DCU 205 User’s Manual
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6.2.
Emergency and harbour generator sets
When the generator set is used as a combined emergency and harbour
generator set, it can be necessary to disable all shutdown functions, except
overspeed, when used for emergency power.
This function is enabled or disabled using DIP switch
no. 7, located on the unit's back panel.
When the Control Unit is set in the STANDBY
position and DIP switch no. 7 is in the OVERRIDE
(ON) position, all the shutdown functions are
disabled except for overspeed. If the Control Unit is set in MANUAL, all the
shutdown functions are enabled, regardless of the position of DIP switch
no. 7.
The following table illustrates the situation.
Selected Function
DIP switch no. 7
Shutdown Functions
STANDBY
OFF
Enabled
STANDBY
ON
Disabled
MANUAL
Don’t care
Enabled
Table 6-, Disabling the Shutdown Functions in Standby mode
When shutdown function DISABLED is selected, the three lamps LUB. OIL
LOW, COOLING WATER TEMP. HIGH and SPARE will flash
simultaneously every 3 seconds, to indicate and remind of this particular
selection.
6.3.
Overspeed adjustment
The Control Unit activates alarm and shutdown when it detects engine
overspeed. Here is how to adjust the overspeed setting to 15% above
nominal speed.
1. Set DIP switch no. 8 to the OVERRIDE position.
2. Turn the OVERSPEED SETPOINT potentiometer a few revolutions
clockwise.
3. For generator sets, run the engine at nominal speed. For main
propulsion engines, run the engine at maximum speed
4. Now, slowly adjust the potentiometer anticlockwise, until the engine
stops and the OVERSPEED lamp begins to blink.
5. Important!!! Turn DIP switch no. 8 back to the NORMAL position.
The overspeed set point has now been raised 15% above nominal or
maximum speed.
