4QD Electronic Motor Speed Controller

This was removed from a laboratory where it was previously used for an experiment involving a GO-Kart.

The unit is in good cosmetic condition but has not been tested for function by us.

Some info about the unit from the manufacturer:

• • 4 quadrant operation
  • Gain adjustment.
  • Adjustable acceleration and deceleration ramps.
  • Input by 1k ohm to 22k ohm potentiometer, direct voltage control, or PWM control by Pi or Arduino etc.
  • Regenerative braking [can be disabled].
  • Reversing.
  • Over temperature shutdown.
  • Battery discharge protection.
  • Pot fault protection.
  • High Pedal Lock-out.
  • Inhibit input for interlock with mechanical brake, deadmans handle etc.
  • Parking brake driver with current limit and anti-rollback.
  • Joystick (wig-wag) or single ended modes [selected by a movable link).
  • Forward – Off – Reverse push button operation is possible 
  • Wide operating voltage: 48v controller can be used between 18v to 66v (subject to battery discharge protection setting).
  • Fail-safe, protected circuitry for reliable, safe operation even into a shorted output: no minimum inductance for safe operation.
  • Shut down circuitry shuts drive down safely under all likely failure modes, including internal or battery over and under voltage
  • Reversing speed threshold can be adjusted for operation on hills.
  • Brake Light Driver. Factory option, replaces parking brake (subject to minimum quantity order).