Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 27 / 182

Manual 26641 2301E Digital Control
Woodward 17
Idle / Rated Speed
The external contact used to activate the Rated Speed command connects to
terminal 36 (default). This discrete input changes the control operation by
increasing the speed reference to RATED SPEED and decreasing the speed
reference to IDLE SPEED. When the switch or relay contacts are closed, the
speed reference will ramp for a time set by the Accel Time to the rated speed
control point. When the switch or relay contacts are open, the speed reference
will ramp for a time set by the Decel Time to the idle speed control point. The Idle
Speed function is disabled by internal logic when the generator breaker is closed.
The Rated Speed input should be left closed when the generator breaker is
closed. If the application does not require an idle speed setting, the Rated Speed
input can be left closed at all times. This can be done by connecting it directly to
the positive Discrete Input Power source. The logic function of this input can be
modified to be normally open or normally closed.
Idle/Rated Software Switch
An optional automatic Idle to Rated switch is also available. When the engine is
started it will control at the idle speed setpoint, after a tunable delay time the
speed reference will ramp to the rated speed setpoint. This switch is enabled in
Configure menu A**Speed Control Functions** parameter 11 ENABLE AUTO
IDLE/RATED (set to TRUE). In Service menu G**Speed Setting** parameter 12
DELAY TIME IDLE TO RATED can be adjusted to set the delay time before
rated is selected.
CB Aux/Droop Contact
The input switch or relay contact used to activate the Load Control connects to
terminal 37 (default). This discrete input is used to switch the control into
isochronous mode, which allows the Load Control Function to operate. It is
typically connected to an auxiliary contact on the generator circuit breaker. When
the breaker closes, the input switch or relay contact should also close. When the
external switch or relay contacts are open, the control will operate in Droop
Mode. A switch in series with the auxiliary contact on the generator circuit
breaker will allow manually selecting Droop Mode or Base Load/Isochronous
Mode. Open this switch for Droop Mode. Close this switch for Base
Load/Isochronous Modes.
When both the droop contact and circuit-breaker auxiliary contact are closed, the
control is in the isochronous load-sharing mode (Figure 2-2). In this mode the
internal load-sharing-line relay is energized, the droop signal is disabled
permitting isochronous load sharing, and the load-matching circuit is connected
to the load-sharing lines. The Generator Load contact at terminal 40 must be
closed for isochronous load sharing, otherwise the generator load will be
controlled at the unload trip level, and the internal relay will not energize to allow
load sharing. The logic function of this input can be modified to be normally open
or normally closed.
The control is in the droop mode whenever the circuit-breaker
auxiliary contact is open. If a single prime mover is required to run
isochronously with an isolated load, enter Load Droop Percent = 0.0
when making *LOAD SETTING * adjustments.