Woodward EGCP-2 - Engine Cranking

EGCP-2 Engine Generator Control Package Manual 26086
68 Woodward
Engine Cranking
The EGCP-2 Control is designed to automatically control the cranking functions
of the engine generator set. In order to safely control engine cranking the
EGCP-2 uses the following setpoints, as found in the Engine Control tuning
menu of the software:
Preglow Time Crank Delay
Crank Time Crank Repeats
Crank Cutout
The description of the above items is found in the Tuning Screens section of this
manual in the Configuration Menu list.
Starting Sequence:
Upon receiving a start command the following events occur:
1. The Preglow Output Energizes for the given preglow time delay, and
remains energized through the crank cycle.
2. After the preglow time expires, the Fuel Solenoid output energizes.
3. 200 ms after the Fuel Solenoid output energizes, the Crank output
energizes.
At this point, the engine should be cranking at a certain rpm, and receiving fuel.
Typically a start would occur in these conditions. To check if a start does occur,
the EGCP-2 monitors the magnetic pickup from the engine. If the magnetic
pickup input indicates that the engine is operating above the Crank Cutout
speed, the EGCP-2 will remove the Crank and Preglow outputs, leaving the fuel
solenoid energized. The engine state in the control overview menu changes from
“OFF” to “RUN”.
If for some reason the engine does not reach the crank cutout rpm level, the
EGCP-2 will crank the engine for the Crank Time. If the engine fails to rise above
the crank cutout level in this time, the EGCP-2 will remove the Crank output
signal, wait for the Crank Delay, and if allowed by the number of Crank Repeats,
will crank the engine again (RETRY). This sequence will continue until the
number of crank repeats is depleted, or until the engine speed rises above the
crank cutout rpm setting, whichever comes first. If the number of crank repeats is
depleted, the EGCP-2 will activate the Crank Fail Alarm Output based on this
Alarm setpoint’s configuration.
NOTE
The preglow output may stay energized between crank attempts if the
preglow time is greater than the sum of the Crank Time and Crank Delay
timers.
IMPORTANT
Set Crank Repeats to zero when starting the engine for the first time with the
EGCP-2. This will prevent starter and ring gear damage to the engine if the
MPU input to the control should be faulty. Monitor Engine Overview Status
menu on the first start and confirm the rpm readout during cranking. After a
successful start is made, the crank repeats may be set to the appropriate
value for the application.