4qd 4QD Series Instruction Manual - Page 13

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In Joystick mode, J2 must be set to the factory

default. However if the Dead-band is set to low in

single-ended mode, then the header J2 must be moved

(or removed) or reversing will not properly operate.

J2 disconnects Joystick direction control so must be

Reverse switch

uses the same connector as does the speed control (on

the top board). Only use a reverse switch if the

4QD-200 is switched to single ended mode.

If you use a reverse switch in joystick mode you will

not be able to go forward when the switch is closed -

both joystick directions will be reverse.

¶ If it simplifies the machine wiring, you may also

reverse by applying battery +ve (rather than 12v) to

the reverse input. Be careful however - a mistake in

the wiring could put battery +ve onto pin 2 of the

¶ Brake solenoid

Motors are available with an electromagnetic parking

brake fitted. This brake is normally on. Power must

be connected to the brake solenoid to release it.

Switching the solenoid is done by optional circuitry

on the controller so that when the controller is

switched off, or not running, the parking brake is on.

This also gives a fail safe, in that if the controller dies

for any reason, the electromagnetic brake will come

on.

The brake connects between battery +ve and 'Brake'

(pin B) on the 3 pin connector. The brake output is

suitable for brake solenoids drawing up to 1A.

Inhibit input

Pin A of the 6 pin connector is an inhibit input.

One typical use of this would be in conjunction with a

switch operated by the hand brake lever. When the

brake is on the switch should short pin A to 0v

(battery -ve) to inhibit the controller. Releasing the

brake opens the switch and the controller

automatically ramps up to the demand speed. This

enables proper hill starting on the handbrake, whereas

other inhibit signals (e.g. switching off the ignition)

will cause the high-pedal lockout to engage.

The inhibit may also be used with a footbrake in

which case it is possible to set the deceleration ramp

to maximum time, when regen braking will have little

4QD series controller instructions.

as supplied for Joystick mode.

It is possible to electrically centre the joystick by

using the 'zero' point indicated on the 'features'

diagram. However - mechanical centring is better and

should generally be used in preference.

connector. This is the internal 12v line and applying

battery +ve here is dangerous. Reverse is engaged if

more than 5v is applied to the reverse line. Maximum

allowable voltage is 60v on the reverse line.

Speed

Reverse

Forward

A spare battery - connection is present in case you

wish to fit a manual override switch. The diagram

shows how a 3 position switch can be used to give

release - brake - normal.

Release

Brake

Normal

effect. The vehicle will now be stopped on the

footbrake. Circuitry in the controller (issue 10 top

boards and later) detects that the vehicle (motor

speed) is reducing faster than the internal deceleration

ramp and automatically ramps controller's internal

demand speed down to match the mechanical

braking.

This feature is not efficient - mechanical braking

wastes energy - but when fitted to, for instance, a hire

fleet of golf buggies, new drivers do not then

experience unexpected braking when they release the

throttle!

Ideally drivers should of course learn to use the regen

braking rather than the footbrake!

Single-ended mode

To brake

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