Automatic Generator Control Module

Description [revised 17/12/2011] [load control included]

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 7] to terminal 2 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.

After a successful start, when engine's parameters are settled (when 7 sec time delay provided by hold-off timer is timed out), the Load Control Output will energize and send a signal from terminal 10 to an external power relay. This energizes a contactor which will connect the AC alternator output to the load. The run time before accepting load and the run time after relieving load (while generator is still running and is ready to accept the load again if the remote/local start signal is switched back on) are reprogrammable with a limit of 255 sec [4.25 min] max.(for each timer).

The starter relay can only energize for 2nd and follow on 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 doesn't generate voltages for some reason].

Should the engine still fail to start after the maximum number of attempts, START FAIL LED is displayed and the starter is latched out until reset via stop position of manual starting switch / terminal 1.

Relay outputs are provided for:

Fuel Solenoid Output
Start Output
Load Control Output
Preheat Output (optional)

The relays supply positive plant supply out.

Configurable inputs are available for:

Remote Start [Terminal 1]
High Engine Temperature [Terminal 6]
Low Oil Pressure [Terminal 3]
Frequency Sensor ON/OFF [terminal 14]
AC alternator monitor [Terminals 11 and 12]
Alarm input [Terminal 4] "EMERGENCY STOP" [normally open]. This allows the module to stop the engine at any time in case if a problem occurs.It will be impossible to start the engine If the "EMERGENCY STOP" button is active.

Multiple alarm channels are provided to monitor the following:

Fail to Start
Emergency stop is active
Low oil pressure
High engine temperature
Under/Overspeed [speed fault]
Generator on load

The AECM 103XXX 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.

...........................................................................................................................................................................................

SPECIFICATION [default settings]

Click here if changes required

DC Supply: generator battery 12V or 24V

Max. Standby Current: 10 mA @ 12 V

Alternator Input Range: 300 VAC max

Under speed shutdown: @ 30 Hz [45Hz for USA and Canada]

Over speed shutdown: @ 57 Hz [69Hz for USA and Canada]

Number of attempts: 3 [10 attempts max if required]

Crank duration: 12 sec

Preheat time: 10 sec

Load on time delay: 60 sec

Load off time delay: 60 sec