Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 140/190 © Woodward
Starting Sequence
If the control is equipped with a three-position frequency controller, a continuous signal (time adjustable via
Parameter 266) is output prior to starting the engine at the "Frequency lower" relay output. The starter is then en-
abled. Following the expiration of the ignition delay time (
Parameter 261) and if the engine is rotating with at
least the configured "minimum speed for ignit." (
Parameter 260), the ignition is enabled. Following the expira-
tion of the gas valve delay (
Parameter 262), the gas valve is then enabled. If the starting sequence finishes suc-
cessfully (the firing speed (
Parameter 275) was exceeded) the starter is disengaged. The gas valve and the igni-
tion remain enabled by means of the firing speed. After reaching the "f-controller: starting frequency" (
Para-
meter 33) and the delayed engine monitoring has expired (
Parameter 274), 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 61). After the GCB has opened, an engine cool down is performed (Parameter 273). 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 275), an engine starting sequence is disabled 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.
Parameters
Parameter 260
min. speed for
000 rpm
This screen is only visible if the
parameter "Pickup" is set "ON".
Gas engine; minimum start speed 0 to 999 rpm
L The minimum starter speed can only be detected using an enabled magnetic
pick-up (Parameter 280).
Once the ignition delay (
Parameter 261) has expired, the engine must exceed the
speed configured with this parameter in order to enable the ignition relay (relay
manager function 84).
Parameter 261
Ignition delay
00s
Gas engine; ignition delay 0 to 99 s
In gas engine applications a purging operation is frequently desired prior to start-
ing. The ignition delay is initiated when the starter is engaged. If this time has ex-
pired and the "Minimum speed for ignition" (
Parameter 260) has been exceeded,
the ignition is enabled.
Parameter 262
Gasvalve delay
00s
Gas engine; gas valve delay 0 to 99 s
This timer is initiated once the ignition is enabled. Once this timer has expired and
the engine speed is at least 150 rpm, the gas valve is opened. Upon reaching the fir-
ing speed (
Parameter 275) the relay remains energized until the engine stops.
Parameter 263
Starter time
00s
Gas engine; engagement time of the starter 2 to 99 s
The maximum amount of time the starter will crank the engine during a start se-
quence.
Parameter 264
Start pause time
00s
Gas engine; time between two start attempts 1 to 99 s
The delay time between the individual start attempts.

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English