Woodward 2301E-ST, Installation And Operation Manual

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Manual 26694 2301E-ST
Woodward 21
Start/Unload Contact (Terminal 36)
Terminal 36 functions as the control’s External Start/Unload contact input. When an external start
command is given (a closed contact state) and all shutdown conditions have been cleared, the control will
cycle through its configured start routine. If all shutdown conditions have not been cleared the unit will not
begin to cycle through its start routine.
The turbine can also be re-started as the turbine is coasting down in speed. There are two ways to start
the turbine in this manner:
1. The first method:
a. While the turbine is coasting down in speed, the Run / Shutdown contact must be in the Run
position and the Start/Unload contact must be in the Start position.
b. The Reset contact can then be toggled, to clear any shutdowns.
c. The speed reference will start increasing, and the valve ramp will also start increasing at the
specified ramp rates.
d. When the speed reference matches the actual turbine speed, the speed PID will take control,
and continue to ramp the speed up to the Rated Speed.
2. The second method:
a. While the turbine is coasting down in speed, the Run / Shutdown contact must be in the Run
position.
b. The Reset contact can then be toggled, to clear any shutdowns.
c. The Start / Unload contact, should be toggled to Unload and back to Start.
d. The speed reference will instantly jump to the actual speed of the turbine, and start ramping
up to the Rated speed.
e. The valve ramp will also start opening at the Valve Ramp rate.
f. When the speed reference matches the actual turbine speed, the speed PID will take control,
and continue to ramp the speed up to the Rated Speed.
g. The second method is the faster of the two methods, as the speed reference does not start
from zero.
This contact input also functions as an external unload command input, when the control is in the
isochronous load-sharing mode and this contact input is opened.
Raise Speed/Load Contact (Terminal 37)
Terminal 37 functions as a raise speed contact input when the unit’s generator breaker contact is open,
and a raise load contact when the unit is in the droop mode. When the control is in the isochronous load-
sharing mode, this contact will increase the speed reference.
If both a Lower Speed contact and a Raise Speed contact are closed, the remote analog setpoint (4–20
mA) mode is enabled, and the control’s internal speed/load setpoint will follow the respective analog input
signal.
Lower Speed/Load Contact (Terminal 38)
Terminal 38 functions as a lower speed contact input when the unit’s generator breaker contact is open,
and a lower load contact when the unit is in the droop mode. When the control is in the isochronous load-
sharing mode, this contact will lower the speed reference.
If both a Lower Speed contact and a Raise Speed contact are closed, the remote analog setpoint (4–20
mA) mode is enabled, and the control’s internal speed/load setpoint will follow the respective analog input
signal.
Released