Atkinson Electronics GSCM Operating And Installation Instructions - Page 4
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GENERATOR START CONTROL MODULE
GSCM STARTING SEQUENCE
The GSCM indicates that it is ready to receive a start signal by blinking the start LED once every 5 seconds. The GSCM is started
by shorting terminal 5 to ground (terminal 6) for manual start mode. The module may also start in automatic mode based on a
battery voltage (see Section-3) or a 30 day exercise cycle. The start LED is lit continuously to indicate that a manual start signal
has been applied. The various adjustment LED's blink during their respective generator controller time delay periods. If the GSCM
detects an AC frequency input greater than zero (ie: the generator is already running) it will not execute a start sequence. But will
light the Hz LED continuously. The generator starting sequence is as follows.
1.
The start LED blinks once every 5 seconds to indicate that the GSCM is in a "Ready to Receive a Command" mode. When
a manual signal is received, the start LED lights constantly. After a 5 second delay, K1 (glow plug) relay closes to energize
a glow plug. K1 (glow plug) relay remains closed until either the generator starts or the crank shutdown-lockout condition
is reached.
2.
An adjustable 5 to 60 second crank delay period starts when K1 (glow plug) relay is energized.
3.
After the crank delay period, K2 (crank) relay closes to crank the starter while K3 (ignition) relay closes to energize the
ignition. K2 (crank) relay remains closed until either the generator starts or the maximum cranking time period (0 to 60
seconds) is reached.
4.
If the generator fails to start after cranking, K2 (crank) relay opens for a resting period equal to twice the maximum cranking
time adjustment, the max. crank LED blinks during this period. K2 (crank) relay then closes again cranking the starter until
the maximum cranking time is reached or the generator starts.
5.
If the generator fails to start after 4 cranking attempts with the associated resting periods then K3 (ignition) relay opens, K4
(shutdown) relay closes for 5 seconds then the max. crank shutdown fault LED lights and the GSCM enters the max. crank
lockout condition. This lockout condition remains until the reset terminals 7 and 8 are shorted momentarily, after which the
start LED blinks for 60 seconds and then enters the "Ready to Receive a Command" mode. Powering down the GSCM will
also reset a shutdown or lockout mode, with the GSCM entering the "Ready to Receive a Command" mode after power up.
6.
When the generator starts, K2 (crank) relay immediately opens, stopping the cranking and K1 (glow plug) relay opens de-
energizing the glow plug. K3 (ignition) relay remains closed during run operation. A valid run condition is determined by the
generator AC output frequency exceeding the run adjustment setting (15 to 75 Hz).
7.
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 to Receive a Start Signal" mode after a 60 second delay. During this delay the start LED will blink rapidly. The GSCM
will then try to start the generator again in manual mode or after a 5 minute delay period in auto-start mode.
8.
When a run condition is detected, the GSCM enters a load transfer delay period, the load delay LED blinks.
9.
After the load transfer delay period, K5 (load) relay energizes to transfer the electrical load to the generator.
10. The generator continues running until one of the following occurs: the manual start signal is no longer received, the auto
battery charge voltage is reached, the 30 day exercise cycle times out or an oil pressure or temperature fault condition occurs.
11. During a normal shutdown, K5 (load) relay opens and the GSCM enters the pre-off cool-down time period, indicated by load
pre-off LED blinking.
12. When this period expires, K3 (ignition) relay opens, then K4 (shutdown) relay closes ½ second later to ensure shutdown of
the generator by grounding out the ignition, etc. It remains closed until the AC Hz signal from the generator goes to zero for
5 seconds ensuring generator shutdown.
13. If the manual start switch is turned off before K5 (load) relay energizes, K3 (ignition) relay opens, then K4 (shutdown) relay
closes to ensure generator shutdown. Then the GSCM enters a 60 second delay period before looking for a new start signal.
14. If the load pre-off time delay is set to 0V, then K3 (ignition) relay and K5 (load) relay de-energize simultaneously for shutdown
followed by K4 (shutdown) relay energizing to ensure generator shutdown.
15. The generator remains off until another start signal is received.
16. The generator will start a 30 day exercise period of up to 1 hour if the exercise time is set above 0 minutes (0V@test point)
and the reset has been applied for 30 seconds, and a DC voltage exceeding 6V is connected to either terminal 11 for exercise
with a load or connected to terminal 12 for exercise without load (energizing K5 load transfer relay). The 30 day LED blinks
once every minute if the exercise function is activated. The 30 day LED lights continuously and the open collector transistor
terminal 17 will pull in a user supplied DC relay (not to exceed 180 milliamp coil current) whenever the generator is running
in exercise mode. The 30 day LED changes to a fast blink for 60 seconds before the generator starts in the exercise mode.
17. If the DC voltage to terminal 11 or 12 is supplied by a photovoltaic panel, the 30 day exercise will start in the morning when
the PV panel starts supplying voltage after the 30 day cycle has passed. Otherwise the start cycle will be 30 days after the
module is powered up and the reset has been applied for 30 seconds, but accurate only to within several hours of the 30 day
time cycle. Not having the PV tied in may cause the generator to start in the middle of the night, disturbing the neighbors
or occupants sleep.
18. Battery equalization can be accomplished by using a relay on 30 day terminal 17 to switch a separate charger in equalize
mode, raising the battery voltage to equalization levels while the generator is running during its 0 to 1 hour exercise period.
A battery charger with an equalization operation is required for this mode.
ATKINSON ELECTRONICS, INC.
Web Site: www.atkinsonelectronics.com
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GSCM
SECTION - 1
REV 8/06