MAK M43C Operating Instructions Manual page 1010

Manual B36146V2.C
engine that will function as PTI (Power Take In). This engine will always be in Slave
mode.
4.5.2 Detailed description of operation
Master
The synchronise pulse starts the clutch sequence. The Clutch enable is given when the
speed (clutch speed) is above the Lower Speed Limit but under Max Clutch Speed. If
clutch feedback is not received within 60 seconds after the synchronise pulse is given,
the clutch attempt stops.
On a one-engine application, the engine will always run in Master mode. No LON
communication link has to be established.
Synchronize Slave
The clutch sequence starts after the synchronise pulse is given. The synchronise pulse
increases the speed reference with the Speed Offset (rpm).
The Clutch enable is given if the clutch speed is above Lower Speed Limit and equals the
sum of Speed input (speed master engine) and Speed Offset (rpm). If clutch feedback is
not received within 60 seconds after the synchronise pulse is given, the clutch attempt
stops
Softloading Slave
Two seconds after the clutch own feedback from the second engine is received, the
engine starts to softload from the actual actuator level (%act) till the engine reaches the
same level as the master engine. The load rate is adjusted with Load Rate (%act/s). As
soon as the level of the master is reached, the slave follows the actuator signal received
from the master.
4.5.3 Transfers between Master and Slave
The following conditions transfer the master engine to slave:
- Unload own engine
- Stop own engine.
The following conditions transfer the slave engine to master:
- Unload other engine
- Stop other engine
- Clutch other engine opens.
4.5.4 Unloading
Unloading is only allowed on the slave engine. If an Unload own engine is requested on a
master engine the control automatically transfers master to slave and at the same
transfers the slave to master. After a near to bumpless transfer the engine starts to
unload with the Unload Rate (%act/s). As soon as the engine reaches the Unload Trip
Level the Engine Unloaded relay output will be activated which indicates that the clutch
can be opened. If during the unload sequence the other engine is stopped (stop other
engine) or the clutch other feedback from the other engine is removed, the unload
sequence is stopped and the engine becomes master.
4.6 Propulsion Mode with Generator
Propulsion mode with Generator requires a speed reference at rated speed. This is done
by increasing the remote speed reference. The pitch is then controlled by the clutch
control unit as soon as the breaker is in, the speed reference is blocked externally at
20 mA. When sliding frequency is selected, the remote speed reference can be adjusted
Woodward
Description of System Operation
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