4qd Mark 2 Series Gebrauchsanweisung - Seite 9

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shown in the 'Connections' diagram (page 7). For

variable cutback, you could fit a variable resistor. Or

you could use a switch to enable/disable the feature.

The level at which it works is controlled by the value

of the external resistor.

The controller cannot know the difference between a

flat battery and losses caused by very high battery

current in wiring that is too thin, so in some

applications it may have undesired effects. It can be

disabled completely by linking out the pinstrip

marked UVP on the features diagram. Spare

'jumpers links' are available from 4QD (JLK-001).

9.06

Reversing switch

Reversing switch connections are shown in the

diagram (facing). Reversing is 'dual ramp' which

means that, if the vehicle is reversed at speed, it

automatically slows down under control of the

deceleration ramp then, at zero speed, reverses and

speeds up under control of the acceleration ramp.

Whenever the vehicle is in reverse, a speed reduction

circuit operates, so that (if the gain adjustment has

Regenerative motor braking is integral to the Pro

series controllers, but it can be disabled (see section

17). When the demand speed is reduced below the

actual motor speed, the controller starts braking,

returning as much of the braking energy as possible

back into the battery. The rate at which the braking

acts is adjusted by means of the deceleration

adjustment.

For maximum energy recovery, use gentle braking.

Turning the speed control to zero for maximum

braking, shorts out the motor via the relays so there

is then no energy recovery.

Regenerative braking does not work well at slow

speeds, simply because it relies on the motor turning

to provide braking energy. Therefore, if the motor is

only turning slowly it cannot give a lot of braking, so

a vehicle may creep if parked on a hill. To stop this

creeping you can get motors fitted with an

electro-magnetically operated parking brake.

Parking Brake

When power is applied to this, the brake is released

and when power is removed the brake is applied by a

spring. The Pro series controllers have a circuit to

Pro-120 controller instructions

been set up sensibly) full reverse speed is half of full

forward speed.

9.07

As supplied, reverse speed is half of forward speed.

If reverse speed reduction is not required it can be

disabled by moving the 'jumper' on the pinstrip

shown in the diagram on page 4.

9.08

It is possible to disable the 'dual ramp' when

reversing becomes 'pre-select' so that, if the reverse

switch is operated at speed, nothing will happen until

the demand speed is reduced to zero. Reversing will

now occur when the demand speed is turned up

again. In this mode a push switch can be used for

reversing: push the switch as you move the speed

control from zero to temporarily engage reverse and

release it when the vehicle is moving. Then, when

the speed control is again reduced to zero, the

controller will drop back into forward automatically.

To disengage dual ramp, remove the header

indicated on page 4.

10 Braking

A B C

drive such a brake: power is applied to the solenoid

as demand speed is increased above zero and when

the demand speed returns to zero, power is removed.

Parking brake drive is via the 3 pin connector, shown

on the diagram 'Features'. This should be wired as in

the first diagram.

Release

Brake

Normal

The 3rd pin is battery negative so you can use a 3

position switch to give Release—Brake—Normal

(brake override facilities), as shown in the diagram

below.

The brake driver will give 1 amp: if more current is

drawn the controller will shut down.

Half Speed Reversing

Dual Ramp Reversing

To brake

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