Operation
0220−1/A1
Winterthur Gas & Diesel Ltd.
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Slow Turning
1. General
To make sure that the running gear turns freely, it is recommended (as long as the
classification society did not make more primary specifications) to turn the crankshaft
a minimum of one full turn before start-up.
Note: This does not apply if the engine was stopped during a maneuvering
period.
2. Turning Gear
The turning gear is used to turn the crankshaft (approximately one turn in
10 minutes). An arrow next to the flywheel shows the direction and distance that the
crankshaft has turned.
3. Slow Turning with Starting Air
A controlled quantity of starting air is released to turn the running gear at
approximately 5 rpm to 10 rpm.
The WECS−9520 has the command SLOW TURNING for this operation.
The active control stand is used to start the SLOW TURNING operation:
D From the remote control
D At the ECR manual control panel in the control room
D At the local control panel (see 4618−1 WECS−9520 manual control panel).
3.1 Conditions
Note: The numbers e.g. 2.03 refer to items in 4003−2 Control Diagram.
1) Before you start the SLOW TURNING operation, do the steps that follow:
a) Make sure that the turning gear is disengaged.
b) Make sure that the WECS-9520 is set on.
c) Make sure that the oil pumps operate (bearing oil and crosshead oil).
d) Make sure that the related control stand has control.
e) Make sure that the indicator valves are closed.
f) Make sure that the handwheel 2.10 on the shut-off valve for starting air 2.03 is in
the position AUTOMAT.
g) Make sure that the shut-off valves on the starting air bottles are open.
h) Make sure that the air pressure for the air spring is correctly set (see 0250−1
Operating Data Sheet).
i) Make sure that the cylinder lubrication is set to on.
3.2 Function
The function below is almost the same as the engine start function:
D The control valve 2.05 opens the shut-off valve for starting air 2.03. Starting air
flows to the starting air valves 2.07 in the cylinder covers.
D The FCM−20 control the 5/2-way solenoid valves upstream of the starting valves.
The starting valves open and close for short periods only.
D You can use the remote control to change the timing of the starting valves (open /
close) to get the best slow turning speed.
2014
Operation during Usual Conditions
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