Automatic Generator Control Module

Description (Basic)

The Model AECM103F is an Automatic Engine Control Module designed to automatically start and stop the engine. It will indicate the operational status and fault conditions, automatically shut down the engine and indicate the start engine failure by a flashing LED on the front panel. Other simultaneous faults are indicated by steady LED.

Start

0.5 second after the fuel relay is energized, the 3 attempt start will begin its start sequence: the start relay will energize, feeding battery +ve (on terminal 6) to terminal 7 and thence on to the starter circuit. The crank period is set for 12 seconds. If the engine has not fired by the end of 1st attempt, the starter is turned off for a 20 sec. period. The sequence will then repeat up to a maximum number of start attempts.

During engine cranking and for a short time afterwards the protection hold-off timer is active and the relevant alarms inputs are inhibited. This enables the engine to start and achieve normal running conditions. Once the timer has expired (reprogrammable) the inputs are enabled providing normal protection from the module.

Following a successful start, sensed when AC alternator's voltage rises above 40% of nominal, the crank relay is de-energized and latched out to prevent reengagement of the starter with the engine running.

The starter relay can only energize for 2nd and 3rd crank cycle if "Low Oil Pressure" is sensed, to confirm that the engine is stationary. This is designed to prevent damage to the starter and ring gear in the event of the control module not sensing that the engine has started (i.e. terminals 11 and 12 are not connected to the alternator AC output or AC alternator is faulty).

Should the engine still fail to start after the maximum number of attempts, START FAIL is displayed and the starter is latched out until reset via stop position of (rocker switch, selector switch, key switch, push buttons where applicable).

Operation of the module is via (rocker switch, push buttons, selector switch, key switch, where applicable) mounted on the front panel or via remote start terminal 1.

Relay outputs are provided for:

Fuel Solenoid Output
Start Output

The relays supply

positive plant supply out.

Configurable inputs are available for:

Low Oil Pressure.
High Engine Temperature.
Remote Start.
Fuel solenoid type configuration (N/O-N/C) (optional feature).

The control module is set for N/C fuel solenoid type by default.

AC alternator monitor.
Alarm input "EMERGENCY STOP" (N/O). This allows the module to stop at any time in case if a problem occurs.It will be impossible to start the engine If the "EMERGENCY STOP" button is activated.

Multiple alarm channels are provided to monitor the following:

Under/Overspeed (speed fault)
Low oil pressure
High engine temperature
Fail to Start
Cranking
Fueling

The AECM 103F series modules have been designed for front panel mounting.

The module is fitted into the cut-out with the fixing clips removed.

These are then fitted from the rear.

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DC Supply: 8 to 30 V Continuous

Max. Operating Current: 200 mA at 12 V

Max. Standby Current: 20 mA at 12 V

Alternator Input Range: 100 - 300 V AC

Low Frequency Limit: 30 Hz; (reprogrammable)

High Frequency Limit: 57Hz; (reprogrammable)

Number of attempts: 3 (reprogrammable)

Crank duration: 12 sec. (reprogrammable)

Hold-off timer set for: 7 sec. (reprogrammable)

Start Relay Output: 2 Amp DC at supply voltage

Fuel Relay Output: 2 Amp DC at supply voltage

Dimensions: 72 X 72 X 82mm