WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 327 / 394

22. Control Mechanism
22.1 Description
During normal operation the engine speed is controlled by a
governor (1) which regulates the injected fuel quantity to corre-
spond with the load and engine speed.
The regulation movement is transferred to the control shaft (10)
through a adjustable link rod (2).
The movement from the control shaft, to the injection pump fuel
racks (15), is transferred through the regulating lever (6) and the
spring (7). The torsion spring (5) enables the control shaft and,
consequently, the other fuel racks to be moved to a stop position,
even if one of the fuel racks has jammed. In the same way the
torsion spring (7) enables the regulating shaft to be moved
towards fuel-on position, even if an injection pump has jammed
in a no-fuel position. This feature can be of importance in an
emergency situation.
The engine can be stopped by means of the stop lever (16). When
the stop lever is moved to stop position, the lever (17) actuates
the lever (9) forcing the regulating shaft to stop position.
The engine is provided with an electro-pneumatic device with
tripping speed about 15 % above the nominal speed. The electro-
pneumatic device moves every fuel rack to a no-fuel position by
means of a pneumatic cylinder on every injection pump. The
cylinder actuates direct on the fuel rack. The electro-pneumatic
device can also be tripped manually, see section 22.5.
When starting, the governor will automatically limit the move-
ment of the regulating shaft to a suitable value.
The speed governor is provided with a stop solenoid which is
connected to the engine automation system.
22.2 Maintenance
Caution! Special attention should be paid to the function of the system
as a defect in the system may result in a disastrous overspeed-
ing of the engine or in the engine not being able to take load.
32-200636-01 Control Mechanism 22
WÄRTSILÄ 32 22 - 1