Supply pack voltage to the 1/2 speed terminal using a switch.
The controller will only supply 1/2 the rated voltage and amprage.
The controller will supply voltage and amprage per the programmed settings.
We use it on a toggle switch to control
1.) Backing when hooking up to a pulling sled.
2.) To allow someone not used to the way an electric can act (massive low end torque) drive the tractor
3.) To allow the kids to drive the tractor.
In a golf cart, I believe the terminal was powered by energizing the reversing contactor, otherwise the cart would back as fast as it would go forward.
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