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3.4 Control, starting and stopping sequences
NOTICE
Risk of engine damage due to incorrect action.
Risk of severe damage to property!
• Ensure engine is ready for operation before starting. See engine documentation.
Starting and stopping sequences
The starting sequence is software-controlled and depends on the place of start command input.
To ensure that no mixture is in the engine when ignition is switched on or off, which is a specific requirement
for gas engines, special procedures for engine start / stop are specified.
The maximum number of attempted starts is limited to three. After this, an extended scavenging phase is
initiated with the gas shut-off valves closed and the ignition off in order to purge the intake duct, engine cyl-
inders and exhaust duct (up to the exhaust turbine outlet elbow) with air. The operator shall ensure by means
of structural safeguards that flammable gases or vapors do not arise in hazardous quantities or concentra-
tions in the surroundings of the installation (gas pipework up to gas control valve and exhaust gas system
after turbine). A contact is designated to initiate such safety measures.
Starting sequence
The following steps are performed automatically when a start command is activated with the engine at stand-
still:
1. Setting start counter
2. Priming (optional)
3. Checking gas supply solenoid valves for leaks
4. Activating starter
5. Waiting for starting speed
6. Scavenging the engine
7. Ignition
8. Opening gas supply solenoid valves
9. Waiting for starter disengagement speed
10. Disengaging starter
11. Waiting for idling speed
12. Ramping-up to rated speed
Start termination
1. The maximum number of attempted starts is limited to three following start termination
2. An alarm is then signaled
3. Requesting external ventilation by contact
4. A new engine start request is only possible following fault acknowledgment
Stopping sequence
The following steps are performed automatically when a stop command is activated:
1. Closing gas supply solenoid valves
2. Opening mixture throttles, scavenging residual gas
3. Engine running down to standstill
4. Deactivating ignition
5. Closing mixture throttles
MS150122/00E 2015-07 | Operation | 41
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