DSE Model 5220 Automatic Mains Failure & Instrumentation System Operators Manual
5220 OPERATING MANUAL ISSUE 5.1 18-Jun-07 AM
7
Whether the start sequence is initiated by mains (utility failure) or by remote start input, the follow sequence is
followed :
To allow for short term mains supply transient conditions or false remote start signals, the Start Delay timer is
initiated. After this delay, if the pre-heat output option is selected then the pre-heat timer is initiated, and the
corresponding auxiliary output (if configured) will energise.
NOTE:- If the mains supply returns within limits, ( or the Remote Start signal is removed if the start
sequence was initiated by remote start) during the Start Delay timer, the unit will return to a stand-by
state.
After the above delays the
Fuel Solenoid
is energised, then one second later, the
Starter Motor
is engaged.
The engine is cranked for a pre-set time period. If the engine fails to fire during this cranking attempt then the
starter motor is disengaged for the pre-set rest period. Should this sequence continue beyond the set number of
attempts, the start sequence will be terminated and
Fail to Start
fault will be displayed accompanied by a flashing shutdown
symbol.
When the engine fires, the starter motor is disengaged and locked out at a pre-set frequency from the Alternator
output. Alternatively a Magnetic Pickup mounted on the flywheel housing can be used for speed detection (This is
selected by PC using the 5200 series configuration software). Rising oil pressure can also be used to disconnect
the starter motor, however it cannot be used for underspeed or overspeed detection.
After the starter motor has disengaged, the
Safety On
timer is activated, allowing Oil Pressure, High Engine
Temperature, Under-speed, Charge Fail and any delayed Auxiliary fault inputs to stabilise without triggering the
fault.
Once the engine is running, the
Warm Up
timer, if selected is initiated, allowing the engine to stabilise before
accepting the load.
If an auxiliary output has been selected to give a
load transfer
signal, this would then activate.
NOTE:-A load transfer will not be initiated until the Oil Pressure has risen. Thus preventing
excessive wear on the engine.
On the return of the mains supply, (or removal of the
Remote Start
signal if the set was started by remote signal) ,
the
Stop
delay timer is initiated, once it has timed out, the
load Transfer
signal is de-energised, removing the load.
The
Cooling
timer is then initiated, allowing the engine a cooling down period off load before shutting down. Once
the
Cooling
timer expires the
Fuel Solenoid
is de-energised, bringing the generator to a stop.
Should the mains supply fall outside limits again (or the
Remote Start
signal is re-activated) during the cooling
down period, the generating set will return to a on load condition.
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