Be prepared to make an emergency shutdown when starting the engine, turbine, or other type of prime mover, to protect against runaway or overspeed with possible personal injury, loss of life, or property damage.
Speed Trim
A speed trim potentiometer or digital reference unit is connected to terminals 11
and 12. Use a high quality 100 W, 10-turn potentiometer (Woodward part 1657-
537 or equivalent) to provide about ±5% speed adjustment. Terminals 11 and 12
must be jumpered if the speed trim potentiometer or digital reference unit is not
used. The 2301A Speed Control will have a jumper installed in the factory and
this must be removed if a speed-trim device is used.
Droop Potentiometer
A 2K potentiometer may be connected to provide a maximum of about 8% droop.
Connect the potentiometer (ccw) to terminal 15, (cw) to terminal 14, and wiper to
terminal 13. If droop is not desired make no connections to terminals 13 and 14.
Switch Options
Minimum Fuel Contact
The minimum-fuel contact between terminals 2 and 3 on the low-power models
and 3 and 6 on the high-power models is intended as an optional means for a
normal shutdown of the prime mover. The contact is connected as shown on the
plant wiring diagram for the particular control. If a minimum fuel contact is not
used, the terminals must be permanently jumpered.
Do NOT use the minimum-fuel contact as a part of any emergency
stop sequence. The emergency may be caused by a governor
malfunction which would also cause a malfunction of the minimumfuel feature. Use of the minimum-fuel contact for an emergency stop
sequence could cause overspeed of the prime mover and mechanical
damage and personal injury, including death.
Failed Speed Signal Override
Circuits in the 2301A Speed Control constantly monitor the signal from the MPU.
Should this signal be below a minimum threshold the control sends a minimum
fuel signal to the actuator (maximum fuel signal on a reverse acting control).
