Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 74 / 130

2301D/2301D-EC Digital Control Manual 26247
66 Woodward
Dynamic Adjustment
The object of the GAIN and RESET adjustment is to obtain the optimum, or
desired, stable prime mover speed response. Connect a dc analog voltmeter to
terminals 13(+) and 14(–) to monitor the actuator voltage.
Increasing the setting of the GAIN to provides faster transient response
(decreases the magnitude of the speed change from a sudden change in load).
To achieve optimum response, slowly increase the GAIN until the voltage on the
voltmeter becomes slightly unstable, then slowly lower the GAIN as necessary to
stabilize the meter reading. Step load the generator, bump the actuator terminal
shaft, or use the software “Bump Act Trigger (T then F)”in the dynamics tuning
sections, to make sure that the prime mover returns to the proper speed with little
overshoot or undershoot of the speed setting. To reduce overshoot, increase the
RESET. When the RESET is in the lower part of its adjustment (0 to 3 on the
scale), increasing the RESET clockwise may require decreasing the GAIN
(turning the GAIN counterclockwise) to maintain stable operation. If the prime
mover is slow in returning to the proper speed, decrease the RESET.
Actuator Compensation Adjustment
If the ACTUATOR COMPENSATION is set as described under Initial Prestart
Settings, no further adjustment is normally required. If a slow periodic instability
remains, slightly increase the ACTUATOR COMPENSATION, and repeat the
GAIN and RESET adjustments. Continue to increase the ACTUATOR
COMPENSATION and readjust the GAIN and RESET until stability is achieved. If
a fast instability or extremely active actuator is evident, slightly decrease the
ACTUATOR COMPENSATION. If necessary, the ACTUATOR COMPENSATION
may be set to .01. This may be required when engine torsionals cause excessive
fuel-linkage movement.
Ramp Time Adjustment
Adjust the ACCEL RAMP TIME to achieve satisfactory prime mover acceleration
to rated speed with minimum overshoot. The number entered is the time in
seconds to change speed from idle to rated.
Adjust the DECEL RAMP TIME to achieve satisfactory prime mover deceleration
to idle speed with minimum undershoot. The number entered is the time in
seconds to change speed from rated to idle.
Raise/Lower Time Adjustment
Adjust the RAISE SPEED TIME to achieve satisfactory prime mover acceleration
toward the raise speed limit with minimum overshoot. The number entered is the
time in seconds to change speed from LOWER SPEED LIMIT to RAISE SPEED
LIMIT.
Adjust the LOWER SPEED TIME to achieve satisfactory prime mover
deceleration toward the lower limit with minimum undershoot. The number
entered is the time in seconds to change speed from RAISE SPEED LIMIT to
LOWER SPEED LIMIT.