Atkinson Electronics GSCM-MINI Manuel - Page 8

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GSCM-mini-d Relay Option 3

The configuration terminal 6 has been connected to B+ (terminal 3), configuring the GSCM-mini-d for ignition/crank start

sequence. The GSCM-mini is then powered by connecting B+ (+12 VDC) to terminal 2. The start LED turns on for 5 seconds

while the GSCM-mini initializes with option #3 ignition/crank starting sequence then begins blinking the start LED once every 5

seconds . The generator starting sequence is as follows:

1. The start LED blinks once every 5 seconds to indicate that the GSCM-mini is in a ready mode. When a manual signal is

received, the start LED lights continuously. After a 2 second delay, K2 relay energizes and remains energized until the

start signal is either removed or the generator fails to start after 3 attempts. K1 relay closes to crank the starter. The

K1 relay remains closed until either the generator starts or the maximum cranking time period (20 seconds) is

reached.

2. If the generator fails to start after the 20 seconds cranking period, K1 relay opens for a resting period of 40 seconds.

The K1 relay then closes again cranking the starter until the maximum cranking time is reached or the generator

starts.

3. If the generator fails to start after 3 cranking attempts with the associated resting periods then K2 relay de-energizes

and enters its shutdown routine, then the generator Hz LED does a double blink, the fault LED turns ON and the

GSCM-mini enters the maximum crank lockout condition. This lockout condition remains until the GSCM-mini is reset

by removing power from terminal 2 (see GSCM-mini wiring diagram page 4) and reconnecting power. The GSCM-mini

will then clear the lockout condition, and enter ready mode with the start LED blinking every 5 seconds.

4. When the generator starts, K1 relay immediately opens, stopping the cranking. A valid run condition is determined by

one of two conditions: A 12V run pilot light signal provided by the generator connected to terminal 8, or by the

generators AC output frequency exceeding the crank disconnect setting of 45Hz (terminals 9 & 10) and is indicated by

the run LED being turned ON.

5. If the generator starts but shuts down after a few seconds due to a fuel problem, etc., the start sequence will revert

to the ready mode after a 60 second delay. During this delay the start LED will blink rapidly. The GSCM-mini will then

try to start the generator again in manual mode or after a 10 minute delay period in auto-start mode.

6. When a run condition is detected, the GSCM-mini turns ON the run LED and open collector transistor output (remote

run lamp) and after a 60 second generator stabilization period begins monitoring the AC Hz signal for over/under Hz

condition.

7. If the generator starts but shuts down after the 60 seconds stabilization period, due to a fuel problem, low oil

pressure, broken AC Hz or 12V run status wire, the GSCM-mini blinks the generator Hz LED for an under Hz condition,

after 60 seconds the run LED turns off, K2 relay energizes for 5 seconds, and fault LED turns on and the generator Hz

LED blinks four times every two seconds. The GSCM-mini enters a fault shutdown lockout condition and must be

powered down to reset the fault lockout.

8. The generator continues running until one of the following occurs: The manual start signal is no longer received, the

auto battery charge voltage or max run time has been reached while running in auto charge mode, an over or under

Hz condition occurs (if generator Hz shutdown is enabled) or the generator runs out of fuel.

When the manual start signal is removed, K2 relay de-energizes opening the ignition circuit shutting down the generator. The

GSCM-mini then monitors the generator AC Hz input to watch for a zero Hz condition before returning to ready mode. If the

AC signal remains the GSCM-mini's generator HZ LED turns on indicating AC Hz. Signal still present and will not return to ready

mode until the AC signal goes to zero. Once it goes to zero the GSCM-mini returns to ready mode.

www.atkinsonelectronics.com

800.261.3602

Ignition and Crank Starting Sequence

Circuit Board Division

Revised 11/2020