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GENERATOR START CONTROL MODULE
Engineering Application Bulletin #1 GSCM / 12V-ALT-255Hz
The GSCM 12V ALTERNATOR- 255 Hz Version of the GSCM has had the 'GEN OUT' input section modified for a
5 to 32v AC/DC signal from a alternator AC test point.
The GSCM 12VAlt-255Hz factory settings for Over / Under Hz Shutdown and RUN/Crank Disconnect have changed
to the following:
Over & Under Hz Shutdown - Disabled - Default setting of 0 volts
Run/Crank disconnect factory default setting of 3.91 volts (200Hz)
Input set-up range of 0 - 5vdc = 0 to 255Hz.
Formula to calculate Hz setting is: desired Hz / 255Hz x 5V = Hz voltage @ set-up test point.
Before connecting the alternator test point signal to the GSCM's 'GEN OUT' input, do the following:
1. Run the engine and measure the AC/DC voltage and Hz signal from the alternator's test point. This will
determine how the GSCM is set up. If the voltage is greater than 32VAC, DO NOT connect to the GSCM as
it will cause irreversible damage, an in-line dropping resistor is required for voltages up to 80V. This resistor
connects between terminal 13 and the Hz input wire from the generator, providing the necessary voltage drop
to prevent damaging the GSCM.
2. If the voltage is between 5V and 32V AC/DC and a steady 60Hz signal from the generator with normal
running engine speeds, the Over/Under Hz shutdown can be set to shutdown the generator is the Hz signal
varied outside the desired operating range. (See section 4 - GSCM INITIALIZATION AND ADJUSTMENT)
3. If the voltage is between 5V and 32V AC/DC and a varying Hz signal between 200Hz and 800Hz based on
normal running engine speed, no special settings required. All other setting should work out to the box,
depending on the brand of engine, slight changes may be required to the Run/Crank disconnect Hz, Crank
time, load delay and Pre-off delay times.
Engineering Application Bulletin #3 GSCM / 255Hz
The GSCM-255Hz utilizes the standard GSCM hardware platform, and has had the section of firmware that monitors
the AC Hz. Output of the generator, modified so that the 'GEN OUT' input section looks for 0 to 255Hz signal with AC
voltages anywhere between 25 to 240VAC.
The GSCM-255Hz factory default settings for Over/Under Hz Shutdown and Run/Crank disconnect are as follows:
Over & Under Hz Shutdown - Disabled - Default setting of 0 volts
Run/Crank disconnect factory default setting of 3.91 volts (200Hz)
Input set-up range of 0 - 5vdc = 0 to 255Hz.
Formula to calculate Hz setting is: desired Hz / 255Hz x 5V = Hz voltage @ set-up test point.
All other functions of the GSCM-255Hz programming still function the same as the standard GSCM module.
ATKINSON ELECTRONICS, INC.
Web Site: www.atkinsonelectronics.com
Distributed by:
GSCM
May 2004
September 2004
REV 8/06