4qd 4QD-300-36 Instruction Manual - Page 10

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Motor wiring

Motor polarity

As shown M+ is positive for forward direction. It is

usually easiest to connect the motor up without

regard for polarity and, if the direction is wrong,

reverse it later.

11 Control wiring

The control wiring can all be thin: the control connectors supplied are designed to accept 7/0.2 wires and it is

suggested you use this.

Control wiring does not generally need to be screened, unless it passes close to motor or battery wiring.

There is a fuse in the control circuitry - see section 17.

Pre-wired models

Some samples are supplied with multicore cables for

the controls to help the user with prototype machine

wiring. On these colour coding is:

6 core cable

Green

0v (battery –ve)

Blue

Pot wiper

Red

Pot +ve (max speed)

Black

Reverse

Yellow +12v supply

White

inhibit

4 core cable

Yellow battery +ve

Blue

'Ignition' switch

Red

switched battery +ve

Black

0v spare

Red and Black can be used for battery meter or relay

3 core cable

Red

battery +ve (brake solenoid)

Blue

Brake solenoid, switched

Green

Connectors

Connectors are supplied with the controller. They are

'IDC's which stands for 'Insulation Displacement

Connector'. The reason is that you do not need to

strip the insulation from the wire before using it - you

simply push the wires into the connector and squeeze

it closed in a vice or with a pair of parallel jawed

pliers. This is far quicker and more reliable, therefore

cheaper, than either screw terminals, crimps or

soldered connections.

Page 10

Using several motors

Controllers cannot count! The controller will not be

able to tell if you are using one, two or fifty motors -

all it knows is the load it is being asked to bear,

which is determined by the mechanics (mass, speed

and gradient) not the number of motors.

The simplest way of using several motors is to wire

them in parallel to the motor terminals.

Installed models

locating ridge

red

blue

wiper

pot max

green

black

reverse

white

yellow

ignit'n

+24

View of soldered pins

Bulgin 6 pin

chassis mounting male

Colour

Function

Green

0v to pot

Blue

speed

Red

11.5v to pot

Black

reverse

White

+ignition

Yellow

battery +ve

You must however use the correct wire which is

flexible 7/0.2 (7 strands, each 0.2mm).

Nearest US equivalent: 24 AWG (commonly 7

strands of 32 AWG).

It is available in multicore, ribbon or as individual

wires. Wire which is too thin will not make contact.

Wire which is too thick will damage the tines. Single

conductor (telephone cable) wires will soon break

4QD series controller instructions.

The diagram, left,

shows the pin

connections on the 6

way connector

commonly used

with our controllers.