributors or 

agents are always available to assist you in selection of the correct control for 

your system, or to answer questions concerning control installation, operation, or 

calibration. See Chapter 6 for contact information.