4QD-300 front

4QD range: Reversing, 24V – 60V, 300A

£240.00£299.00

The 4QD-200 and 4QD-300 are heavy duty 4 quadrant motor speed controllers for currents up to 300A. They are suitable for larger locos, battery powered vehicles, electric boats, and any application that needs a really powerful controller. They are fully electronic with no internal relays, and have many fail-safes built in for reliable long time use.

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Product Description

The 4QD-200 and 4QD-300 are heavy duty 4 quadrant motor speed controllers for currents up to 300A. The key features are:

  • 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 (center zero) or single ended modes [selected by a movable link).
  • Forward – Off – Reverse push button operation is possible [see article in knowledge base]
  • 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).

Also on board is an adjustable torque limit, which limits the continuous motor current, to avoid overloading smaller motors.

Direction switching and drive / brake switching is entirely electronic so in a vehicle equipped with a 4QD it is quite permissible to change the direction switch whilst travelling at full forward speed. The 4QD will brake, stop and reverse under full control. There are on board ramp controls to separately adjust acceleration and deceleration rates. With maximum rates the controller is very lively!

Output devices are kept in their safe operating area so failures are rare. However 4QD have considered the possible failure mechanisms. Worst would be an output device failing short-circuit so the drive would go to full speed. Such failures normally cause the MOSFET gate to go short-circuit. This condition is normally detected by internal circuitry and shuts the controller off completely and safely. Control circuit failures could be over-ridden by the ignition switch.

Mechanical construction is such that the controller can be mounted in thermal contact with the vehicle chassis, so this acts as additional heatsinking, although this is not normally required.

Please consult the factory for variations to the above specification or for more information.

Specification

Model 200 300
Nominal voltage range 24 – 48
Minimum / maximum voltage 18-66
Motor current A [max] 230 320
Motor current A [1 minute]* 140 180
Motor current A [continuous]*
Reversing Y
Half speed reverse Link selectable
Regen braking Y [can be disabled]
Gain adjustment Y
Dimensions [mm] 250 x 103 x 60 280 x 103 x 60
Weight [g] 1300 1685
Power connections M6 studs M8 studs
Input 5k – 20k pot, or 0 – 3V [adjustable via gain]
Reverse polarity protection N
Overvoltage protection Y [68V]
Under voltage protection Y
Pot fault protection Y [>40k]
Thermal protection trip @95’C
Current limit – drive Y [Adjustable]
Current limit – regen Y
High pot lockout Y
Joystick/Wig-wag input Link selectable
Radio Control Via DMR-203
Selectable dual ramp reversing Y
Pre-select Reversing N
Ramping Acceleration and deceleration adjustable between 0.1S and 5S
Parking brake Y [1A max]
Inhibit function Y
Powerdown state (motor) open-circuit
Tacho feedback Via tacho interface board and mod
Ignition, Electronic Y
Heatsink Integral
Double heading Y
Switching frequency 20 kHz
Quadrants 4

The motor current ratings can be significantly improved by fitting external cooling fans. Please give us a call for more details.

 

 

Support

The manual provides full instructions on setting up and operating the controller. The manual is available in two formats, one for reading on screen, and one for printing as a double-sided booklet:

Adobe_PDF_file_icon_32x32   4QD-200 – Read manual                                                                        Booklet icon  4QD-200 – Print booklet (double-sided)

Adobe_PDF_file_icon_32x32   4QD-300 – Read manual                                                                        Booklet icon  4QD-300 – Print booklet (double-sided)

Inhibit ramp modification

If you want to change the function of the inhibit switch so that it follows the standard deceleration ramp then we have some instructions here.

Troubleshooting

For troubleshooting common to all controllers click here.

We have a page on general fault finding for the 4QD here.

We have a page describing how to test the 4QD base board and MOSFETS here.

There are also a lot of useful articles on the 4QD range in our knowledge base here.

Accessories

You may need some or all of the following

  • A throttle mechanism to control the motor speed.
  • Switches e.g. for ignition and maybe reverse.
  • Control cable to connect the switches and throttle to the controller.
  • Power cable to connect the controller to the battery and motor.
  • Fuses.
  • Connectors.
  • Interfaces e.g. for radio control.
  • Relay board to control lights and horns etc.
  • Battery meter.

Some applications need extra cooling, and this can be provided by fitting an external fan to the case. Full details and results are in this application note.

We can supply just the fan itself or a new cover with one already fitted.

Pictures

4QD-300 no cover
4QD-300 with cover removed
4QD-200 no cover
4QD-200 with cover removed