Northern Lights OGSC300 Operator's Manual - page 18
OGSC300 08/12
12
5 TROUBLESHOOTING GUIDELINES
TROUBLE
POSSIBLE CAUSE
SUGGESTED ACTION
Unit does not operate when
powered to test mode
Power leads to unit are reversed
Confi rm correct wiring for ground and +bat,
and re-attempt testing.
Bad ground connection from engine to
controller unit.
Run wire directly from battery - to the ground
terminal #5 & 6 on controller unit.
Engine starts and immediately
goes into Overspeed shut-
down
Improper Overspeed setting
Verify the Overspeed setting with PC confi gu-
ration software. Confi rm that engine’s governor
is properly calibrated for its intended use.
Engine does not crank
Battery is low or terminals are dirty
Clean terminals and re-charge battery
Crank circuitry wiring improperly
connected
Refer to engine control wiring section and
check crank connections
Bad ground connection from engine to
controller
Run wire directly from battery - to the ground
terminal #5 & 6, on controller unit.
Crank relay damaged or on board fuse
is blown
Check wiring, in line fuse and slave relay.
Replace fuse, relay and re-test controller
Engine cranks but does not
start
Out of fuel
Check fuel level, add fuel if necessary
Ignition control wiring not installed
properly
Refer to engine control wiring section and
check ignition connections
Fuel relay and/or fuse damaged
Check fuel relay and fuse, replace if damaged
or blown.
Engine starts but shuts down
after “Oil Bypass
TM
period”
due to low oil/high temp/Aux
input
Oil/Temp/Auxiliary input wiring improp-
erly connected.
Check wiring for proper connections.
Incorrect programming of sensor inputs. Check programming of oil pressure, engine
temperature and aux input. Ensure that the
sensor type is properly programmed to control-
ler unit (Sender / Switch type)
Flashing Overspeed LED
Speed signal improperly connected,
missing, or damaged.
Check speed signal wiring; replace
damaged speed signal source
Crank output damaged, not working, or
fuse blown on starter output
Check wiring and replace relay of fuse
where necessary.
Starter or starter solenoid damaged
Replace/repair damaged starter or starter
solenoid.
Steady Oil LED immediately
on start-up, without engine
actually cranking or starting.
False speed signal being detected by
controller. This problem can sometimes
occur in installations where there is AC
power from inverters near generator
output lines connected to the speed
signal cable.
Install a small step down transformer between
the speed sensing wires and the generator
output.
If the neutral from the generator output is not
grounded, attach it to ground.
Display Parameter for Tem-
perature, Oil or Fuel displayed
as >>> or
Parameter is >>> ABOVE or
BELOW specifi ed manufacturer sender
range.
If further accuracy is required it may be
necessary to install sender with proper range
specifi cations.
Warm-Up Feature appears
longer than time setting.
Warm-Up Feature time setting does
not begin until the Oil Bypass Time has
expired.
Re-adjust Oil Bypass and/or Warm-Up timing.
Engine cranks immediately
when battery is started up.
GSC300 was in autostart when battery
was disconnected.
Make sure GSC300 is shut off prior to
battery being disconnected.
GSC300 was in autostart and battery
was dead when charger was hooked up
Press off when hooking up charger.
Battery Discharged.
(Low battery voltage alarm.)
GSC300 has a 45 ma load in standby
mode
Use a battery disconnect switch, install
a larger battery, or install a battery charger/
maintainer.