Atkinson Electronics GSCM-MINI-50 User manual

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
Web Site: www.atkinsonelectronics.com Distributed by:
FEATURES & APPLICATIONS
vv Inexpensive 2 wire to 3 wire start controller for
electric start high speed gas generators.
vv Optimized for use with Outback Invertors.
vv Supports three types of 3 wire generator control
(momentary, maintained, ignition).
vv Fixed Crank time, Over and Under Hz shutdown
thresholds.
vv Maximum Auto-start Run Time Limit (6 hours)
vv Optional Battery charging with fixed set points.
vv Remote Run and Fault indication included.
vv Totally sealed for harsh environment operation
DESCRIPTION
The GSCM-mini is a micro-processor based generator start-
stop module, designed to auto start-stop high speed gas
generators needing a 3 wire connection from a 2 wire manual
start command. It automatically disconnects the starter when
aminimum generator AC Hz. output is measured. It can
monitor the generator’s output for an over or under Hz
condition and shut it down if either is detected. The Gen. Hz
LED is blinks to indicate the cause of the shutdown. Manually
resetting the GSCM-mini by removing the power, removes any
fault shutdown and allows the generator to restart if called to
do so. The GSCM-mini is powered by 12VDC from the
generator battery, and can monitor the battery voltage and
start the generator to charge it’s own battery. All Thresholds
are fixed. The GSCM-mini is a limited function controller, part
of the GSCM family. If adjustability is required use the GSCM
full function Generator Start Control Module.
THREE MODES OF RELAY OPERATION
TheGSCM-mini’s two relay contacts can be configured for
three types of three wire start/stop hook-up configurations;
momentary, maintained and Ignition for Hondas, Onans,
Yamahas,and other brands of generators. This is
accomplished with an optional jumper on terminal 6.
Momentary Start Contact Option #1, terminal 6, has No
Connection. The GSCM-mini defaults to a momentary crank
operation for those generators that use two momentary push
button switches to start and stop the generator. K1 cranks the
Starter and K2 momentarily grounds the magneto. See
Section 1 for operation description.
Maintained Start Contact Option #2, terminal 6, is
grounded. The GSCM-mini changes to a maintained start
operation for generators that use a maintained closed contact
to start (K1). The generator is stopped by opening K1 and
closing K2 contact, momentarily grounding the magneto. See
Section 2 for operation description.
Ignition Key Switch Start Contact Option #3, terminal 6, is
connected to B+ (12VDC). The GSCM-mini simulates an
automobile ignition switch, K2 closes, maintains a closed
ignition contact for the generator to run and K1 closes
momentarily to crank the starter motor. and de-energizes
when the start signal is removed. The K1 relay operates in a
momentary crank configuration. See section 3 for operation
description.
LED INDICATION DESCRIPTION
The GSCM-mini has six indication LEDs. The Start LED, blinks
every 5 seconds to indicate ready for a start signal, blinks every
2.5 sec. to indicate running in Auto Start mode, ‘On’ continuously
indicates running in Manual Start mode.
The Generator Hz LED, blinks to indicate over/under Hz Fault
and Start Failure do to Maximum crank attempted. A slow blink
indicates an under Hz condition, a fast blink indicates an over Hz
condition. ‘On’ continuously indicates AC present in a non run
condition. A double blink indicates a start failure condition. The
Run LED, ‘On’ continuously indicates a valid Run signal from the
generator. The Fault LED,‘On’ indicates a Fault condition has
occurred and GSCM is in lockout and must be reset. The K1
and K2 LEDs indicate the relay status.
OPERATIONAL THRESHOLDS
TheGSCM-mini has fixed operational thresholds. Those are:
Crank delay, Maximum Crank time, Crank Hz. Disconnect,
Under Speed Shutdown, Over Speed Shutdown, Max auto start
run time, and auto detects the Battery voltage to determine the
auto start and auto stop threshold values for 12V, 24V, and 48V
battery systems. If adjustability is required then use the GSCM
full function control module.
Crank delay: 5 seconds
Maximum Crank: 20 seconds
Crank Disconnect: 35Hz
Under Speed Shutdown: 45Hz
Over Speed Shutdown: 55Hz
Max Auto Start Run time: 6 Hours
Auto Start/Stop
Thresholds: Start Stop
12V system 11.5V 13.8V Standard
24V system 23.0V 27.6V Auto selects
48V system 46.0V 55.2V Call for option
Relay Configuration: Open input = Momentary Crank
(TERMINAL 6) Grounded input = Maintained Crank
B+ (12VDC) input = Ignition & Crank
Fault Detection: Start Failure, (3 attempts)
Over Hz condition (10 seconds)
Under Hz condition (10 seconds)
Max Run time Auto restart within 30m

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
Web Site: www.atkinsonelectronics.com Distributed by:
GSCM-mini WIRING DIAGRAM AND CONTROLLER CONFIGURATION

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
Web Site: www.atkinsonelectronics.com Distributed by:
OPTION #1 MOMENTARY START CONTACT - TYPICAL GENERATOR W/ STARTER CONTROL BOX
The K1 relay is used to switch the start/crank input which is looking for a momentary signal and opens when the generator has reached
50Hz, or half speed. The K2 relay provides a momentary “stop” signal until the generator AC Hz has dropped to zero. For GSCM-mini
operational sequence details see Page 4, Section - 1
OPTION #2 MAINTAINED START CONTACT TYPICAL GENERATOR W/ STARTER CONTROL BOX
The K1 relay provides a continuous run signal for generators A double pole “kill switch” wired and installed by the user, stops
requiring a “maintained” start signal. The K2 relay provides a the generator instantly in emergency situations such as a fuel
momentary “stop” signal until the generator AC Hz hasspill. One switch pole (N.C.) kills power to the GSCM-mini
dropped to zero. For GSCM-mini operational sequence details opening all relays. The other switch pole (N.O.) shorts out the
see Page 4, Section - 2 magneto for an instant stop.
OPTION #3 IGNITION KEY SWITCH TYPE START CONTACT TYPICAL GENERATOR W/ STARTER CONTROL
The K1 relay is used to switch the starter input which isA single pole “kill switch” wired and installed by the user, stops
looking for a momentary signal and opens when the generator the generator instantly in emergency situations such as a fuel
has reached 35Hz. The K2 relay provides a continuous run spill. One switch pole (N.C.) kills power to the GSCM-mini
signal for generators requiring a “maintained” ignition signal. opening all relays shutting down the ignition switch type
When the GSCM-mini no longer receives a run commandgenerators.
signal (terminal 5 or batteries fully charged, K2 relay opens
telling the generator to shutdown. For GSCM-mini operational
sequence details see Page 5, Section - 3

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
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GSCM-mini MOMENTARY STARTING SEQUENCE (Relay Option #1) SECTION - 1
Once the GSCM-mini-50hz is wired to the generator, Inverter, and is powered by either connecting 12VDC to terminal 2 or turning on
the optional on/off switch connected to terminal 2, the GSCM-mini’s Start LED lights for 5 seconds while it determines how it has been
configured (Relay configuration option, Gen.Hz monitoring). The GSCM-mini then indicates that it is ready to receive a start signal by
blinking the start LED once every 5 seconds. For momentary starting sequence the Relay Configuration terminal 6 has NO connection.
The start signal is created by closing a switch connected between the manual start terminal 5 to B+ terminal 3 or connecting the Aux
+ and Aux - terminals form an Outback Inverter to terminal 5 (start) and terminal 7( ground). The module may also start in automatic
mode based on a battery voltage (see Section-4 for Automatic start for battery charging). If the GSCM-mini detects an AC signal from
the generator before a start command is given (ie: the generator is already running), the GSCM-mini’s Gen. Hz LED will turn On, and
it will not execute a start sequence until the AC Hz. signal has been cleared.
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, K1 relay closes to crank the starter, and 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 closes for 5 seconds, then
the Gen Hz LED does a double blink, the Fault LED turns ON and the GSCM-mini enters the Max. Crank lockout condition. This
lockout condition remains until the GSCM-mini is reset by removing power from terminal 2 (see GSCM-mini wiring diagram,
previous page) 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 the generator
AC output frequency exceeding the crank disconnect setting of 35Hz and is indicated with the Run LED 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 5 minute delay period in auto-start mode.
6. When a run condition is detected, the GSCM-mini turns ON the Run LED and 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, etc. the GSCM-mini blinks
the Gen Hz LED for an Under Hz condition, after 60 seconds the Run LED turns Off, Fault LED turns On, and K2 relay energizes
for 5 seconds. The GSCM-mini enters a Fault shutdown lockout condition. A power down reset is required to clear the lockout
condition.
8. Once a run condition is detected and the generator will continue to run until one of the following occurs: the manual start/run signal
is removed, an Over or Under Hz condition occurs (If Gen. Hz. Shutdown is enabled) or the generator runs out of gas.
9. During shutdown, K2 relay closes to ensure shutdown of the generator by grounding out the ignition, etc. It remains closed until
the AC Hz signal from the generator has gone to zero for 5 seconds ensuring that the generator has shutdown.
10. The generator remains off until another start signal is received.
GSCM-mini MAINTAINED STARTING SEQUENCE (Relay Option #2) SECTION - 2
The GSCM-mini-50hz is wired to the generator, Inverter, Relay Configuration terminal 6 is connected to ground (terminal 7). The GSCM
is then powered by either connecting 12VDC to terminal 2 or turning on the optional power/reset switch connected between terminal
2 & B+ (12VDC). The GSCM-mini’s Start LED lights for 5 seconds while it determines how it has been configured (Relay configuration
option, Gen.Hz monitoring). The GSCM-mini is configured for maintained start sequence and then indicates that it is ready to receive
a start signal by 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 start/run signal
is received, the start LED lights continuously. After a 2 second delay, K1 relay closes to start the generator. The K1 relay remains
closed until either the start/run signal is removed or the maximum cranking time of 1 minute is reached.
2. If the generator fails to start after a single 1 minute start period, K2 relay closes for 5 seconds, then the Gen Hz LED does a double
blink, the Fault LED turns ON and the GSCM-mini enters the Max. Crank lockout condition. This lockout condition remains until
the GSCM-mini is reset by removing power from terminal 2 (see GSCM-mini wiring diagram) and reconnecting power. It will then
clear the lockout condition, and enter “Ready” mode with the Start LED blinking Every 5 seconds.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
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GSCM-mini MAINTAINED STARTING SEQUENCE continued SECTION - 2
3. When the generator starts, K1 relay remains energized. A valid run condition is determined by the generator AC output frequency
exceeding the crank disconnect setting of 35Hz and is indicated by the Run LED being turned ON.
4. If the generator starts but shuts down after a few seconds due to a fuel problem, etc. K2 relay closes for 5 seconds, ensuring the
generator is not still running, the GSCM-mini enters a 60 second delay period in which the Start LED blinks rapidly. At the end of
the period the GSCM-mini re-enters “Ready” mode, and will then try to start the generator again in manual mode or after a 5 minute
delay period in auto-start mode.
5. When a valid 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, the GSCM-mini begins ( if enabled) monitoring the AC Hz signal for
over/under Hz condition.
6. If the generator starts but shuts down after the 60 seconds stabilization period, due to a fuel problem, etc. the GSCM-mini blinks
the Gen Hz LED for an Under Hz condition , after 60 seconds the Run LED turns Off, Fault LED turns On, and K2 relay energizes
for 5 seconds. The GSCM-mini enters a Fault shutdown lockout condition. A power down reset is required to clear the lockout
condition.
7. The generator continues running until one of the following occurs: the manual start signal is no longer received, an Over or Under
Hz condition occurs (If Gen. Hz. Shutdown is enabled) or the generator runs out of gas.
8. When the start/run signal is removed, K1 de-energizes, then ½ second later, K2 relay energizes, remains closed until the AC Hz
signal from the generator goes to zero for 5 seconds ensuring generator shutdown.
9. The generator remains off until another start signal is received.
GSCM-mini IGNITION/CRANK STARTING SEQUENCE (Relay Option #3) SECTION - 3
The GSCM-mini-50hz is wired to the generator, Inverter, Relay Configuration terminal 6 has been connected to B+(terminal 3). The
GSCM is then powered by either connecting 12VDC to terminal 2 or turning on the optional power/reset switch connected between
terminal 2 & B+(12VDC). The GSCM-mini’s Start LED lights for 5 seconds while it determines how it has been configured (Relay
configuration option 1,2, or 3, Gen.Hz monitoring). The GSCM-mini is configured for ignition/crank start sequence, and indicates that
it is ready for a start signal by blinking the start LED once every 5 seconds. The 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 (ignition) 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 the
GSCM-mini enters its Max. Crank Lockout Fault condition, the Gen Hz LED does a double blink, the Fault LED turns ON. This
lockout condition remains until the GSCM-mini is reset by removing power from terminal 2 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 the generator
AC output frequency exceeding the crank disconnect setting of 35Hz.
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 it begins (if enabled) 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, etc. the GSCM-mini blinks
the Gen Hz LED for an Under Hz condition , after 60 seconds the Run LED turns Off, Fault LED turns On, and K2 relay de-
energizes. The GSCM enters a Fault shutdown lockout condition. A power down reset is required to clear the lockout condition.
8. The generator continues running until one of the following occurs: the manual start signal is no longer received, an Over or Under
Hz condition occurs (If Gen. Hz. Shutdown is enabled) or the generator runs out of gas.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
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GSCM-mini IGNITION/CRANK STARTING SEQUENCE (Relay Option #3) SECTION - 3
9. 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.
10. The generator remains off until another start signal is received.
AUTOMATIC STARTING FOR BATTERY CHARGING SECTION - 4
The GSCM-mini-50hz can monitor either the generator battery voltage or a battery bank voltage and automatically start/stop the
generator based on battery voltage. This is accomplished by connecting the battery voltage to the battery sense input (terminal 4). The
GSCM-mini monitors a battery voltage range of 0 to 60V DC and automatically determines the start and stop set point based on battery
voltage (12, 24, or 48VDC systems). Below 16VDC - 12V thresholds, between 16 to 32V - 24V thresholds, above 32V - 48V thresholds.
This mode is disabled if the voltage on terminal 4 is less than 6V, (no connection).
1. The GSCM-mini monitors the battery sense input and when the battery voltage drops below the start threshold the Start LED begins
blinking (every second). When the battery voltage has remained below the start threshold for 5 continuous minutes the Auto start
sequence begins. If the battery voltage rises above the start threshold during the 5 minute period the period starts over.
(Temporary battery voltage fluctuations such as instantaneous inverter loads will not start the GSCM-mini)
2. The GSCM-mini starts the generator based on the relay configuration (as described in Sections 1, 2, or 3). The start LED blinks
every 3 seconds while the GSCM-mini is running in auto-start mode.
3. The GSCM-mini shuts down the generator (as described in Sections 1, 2, or 3) whenever the battery voltage exceeds the stop
threshold for 10 minutes. The Start LED blinks (every second) during this 10 minute period. The GSCM-mini will exit the 10 minute
period and shutdown the generator if the battery voltage exceeds the stop point by +1.0V (for a 12V system, 2V for 24V system).
The generator remains off until the battery voltage drops below the start threshold voltage.
4. The GSCM-mini will shutdown the generator when it has run in auto-start battery charging mode for 6 hours and has not charged
the battery above the shutdown threshold. The GSCM-mini then returns to ready mode looking for a start command. If the battery
voltage drops below the Auto start threshold within 30 minutes of a max Run Time shut down the GSCM-mini will enter a Max run
time fault condition and lock out the start sequence and requires a power down reset. The Gen Hz LED will blink 3 quick blinks
every 5 seconds and the fault LED is on continuously.
5. If the user wishes to manual-start the generator from a separate pressure switch, level switch, thermostat or inverter start contact,
etc., the battery voltage is fed through the switch (pressure switch etc.) contact to Manual start terminal 5. Closing the contact will
cause the GSCM-mini to start the generator. Some invertors (Outback) provide a switch 12VDC signal to start the generator. This
switched voltage can be connected directly to the manual start terminal 5 and ground terminal 7. (See GSCM-mini wiring diagram
for hook-up).
GSCM-mini WITH A POWER/ RESET SWITCH OR MANUAL/OFF/AUTO SWITCH OPTION SECTION - 5
An optional Power/Reset switch may be used to turn the GSCM-mini OFF for generator service or preform a RESET on the GSCM-mini
to clear a fault lockout condition. The switch would be connected between B+ and terminal 2 of the GSCM-mini (See wiring diagram
for details). The Manual start signal is created by connecting terminal 3 (B+ 12VDC) to terminal 5 (man. Start) through a remote start
switch, or it may be generated by an Outback Inverter using the AUX+/- connections on the remote terminal block. The Outback provides
a switched +12VDC signal for the GSCM-mini’s manual start input. An optional Manual-Off-Auto switch can be installed to provide user
flexibility for manual starts, Auto starting from Inverter, or turning off an auto start . (see GSCM-mini’s wiring diagram, lower right hand
corner)..
GENERATOR EMERGENCY SHUTDOWN WITH THE GSCM-mini SECTION - 6
The GSCM-mini Generator Start Stop module is NOT AN EMERGENCY SHUTDOWN DEVICE!! If the manual start signal is removed
the generator will go through a normal shutdown which may take up to 15 seconds to completely shutdown the generator
ARECOMMENDED EMERGENCY SHUTDOWN SOLUTION is to install a separate “Kill” switch and label it as such. The
recommended wiring is shown on page-2 of these instructions and also in Application 1. Disconnecting the power to the GSCM-mini
module will force the relays to open. This will shutdown generators that require a maintained run signal from K1 relay. However this
also prevents the K2 relay from closing to shutdown those generators requiring a momentary stop signal. Using a double pole “Kill”
switch and wiring the second pole in parallel with the K2 relay terminals will force the generator to stop in an emergency situation such
as a fuel spill. (see note 1 on wiring diagram, page 2, for Ignition/crank emergency shutdown option)

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
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GSCM-mini FAULT SHUTDOWN CONDITIONS SECTION - 7
The GSCM-mini detects Four (4) fault shutdown conditions (over/under Hz. detection not enabled until the generator has been running
for 60 seconds) and will shutdown the generator after 10 continuous seconds of Hz. fault condition, locking it out until a power down
reset and power back up. The Fault open collector transistor output (terminal 12) will energize a user supplied remote lamp or DC relay
(not exceeding 300 milliamp coil current) whenever a fault shutdown occurs and will de-energize the relay when the fault is reset. The
shutdown conditions are as follows:
1. Failure to start with 3 cranking attempts (see Section-1:3, 2:2, & 3:3 ). The Gen. Hz Shutdown LED does a double blink and Fault
LED On continuously.
2. High frequency (over Hz.) condition. The generator AC frequency is monitored on terminals 9 and 10. If the Gen. Hz. enable
terminal #8 is grounded and the generator output frequency exceeds the 55 Hz fixed threshold for 10 seconds, the generator shuts
down and the Generator Hz shutdown LED blinks rapidly. The “Generator Hz” LED blinks during this 10 second period.
3. Low frequency (under Hz.) condition. If the Gen. Hz. enable terminal #8 is grounded and the generator output frequency remains
below the 45 Hz fixed threshold for 10 seconds, the generator shuts down and the Generator Hz shutdown fault LED blinks slowly.
The “Generator Hz” LED blinks during this 10 second period.
4. Auto Start within 30 minutes of Max Run Time shutdown (see Section-4:4 ). The Gen. Hz Shutdown LED does a triple blink and
Fault LED On continuously.
LED DESCRIPTION SECTION - 8
1. Start: one blink every 5 seconds = Ready mode, looking for a start signal;
one blink every 2.5 seconds = auto start mode operation;
one blink every other second= auto start/stop period,
continuous = manual start signal received;
fast blink = 60 second delay after start signal removed before generator started;
2. Generator Hz fast blink = over speed condition;
Shutdown: slow blink = under speed condition;
double blink = Maximum Crank attempts reached, Failed to Start;
continuous = start function disabled, AC Hz detected before starting;
3. Run: continuous = GSCM has a valid run signal from generator;
4. Fault: continuous = GSCM is in a fault condition and requires a reset;
5. K1 & K2: continuous = Status of K1 and K2 Relays “ON”
SPECIFICATIONS SECTION - 9
SIZE & WEIGHT: 5.13" L x 2.853" W x 1.35" H, 20 OZ RELAY CONFIG.:Open input = Momentary Crank
MOUNTING: 2 screws through tabs,
Mounting holes 3.5" center to center
POWER: 12VDC only
Quiescent current < 10mA
Relay current < 25mA ea.
TERMINALS: 0.250" spade lugs
MANUAL INPUT: B+ (12VDC) input = on condition
Open input = off condition
BATTERY INPUT: 0-60V DC
AUTO START/ Start Stop
STOP THRESHOLD: 12V System 11.5V, 13.8V
24V System 23.0V, 27.6V
48V System 46.0V, 55.2V
(TERMINAL 6) Grounded input = Maintained Crank
B+ (12VDC) input = Ignition & Crank
FREQUENCY INPUT: 120-240V AC 0-100 Hz
OUTPUT RATINGS: Qty. (2) 10 Amp 28V DC relay contacts
K1 has 38vdc MOV across contact
Qty. (2) Open collector NPN
transistors, Max. 300mA each
FAULT DETECTION: Start Failure, (3 attempts)
Over Hz condition (10 seconds)
Under Hz condition (10 seconds)
AMBIENT TEMP: -40 to 858C

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
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APPLICATION 1 - REMOTE RV GENERATOR START CONSOLE REPLACEMENT
The GSCM-mini can be used in place of or to replace a typical remote generator control console, that is mounted on the
dash of a motor-home. Instead of a large console unit and cable, the mini uses a small 4 wire 18 gauge signal cable, an
on-off switch with built in light and a separate 12VDC fault light. When the remote switch is turned on, the mini starts
the generator. After the generator starts and comes up to speed the “run” LED lights on the mini and lights the remote
start switch light. If the generator fails to start or fails while commanded to run the “fault” LED on the GSCM mini lights
along with the remote fault 12VDC light. Turning off the power to the GSCM mini resets the fault condition and it is ready
to receive another start command.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
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APPLICATION 2 - AUTO-START RV OR TRAILER GENERATOR BASED ON HOUSE BATTERY VOLTAGE
The GSCM-mini can be used to auto start the generator to charge its own battery or the house battery bank when the
battery voltage gets down to 11.5VDC (See section 4 for Auto Start Operation sequence). This allows the RV or Trailer
to be left unattended with loads such as a heater or refrigerator left turned on during winter or summer usage. The
GSCM-mini has a max run time of 6 hours when activated in a auto start sequence. An optional on-off switch with built
in light can be used to start the generator when 110VAC devices (AC, Microwave, etc) are to used.
When battery voltages drops below 11.5V (auto start) or the remote switch is turned on, the mini starts the generator.
After the generator starts and comes up to speed the “run” LED lights on the mini and lights the remote start switch light.
The GSCMwill allow the generator to run until one of the following: If auto start - battery voltage has risen above 13.8VDC
or it has reached its max run time of 6 hours, or the remote start switch has been turned off. If the generator fails to start
or fails while commanded to run the “fault” LED on the GSCM mini lights. Turning off the power to the GSCM mini resets
the fault condition and it is ready to receive another start command.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
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APPLICATION 3 - OUTBACK 2 WIRE START TO 3 or 4 WIRE GENERATOR START CONTROL
The GSCM-mini can be used with Outback invertors and most 3 wire gas generators . The 2 wire invertor generator start
output is a switched 12VDC signal, the GSCM-mini was designed to accepts the switched 12VDC start signals from the
Outback Inverter and provides two relay contact outputs that can be wired as three or four wire Start/ Stop configurations
(see page three for generator wiring configurations). The GSCM-mini monitors the generators AC output to know when
to dis-engage the starter, if an Over/Under Hz condition has accrued (Optional), and when the generator has shutdown,
either by command or by fault. An optional manual On-Off-Auto switch can be used to manually turn on or off the
generator, or run automatically from the inverter (see above drawing). When a start signal is received the the GSCM-
mini starts the generator. After the generator starts and comes up to speed the “run” LED lights on the mini. If the
generator fails to start or fails while commanded to run the “fault” LED on the GSCM mini lights. Turning off the power
to the GSCM mini either by emergency shutdown switch or an optional power On/Off switch, for 5 seconds and then back
on, resets the fault condition and the mini is ready to receive another start command.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
Web Site: www.atkinsonelectronics.com Distributed by:
APPLICATION 4 - OUTBACK 2 WIRE START TO HONDA EB6500 4 WIRE GENERATOR START CONTROL
The GSCM-mini can be used with Outback invertors and most 3 wire gas generators . In this application the GSCM-mini
is connected to a Honda EB6500 in parallel with its combination Start/Stop switch. The Start signal can be an auto-start
based on either the generator start battery voltage or inverter battery bank voltage on terminal 4 (dashed lines) or from
the 2 wire Outback invertor generator start output. If you are using an Outback inverter it is recommended that the
inverter monitor its battery bank voltage and also the over/under AC Hz conditions. An optional Manual /Off/ Auto switch
can be used with the Invertor’s 12VDC signal (see upper right-hand corner of drawing). The GSCM-mini’s two relay
contact outputs are wired as shown. A DPST relay is used to provide an additional stop contact that the combination
switch uses to shutdown the generator . The GSCM-mini monitors the generators AC output to know when to dis-engage
the starter and when the generator has shutdown, either by command or by fault. When a start signal is received by
the GSCM-mini it starts the generator. After the generator starts and comes up to speed the “run” LED lights on the mini.
If the generator fails to start or fails while commanded to run the “fault” LED on the GSCM mini lights. Turning off the
power to the GSCM mini either by emergency shutdown switch or an optional power On/Off switch, for 5 seconds and
then back on, resets the fault condition and the mini is ready to receive another start command.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-50HZ
ATKINSON ELECTRONICS, INC. REV 5/08
Web Site: www.atkinsonelectronics.com Distributed by:
LIMITED WARRANTY
Atkinson Electronics, Inc. gives this express warranty (along with extended warranty endorsements, where applicable)
in lieu of all other warranties, express or implied, including (without limitation), warranties of merchantability and fitness
for a particular purpose. This constitutes Atkinson Electronics, Inc.'s sole warranty and obligation with regard to our
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All products manufactured by Atkinson Electronics, Inc. are warranted to be free from defects in material and
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intent to transfer to a third party is expressly indicated in a purchase order and/or warranty processing arrangements
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2. Atkinson Electronics, Inc. will correct any defects in material or workmanship which appear within two (2) years from
the date of shipment by Atkinson Electronics, Inc. (or its authorized distributors) to the original Customer. Atkinson
Electronics, Inc. will repair or replace, at our option, any defective products, provided that our inspection discloses
that such defects developed under normal and proper use. This warranty does not extend to goods subjected to
misuse, neglect, accident or improper installation, or to maintenance or repair of products which have been altered
or repaired by anyone except Atkinson Electronics, Inc., unless otherwise stated in writing.
Atkinson Electronics, Inc. will correct any defects in material or workmanship of OEM products (designated as such
in our catalog or web site) which appear within two (2) years from the product date code or from the factory invoice
date, whichever is later.
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4. Atkinson Electronics, Inc. will not accept responsibility for any invoiced goods or services that are not covered by
an Atkinson Electronics, Inc. written purchase order. Under no circumstances does Atkinson Electronics, Inc. agree
to pay for labor or other related expenses associated with the troubleshooting and/or repair of our product without
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5. Information in our descriptive literature is based on product specifications that are current at the time of publication.
Product specifications, design and descriptive literature are subject to change as improvements are introduced.
Although we announce changes as they occur, we cannot guarantee notification to every Customer. Atkinson
Electronics, Inc. warrants delivered products to conform to the most current specifications, design and descriptive
literature.
This warranty policy may be expanded or limited, for particular categories of products or Customers, by information
sheets published as deemed appropriate by Atkinson Electronics, Inc.