Some controllers can be used with either a 3 position toggle to give forward/off/reverse or with two push buttons to give 'go forward' and 'go reverse' control.
The NCC series are supplied with this facility as standard and the ignition and reverse work just like this. A speed pot is permanently connected and left set to the desired speed. Then a signal is applied either to the ignition input - when the controller will start up and operate in forward mode, or to the reverse input - when the controller will start up and operate in reverse.
With other controllers it is not quite as simple - one reason is that they have high pedal lockout which prevents the controller working if a demand speed is present when the controller is switched on.
However the 4QD series have an inhibit input can be thus used, but requires a little ingenuity. Details are in an application note.
The Pro series could also be thus used - but only if the HPLO is disengaged (easy - detailed in the instructions) and the power relay operation is altered. This can be done but is a factory modification.
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