Woodward GCP-30 Series - Figure 3-14: Wiring Diagram for Opening Gas Valves with the GCP-30 from V4.1001

Manual 37278B GCP-30 Series - Genset Control
© Woodward Page 127/174
Starting Sequence
If the control is equipped with a three-position frequency controller, a continuous signal (time adjustable via
Parameter 298) is output prior to starting the engine at t
he "Frequency lower" relay output. The starter is then
enabled. Following the expiration of the ignition delay time (Parameter 292) and if the engine is rotating with at
least th
e configured "minimum speed for ignit." (Parameter 291), the ignition is enabled. Following the expira-
t
ion of the gas valve delay (Parameter 293), the gas valve is then enabled. If the starting sequence finishes suc-
cessfully
(the firing speed (Parameter 308) was exceeded) the starter is disengaged. The gas valve and the igni-
tion rem
ain enabled by means of the firing speed. After reaching the "f-controller: starting frequency" (Para-
m
eter 50) and the delayed engine monitoring has expired (Parameter 307), the speed controller is enabled.
Stopping Sequence
When the start request is terminated, a power reduction is performed (if the real power controller is enabled,
Parameter 87). After the GCB has opened, an engi
ne cool down is performed (Parameter 306). When the engine
cool down period expires, the gas valve is closed, and the engine is stopped. If the engine speed falls below the
firing speed (Parameter 308), an engine starting sequence is disabl
ed for 10 seconds. If the engine cannot be
stopped, an alarm message is issued after 30 s, and a class F3 alarm is initiated.
Following negative deviation from the firing speed, the ignition remains enabled for an additional
5 seconds so that the remaining gas is able to combust.
Safety Instructions To Control Gas Valves
In order to ensure a safe shutdown of the gas valves, a separate shutdown circuit must be utilized.
To prevent gas from escaping through the gas line due to stuck relays the following is recommended.
Controlling gas valves with the GCP-30
The GCP-30 relay manager from V4.1001 and on contains function 131. This function exists in the GCP- 30 so
that a relay configured with this function behaves like the "Gas valve" relay.
The wiring diagram shown below is an example of a recommended gas valve control system in the gas line.
Emergency
stop
K1
K2
GCP-30
Gas
valve
Relay
manager
param. 131
K1
K2
Gas valve 1 Gas valve 2
GCP-30
44
43
Figure 3-14: Wiring diagram for opening gas valves with the GCP-30 from V4.1001