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Circuit Board Division
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3
Revised 11/2020
Three Modes of Relay Operation
There are 3 different options for the GSCM-mini-d’s
two relay contacts to be configured:
Momentary,
Maintained and Ignition.
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.K2 energizes for 10
seconds for diesel glow plug operation then, K1
cranks the Starter. On shutdown, K2 momentarily
grounds the magneto. See option 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 option 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 option 3 for
operation description.
If adjustability is required then
refer to the GSCM full function
control module.
LED Indication Description
The GSCM-mini-d has six indication LEDs.
The
Start LED
blinks once every 5 seconds to indicate it is
ready for a start signal. The LED will blink once every 2.5
seconds to indicate its 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 due to maximum crank attempted. A slow
blink indicates an under Hz condition while a fast blink
indicates an over Hz condition if pin 8 is grounded. On
continuously indicates AC present in a non-run condition. A
double blink indicates a start failure condition. Four blinks
indicates generator shut down due to its own fault condition
or lack of fuel.
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-mini is in lockout and must be reset.
The K1 and K2 LEDs
indicate the relay status.
Operational Thresholds
GSCM-mini-d’s fixed operational thresholds:
Crank delay:
5 seconds
Maximum crank:
20 seconds
AC crank disconnect:
45Hz
DC crank disconnect:
Voltage greater than 9VDC
Under speed shutdown:
55Hz
Over speed shutdown:
65Hz
Max auto start run time:
6 Hours
Manual start run time:
Indefinitely
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 auto selects
Relay configuration:
Open input = momentary crank
(Terminal 6)
Grounded input = maintained crank
B+ (12VDC) input = ignition & crank
Fault detection:
Start failure (3 attempts)
Generator stops due to its own fault condition
Fault detection if pin 8 is grounded:
Over Hz condition (10 seconds)
Under Hz condition (10 seconds)
