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ELCOS – Parma – Italy – CAM-335
Valid for firmware revision 1.14 and above
Page 6 of 20
OPERATION
FUNCTION SELECTION
The function selected using the key is indicated by its light which goes on.
MANUAL
Image displayed when switched to manual.
Press
to start and
to stop (a quick press is sufficient).
Pressing the
button switches the load from the mains to the generator and vice versa.
In manual mode, the generator protection function can be programmed in two ways:
Display the fault recorded and stop the engine (this is the default setting).
Only display the fault recorded, without stopping the engine. Generator overspeed and emergency anomalies
are programmed to shut down the engine; they cannot be programmed without engine shutdown.
AUTOMATIC
Image displayed when switched to automatic.
When a mains anomaly occurs
— detected by the internal voltage relay inside the control unit or when the
external call delay has elapsed
— the control unit commands the mains contactor to open and the genset to start.
With the engine running and with correct generator voltage and frequency, once the G.S. VOLTAGE PRESENT
DELAY has elapsed, the generator contactor is closed. When operating, the genset is protected from any anomalies.
When the mains voltage is restored and the MAINS VOLTAGE PRESENT DELAY has elapsed, the control unit
commands the generator contactor to open and after the GENERATOR MAINS INTERLOCK time has elapsed, the
mains contactor closes.
The COOLING TIME enables and facilitates subsequent engine cooling before it shuts down.
To facilitate start-up, a special circuit determines a series of start-up attempts, the number, pause duration and start-
up duration of which can be programmed. If running of the entire series of start-up attempts is unable to start the
engine, when the cycle is completed, STARTING FAILURE is displayed and the stop cycle starts.
TEST
Image displayed when switched to test.
In testing, the engine start-up cycle is obtained as in automatic mode, with the exception that the user remains
powered from the mains. If, during the test, a mains anomaly occurs, the control unit remains in test mode but
commands the generator contactor to close.
OFF
Image displayed when switched to off. When set to OFF, the engine cannot be started in any
way and, if it is running, it stops without the engine cooling step.
