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 start 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 re-
quirement for gas engines, special procedures for engine start / stop are specified.
The maximum number of starts is limited to three successive starts. Following these three starts, an
extended purging phase is carried out with the gas shut-off valve closed and the ignition system switch-
ed off. Intake system, engine cylinders and exhaust system (up to the outlet elbow of the exhaust tur-
bine) are purged with air. The plant-side part of the installation (gaseous fuel line up to gas dosing valve
and exhaust system after turbine) must be ventilated by appropriate systems or protected with shield
gas. A 24V digital output is provided to activate such systems.
Start sequence
If a start command is activated with the engine being at standstill, the following steps are carried out
automatically:
1. Setting start counter
2. Prelubricating until the desired oil pressure is reached (optional)
3. Checking gas supply solenoid valves for leaks
4. Activating starter
5. Waiting for starting speed
6. Purging engine with air
7. Ignition
8. Opening gas supply solenoid valves
9. Waiting for starter disengagement speed
10. Stopping starter actuation
11. Waiting for idling speed
12. Runup to rated speed
Start termination
1. If a start was terminated, the maximum number of start is limited to three successive starts.
2. Following this, an alarm is output
3. External ventilation request via 24V digital output
4. Engine start is disabled as long as the fault is not acknowledged
Stop sequence
If a stop command is activated, the following steps are carried out automatically:
1. Gas supply solenoid valves close
2. Mixture throttles open, residual gas is purged with air
3. Engine coasts down to standstill or for a maximum coasting period
4. Deactivation of ignition
5. Mixture throttles close
MS150059/02E 2013-10
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TIM-ID: 0000017305 - 004