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9.01

Speed pot

We advise a 10K linear pot, although you can use

any value from 4K7 to 20K.

The gain adjustment on the

controller alters the amount of

rotation required before full speed

is reached: this allows various

input devices to be used.

The simplest speed control is an

ordinary rotary pot: this won't give

any 'dead man' control as the pot

won't return to zero when it is

released. 4QD can supply a spring

return to zero hand control or a

plunger operated pot (linear

position sensor), suitable for

incorporating into a foot pedal.

9.02

¶ Use as voltage follower

Instead of a pot, the input may be fed from a variable

voltage. 0v (common) to pin F, signal input (+ve) to

pin E. A resistor (10k) should be connected from pin

D to pin F to over-ride the internal pot fault detector

circuit. Zero speed will be for zero voltage input and

full speed voltage may be adjusted (by the pre-set) to

be from 3v to above 20v.

The reverse line may also be operated by a voltage.

With zero volts present controller will operate in

forward. Apply a voltage (any voltage over

approximately 5) and reverse will be selected.

9.03

Ignition (On/Off) switch

Circuitry in the controller switches it off (zero

current consumption) unless pins A and B of the

connector are joined. Therefore a switch must be

fitted.

There are three ways of factory wiring the

ignition:the following notes apply to the standard

controller, not to the RW version.

Do not permanently link these pins. For correct

operation, the ignition switch must be turned on (or

the hand control box plugged in) after power has

been applied to the controller. If the ignition switch

is turned on before power is applied then the ignition

relay may not pull in properly as its operation relies

on the Pro's internal capacitor charging through a

bleed resistor before the ignition switch is closed.

Page 8

Beware of opening the switch when the motor is

running: the motor will brake to a halt more or less

quickly, depending on the deceleration ramp setting.

Speed

Max

Min

Forward

Reverse

Off

this to work properly it is important that the 'Gain'

control is not turned up too far - see section 11.01.

9.04

This feature switches off the ignition if this is

activated with the speed pot other than at low speed

to guard against the vehicle taking off because the

ignition is activated with the throttle depressed.

In some applications this feature may be undesirable.

e.g. with a Joystick Interface when the system will

not power up unless the stick is central at switch on -

this can cause confusion!. It can be disengaged by

simply removing the header marked HPLO on the

diagram 'features' - page 4.

Note: the Trickle Resistor (p.4) may get hot when

HPLO is engaged and a relay may click on and off.

9.05

this can be used to protect the the battery from

damage that could be done by over-discharging it.

To do this, the voltage at the controllers battery

terminals is monitored and the performance is

reduced as this voltage falls.

The level is factory set to a low voltage (about 15v)

so the feature is effectively inactive on 24v

controllers. For 12v controllers the feature must be

totally deactivated by fitting the header marked UVP

in the features diagram (page 4).

To enable UVP on 24v, fit the 12K resistor R

With the ignition off, or even

with the battery disconnected,

the relays short out the motor

so free-wheeling is not

possible. To freewheel

properly the motor should be

disconnected.

The Pro controller has special

circuitry so that, if the ignition

is switched off at full speed,

the motor will be braked to a

stop (under control of the

deceleration ramp) and only

when it has stopped will the

ignition relay switch off. For

¶ High Pot lock-out

¶ UVP (Battery Discharge Protection)

Pro-120 controller instructions

uvp