User manual

23 of 28
6.3 Pull and Hold Coil
Some fuel pumps have two solenoids instead of the normal one.
1. One is called the pull coil and is used to initially turn the pump on.
2. The other is the hold coil and is used to keep the pump on.
The pull coil uses more battery power as it has to handle the initial inrush current. Once the pump is on, the
hold coil is activated and the pull coil is deactivated to reduce power consumption.
The GSC300 crank output can be attached to the pull coil and the GSC300 fuel output can be attached to the
hold coil. When the engine is started the fuel and crank output will come on activating both coils but after
cranking is successful the crank output will turn off de-energizing the pull coil.
6.4 Emergency Stop Switch
If the engine does not require an energized output to stop there are a couple of locations the emergency stop
switch can be placed (assuming normally closed switch):
1. Battery + wire going to the GSC300. This would de-energize the GSC300 causing the engine to
shutdown. It has to be able to handle the cranking current.
2. If a lower amperage emergency stop switch is required it is possible to place the emergency stop
switch on the fuel output wire. This would cut power to the fuel causing most engines to shutdown. A
test would have to be performed to ensure that this is the case.
Note: if you have an Energize to Stop engine the above will not work. In this case the Emergency
Stop switch would have to energize the appropriate device to stop the engine.
6.5 Automatic Start on Low Battery
This applies to newer GSC300 units in production August 2011 or latter (“4.15” or greater in serial
number). On new units the low battery output has been changed to stay on for 5 seconds after a low battery
condition has actually expired. This was changed on request of some customers who wanted to implement an
automatic start on low battery feature.
Implementing Automatic Start on Low Battery Procedure
The customer is responsible for determining the adequacy of this for their application. Dynagen does
not guarantee this procedure will work in all applications.
1. Connect the low battery output to the start/stop input on the GSC300. When the GSC300 generates a
low battery warning this will trigger the remote start and start the generator. The low battery output will
stay on for 5s. This may be long enough for the generator to startup and run. The customer will have
to test this to confirm for their generator.
2. Enable cool-down and set the cool-down time. Once the GSC300 is running and the low battery output
turns off the GSC300 will enter cool down. The time it spends in cool down can be used to charge the
battery. The cool down time can be set up to 13 minutes.
3. (Optional) To increase the time the GSC300 is running (this can be used for older units as well) use a
time delay relay. The low battery output can be connected to the coil of the timed relay. The output of
the relay can be connected to the remote start contact. The battery charge time would then be the
relay delay (plus, on new units, the cool-down time).