4QD controllers
Motor Speed Controllers

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Motor speed controller Catalogue and Index of controllers and features

This page indexed 4QD's range of mainly analogue controllers. Our Pro(grammable)-150 is however fully programmable and includes a display and programmer, as well as a sounder which (with the display) shows indication of any faults found in the system.

There is also an archive of obsolete models, for reference only. This can be useful if you wish to identify a controller to be replaced.

The table shows at a glance which features apply to which controllers.
The top row of links are to the controller specifications pages
The left column links are to the features.

 .4QD  .Pro-150Pro-120.VTX .Porter 5Porter 10.Porter 40
Feature.-150-200-300.-150-120.-40-75.  .-40
Current (approx 1 minute).140180240.-150120.3570.75120.35
12v.N  .18 thro 58Y #2.YY.12v thro 68v12v thro 68v.12 thro 47
24v.18v thro 45v  .YY.YY.YY.
36v.   .YY YY.YY.
48v #8.N  .YY.NN.YY.#9
Reverse polarity protection.ext  .YY.extext.YY.Y
Overvoltage protection.Y  .YY.YY.YY.Y
Quadrants.4  .
Reversing.Y  .YY.YY.NN.N
Regen braking.Y  .YY.YsYs.YY.Y
Dual ramp reversing .Y  .#1Y.YsYs.n/an/a.n/a
Pre-select Reversing.N  .#1mod.YsYs.n/an/a.n/a
Half speed reverse .Y  .#1Y.YsYs.n/an/a.n/a
Ramping.A&D  .#1A&D.A & D .A & DA & D.Y
Parking brake.Y  .YY.optY.NN.N
Inhibit.Y  .YN.NN.NN.N
Gain adjustment .Y  .#1Y.YY.NN.N
Joystick/Wig-wag input.internal option  .#1Acc.AccAcc.n/an/a.n/a
Radio Control .Acc  .askAcc.AccAcc.askask.N
Tacho feedback.Mod  .askAcc.AccAcc.askask.N
Ignition, Electronic.Y
Pot fault protection.Y  .YY.YY.YY.Y
High pedal lockout.automatic  .Yign.NN.NN.N
Battery discharge protection.Y  .#1#3.NN.NN.N
Current limit - drive.Adjustable  .#1Y.YY.YY.Y
Current limit - regen.Y  .#1Y.YY.NN.Y
Thermal shutdown (90ĔC).trip  .#1Y.optY.NN.N
Bare board.N  .YY.YY.YY.Y
Box/cover.Integral  .optopt.YY.YY.Y
Heatsink.Integral  .opt #5opt #5.opt .mountingmounting.mounting
Double heading.N  .askopt.optopt.n/an/a.n/a
Powerdown state (motor) .open-circuit  .shortedshorted.shorted .DiodeDiode.Diode
Power connections #6.M6 studs M8.9.5mm9.5mm.6.3mm6.3mm.6.3mm6.3mm. 

Key to Table

Ystandard feature
Ysstandard features, can be disabled on-board by a modification
Nnot available
DiodeDiode allows motor to be wheeled forward but not reverse
askContact 4QD. Feature is generally not available but could be designed in if demand is sufficient.
AccFeature may be added by Accessory board.
extFeature may be added externally to the controller.
optoptional Accessory
n/anot applicable
mod(ification)value may be changed by changing a component
A&Dlinear ramp on Accelerate and decelerate - both independently adjustable.
Aramped Accel only (fast decel) factory set.

Notes #


You can download instruction manuals, in PDF format, via our manuals and catalogues page.

Operating voltages

24v and 36v
All controllers are available for 24v operation. Some will work on 36v as well while other controllers have a 36v version available.
12v operation
A separate page lists controllers available for 12v operation.
48v operation
A separate page lists controllers available for 48v operation.
Higher voltages
4QD do not manufacture controllers for operation at voltages above 48v nominal.

Page Information

© 2001-2014 4QD
Page's Author: Richard Torrens
Document URI:
Last modified: 2013