Atkinson Electronics GSCM-MINI-D User manual

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
FEATURES & APPLICATIONS
vv Inexpensive 2 wire to 3 wire start controller for
electric start 3 wire DIESEL & 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,
and optional battery charging thresholds.
vv Maximum Auto-start Run Time Limit (6 hours)
vv Remote Run and Fault indication included.
vv Totally sealed for harsh environment operation
DESCRIPTION
TheGSCM-mini-D is a micro-processor based generator
start-stop module, designed to auto start-stop high speed gas
and diesel generators needing a 3 wire connection from a 2
wire12 volt manual start command. It automatically
disconnects the starter when a minimum generator AC Hz.
output is measured, it can monitor the generator’s output,
shutting it down if either an over or under Hz condition is
detected. LEDs are flashed to indicate the cause of the
shutdown. Manually resetting the GSCM-mini-d (by removing
the power), removes the lockout and allows the generator to
restart if called to do so. The GSCM-mini-D 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-D 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
The GSCM-mini-D’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-D defaults to a momentary crank battery systems. If adjustability is required then use the GSCM
operation for those generators that use two momentary push
button switches to start and stop the generator. K2 energizes
for 10 seconds for diesel glow plug operation then, K1 cranks
theStarter. On shutdown, K2 momentarily grounds the
magneto. See Section 1 for operation description.
Maintained Start Contact Option #2, terminal 6, is
grounded. The GSCM-mini-D 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-D 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
TheGSCM-mini-D 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
The GSCM-mini-D 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
full function control module.
Crank delay: 5 seconds
Maximum Crank: 20 seconds
Crank Disconnect: 45Hz
Under Speed Shutdown: 55Hz
Over Speed Shutdown: 65Hz
Max Auto Start Run time: 6Hours
Auto Start/Stop
Thresholds: Start Stop
12V system 11.5V 13.8V Standard
24V system 23.0V 27.6V Call for option
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 stops due to its own fault condition

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
GSCM-mini-D WIRING DIAGRAM AND CONTROLLER CONFIGURATION

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
OPTION #1 MOMENTARY START CONTACT - TYPICAL GENERATOR W/ STARTER CONTROL BOX
The GSCM-mini-D option #1 provides the same momentary glow plug operation for those 3 wire diesel applications where the key switch
or off button is pressed for 10 seconds energizing the glow plugs, then the start button is pressed starting the generator. The GSCM-
mini-D energizes K2 for 10 seconds to heat the glow plugs, then energizes K1 relay, providing a signal to the start/crank input and
removes it when the generator has reached 45Hz, or half speed. The K2 relay also provides a momentary “stop” signal until the
generator AC Hz has dropped to zero. For 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-D
dropped to zero. For GSCM-mini-D operational sequenceopening all relays. The other switch pole (N.O.) shorts out the
details 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 that is looking A single pole “kill switch” wired and installed by the user, stops
for a momentary signal and opens it when the AC line output the generator instantly in emergency situations such as a fuel
has reached 45Hz. The K2 relay provides a continuous run spill. One switch pole (N.C.) kills power to the GSCM-mini-D
signal for generators requiring a “maintained” ignition signal. opening all relays shutting down the ignition switch type
When the GSCM-mini-D no longer receives a run command, generators.
K2 relay opens telling the generator to shutdown. For GSCM-
mini-D operational sequence details see Page 5, Section - 3

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
GSCM-mini-D MOMENTARY STARTING SEQUENCE (Relay Option #1) SECTION - 1
The GSCM-mini-D indicates that it is ready to receive a start signal by blinking the start LED once every 5 seconds. The
CONFIGURATION terminal 6 has NO connection, configuring the GSCM-mini-D for momentary start sequence. 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 from 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-6 for Automatic start for battery charging). If the GSCM-mini-D detects an AC signal from the generator
before a start command is given (ie: the generator is already running) it will turn ON the Generator Hz LED, and not execute a start
sequence until the AC Hz. signal has been rectified. The generator starting sequence is as follows.
1. The start LED blinks once every 5 seconds to indicate that the GSCM-mini-D is in a “Ready” mode. When a manual signal is
received, the start LED lights continuously. After a 2 second delay, K2 relay closes for 10 seconds, causing the 3 wire diesel
generator glow plug(s) to heat. K2 relay then opens and 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 during the 20 seconds cranking period, K1 relay opens for a resting period of 40 seconds. At the end
of the resting period K2 relay then closes for 10 seconds, heating the glow plug(s), after the ten second glow period K2 opens and
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, the K2 relay then closes for 5 seconds
to ensure the generator is not running, the Gen Hz LED does a double blink, the Fault LED turns ON and the GSCM-mini-D enters
the Max. Crank Lockout Fault condition. This lockout condition remains until the GSCM-mini-D is reset by removing power from
terminal 2, waiting 5 seconds and then reconnecting power (see GSCM-mini-D wiring diagram, previous page). This clears the
lockout condition, and the GSCM-mini-D enters “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: the generators AC output frequency exceeds the crank disconnect setting of 45Hz (terminals 9 & 10) or by a 12v run
status signal provided by the generator connected to terminal 8. The GSCM-mini-D indicates that it has received either signal by
turning on the Run LED.
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-D 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-D turns ON the Run LED and transistor output (remote run lamp terminal) and
after a 60 second generator stabilization period begins monitoring the AC Hz signal for over/under Hz condition, if enabled.
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-D blinks the Gen 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 Gen Hz LED blinks four times every two seconds. The
GSCM-mini-D enters a Fault shutdown lockout condition and must be powered down to reset the fault lockout.
8. If no Faults occur, the generator will continue to run until one of the following occurs: the manual start signal is no longer received,
the auto battery charge voltage or Max Auto Run time has been reached while running in Auto Charge Mode, 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-D MAINTAINED STARTING SEQUENCE (Relay Option #2) SECTION - 2
The CONFIGURATION terminal 6 has been connected to ground (terminal 7), configuring the GSCM-mini-D for maintained start
sequence. The GSCM-mini-D is then powered by connecting B+ (12.0 VDC) to terminal 2. The Start LED turns on for 5 seconds while
the GSCM-mini-D initializes with option #2 maintained 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-D is in a “Ready” mode. When a manual start 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 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, GSCM-mini-D runs thru its Shutdown Routine, the Fault LED turns
ON and the GSCM-mini-D enters the Max. Crank lockout condition and the Gen Hz LED does a double blink. This lockout condition
remains until the GSCM-mini-D is reset by removing power from terminal 2 (see GSCM-mini-D wiring diagram), waiting 5 seconds
and reconnecting power. This clears the lockout condition, and returns to “Ready” mode.
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 45Hz and is indicated by the Run LED being turned ON.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
GSCM-mini-D MAINTAINED STARTING SEQUENCE continued SECTION - 2
4. If the generator starts but shuts down after a few seconds due to a fuel problem, etc. The GSCM-mini-D goes thru it’s Shutdown
Routine then re-enters “Ready” mode after a 60 second delay. During this delay the start LED will blink rapidly. The GSCM-mini-D
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 run condition is detected, the GSCM-mini-D 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.
6. 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-D blinks the Gen 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 Gen Hz LED blinks four times every two seconds. The
GSCM-mini-D enters a Fault shutdown lockout condition and must be powered down to reset the fault lockout.
7. If no Faults occur, 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 Gen. Hz. Shutdown is enabled) or the generator runs out of gas.
8. Shutdown Routine, 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-D IGNITION/CRANK STARTING SEQUENCE (Relay Option #3) SECTION - 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-D is then powered by connecting B+ (+12 VDC) to terminal 2. The Start LED turns on for 5 seconds while
the GSCM-mini-D 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-d 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 Gen Hz LED does a double blink, the Fault LED turns ON and the GSCM-mini-D enters the Max.
Crank lockout condition. This lockout condition remains until the GSCM-mini-D is reset by removing power from terminal 2 (see
GSCM-mini-D wiring diagram) and reconnecting power. The GSCM-mini-D 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 45Hz.
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-D 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-D 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-D blinks the Gen 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 Gen Hz LED blinks four times every two seconds. The
GSCM-mini-D 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
Gen. Hz. Shutdown is enabled) or the generator runs out of gas.
9. When the manual start signal is removed, K2 relay de-energizes opening the ignition circuit shutting down the generator. The
GSCM-mini-D 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-d’s Gen. 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-D returns to “Ready’ mode.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
Web Site: www.atkinsonelectronics.com Distributed by:
GSCM-mini-D WITH A MANUAL/OFF/AUTO SWITCH OPTIONS SECTION - 4
The Manual start signal is created by connecting terminal 5 (man. Start) to terminal 3 (B+12VDC) through a Power/Reset Switch (see
GSCM-mini-D wiring diagram). It may also 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-D’s manual start input. An optional Manual-Off-Auto switch
can be installed to provide user flexibility for manual starts, resets, turning the unit off, or Auto starting from Inverter.
(see GSCM-mini-D’s wiring diagram, lower right hand corner).
GSCM-mini-D FAULT SHUTDOWN CONDITIONS SECTION - 5
The GSCM-mini-D detects Five (5) fault shutdown conditions, they 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 65 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 55 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-6:4 ). The Gen. Hz Shutdown LED does a triple blink and
Fault LED On continuously.
5. The GSCM-mini-D is in run mode, and the generator shuts down on a fault condition (low oil pressure, Hi temperature, or out of
fuel) or the AC Hz signal fuse or wire opens or the 12v run status wire opens, the GSCM-mini-D goes thru it’s shutdown routine
and enters a fault condition, turning on the red Fault LED and blinking the Gen Hz LED four times every two seconds.
The 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.
AUTOMATIC STARTING FOR BATTERY CHARGING SECTION - 6
The GSCM-mini-D 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-Dmonitors 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). Below 16VDC - uses 12V thresholds, between 16 to 32V -uses 24V thresholds, above 32V - uses 48V
thresholds. This mode is disabled if the voltage on terminal 4 is less than 6V, (no connection).
1. The GSCM-mini-D 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 5 minute timing cycle
starts over. (Temporary battery voltage fluctuations such as instantaneous inverter loads will not start the GSCM.) The start LED
blinks every 3 seconds while the GSCM-mini-D is running the generator in auto-start mode.
2. The GSCM-mini-D starts the generator as described in sections 1: momentary start, 2: maintained start, or 3: ignition start.
3. The GSCM-mini-D 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-d 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-D will shutdown the generator when it has run in auto-start battery charging mode for 6 hours and has not charge
the battery above the shutdown threshold. The GSCM-mini-D 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-D 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-D to start the generator. Some invertors 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-D wiring diagram).

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
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GENERATOR EMERGENCY SHUTDOWN WITH THE GSCM-mini-D SECTION - 7
The GSCM-mini-D 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-D
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).
LED DESCRIPTION (WHAT THEY MEAN) 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;
triple blink = Auto start attempted with-in 30 minutes of a Max run time (6 hour ) shutdown;
Four blinks every 2 seconds = Ac Hz or 12v run status signal lost during run mode;
continuous = start function disabled, AC Hz detected while in ready mode;
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, 20oz.
MOUNTING: 2 screws through tabs
POWER: 12VDC Battery (9.5 to 15VDC)
Quiescent current < 10mA
Relay current < 25mA ea.
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
RELAY CONFIG.: Open input = Momentary Crank
(Terminal 6) Grounded input = Maintained Crank
B+ (12VDC) input = Ignition & Crank
Gen. Hz Enable: Open input = Gen. Hz shutdown not active
(Terminal 8) Grounded input = Gen. Hz shutdown active
12VDC input = Generator run Status input,
Over/Under Hz shutdown not active
FREQUENCY INPUT:24VAC, 120VAC & 240VAC 0-100 Hz
(Terminals 9 & 10)
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)
Max Run time (6 hours)
Loss of AC Hz or 12V run status
signal
AMBIENT TEMP:-40 to 858C

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
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APPLICATION 2 - REMOTE RV GENERATOR START CONSOLE REPLACEMENT The GSCM-mini-d can be used
to replace a typical remote
generator control console, that
is mounted on the dash of a
motorhome. Instead of a large
console and cable, use a small
16 to 18 gauge 4 wire signal
cable, an on-off switch with built
in light and a separate 12vdc
fault light. When the remote
switch is turned on, the GSCM-
mini-d starts the generator.
After the generator starts and
comes up to speed the “run”
LED lights on the GSCM 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-d 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.
APPLICATION 3 - GenMate PC BOARD REPLACEMENT The GSCM-mini-d can be used to
replace a GenMate PC Board, that
is mounted on the upper console
of a motor coach. The GSCM-mini-
Duses the same 6 wires that the
GenMate used to start and stop the
diesel generator based on battery
voltage. When the coach battery
voltage falls below 11.5vdc the
GSCM-mini-D starts the generator
to charge the batteries. When the
batteries reach 13.8vdc the
GSCM-mini-D shut down the
generator. An optional manual
start switch can be added to
manually start the generator for
other uses. A power/reset switch
isrecommended to reset any fault
conditions and to shutdown the
auto start when generator is being
serviced. For 24v systems the
GSCM-mini-D must be power from
12vdc and the battery sense input
(terminal 4) would wire directly to
the positive of the 24v battery bank.

GENERATOR START CONTROL MODULE - MINI (2 Wire to 3 Wire) GSCM-MINI-D
ATKINSON ELECTRONICS, INC. REV 07/08
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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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damages or any further loss of any kind whatsoever resulting from the use of our product. The Customer's sole and
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Countries or States that do not allow limitations of incidental or consequential damages or on how long an implied
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All products manufactured by Atkinson Electronics, Inc. are warranted to be free from defects in material and
workmanship in accordance with and subject to the following terms and conditions:
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intent to transfer to a third party is expressly indicated in a purchase order and/or warranty processing arrangements
have been agreed upon in writing by Atkinson Electronics, Inc.
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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a returned product which is not defective or found to be defective as the result of improper use, maintenance or
neglect.
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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.