Gain adjustment, pots, and inputs

All 4QD’s controllers work on an input voltage, which is usually derived from a potentiometer.

Gain adjustment

This enables the top speed to be reduced, e.g. in a child’s car where the child is too young to use the full speed range. It also allows the controller to be matched to various throttle devices (e.g. foot-pedal, Bell throttle, twist-grip throttle) and supply voltages.

Fixed Gain.

Simpler controllers which do not include this must be used with the correct value of potentiometer and will normally be supplied correctly set – if we know what throttle device you propose to use!

Voltage control

Full speed is typically given for about 4v input. Gain adjustment usually increases this voltage, to allow for instance 0-12v or 0 to 24v input to be used.

Full Speed adjustment

Sometimes it is useful to have a switch which restricts pot operation to, for instance, half full speed. An example of this might be a mobility aid which is 8mph full speed for road use but must have a switch to restrict the top speed to 4mph for pavement use. The Pro-100 / 150 / 160 / 360 can have their maximum output limited in the programming, and can be switched between modes via an external switch.

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