4qd 4QD Series Kullanım Kılavuzu - Sayfa 16

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17 Fuse

A 'fuse' track is present on the controller: it is on the

base board. It is arrowed on the 'Features' diagram

(page 4). It is there to limit damage to the controller

in the event of an external wiring fault in the ignition

or parking brake wiring.

This fuse does not protect any of the controller's

electronics, nor can it be blown by any fault in the

controller. If it blows, the ignition will be off and the

controller will be dead.

Two empty fuse clips are provided on the board

where a standard 20mm fuse (1.0 amp) may be ﬁtted

if the track blows. These are between the two boards

and the Features diagram has a section of the top

board 'cut away' to show their position.

The track to Pin F of the input connector also acts as

a fuse in the event of damaging earth fault currents

in the pot wiring.

If either track fuses find and repair the cause of the

fusing before proceeding.

Controllers returned for repair with only a fuse track

blown will be subject to a charge for handling, test

and carriage.

18 Fault finding

Most faults are caused by problems in the external

wiring.The controller has many safeguards to restrict

damage if there is a problem and an understanding of

the safeguards should assist in finding faults.

All voltage measurements should be made with meter

negative on the battery negative terminal.

The ignition switch applies battery voltage to pin C

of the 4 way connector. This enables the controller's

internal power supply. Until the internal supply is on

the controller is dead. The internal supply (+12v) can

be measured on pin B of the 6 way connector.

+12v is also applied (via pot fault detection circuitry)

to the top of the throttle pot, pin D, where you should

measure around 11.4 volts.

As the throttle pot is moved it applies a variable

voltage back to pin E of the 6 way connector. But

there is a 'high pedal lockout' circuitry which

prevents the controller taking off at high speed if the

throttle is faulty: this resets itself when the voltage on

pin E falls to zero.

So check that the throttle voltage varies from 0v

upwards. The top voltage may be 11.4 or less (the

gain can be adjusted to compensate) but never more

than 11.4v. This does not apply to the uncommon

Joystick mode where 'zero speed' is about 5.5v.

If the 12v is correct and the pot voltage is altering

from zero upwards there is a fault in the controller.

Most faults in the controller will need attention at the

factory as they require instruments and experience of

such high current circuitry which are not usually

available to electronic repair shops.

Dead or Loss of power

See page 12: "High pot lockout".

Most models include adjustable battery discharge

protection which cuts back the power when the

voltage in the controller drops too low. If this is set

too high for the battery voltage, it will inhibit

operation.

Undervoltage protection cannot tell the difference

between a flat battery and a poor connection or a bad

wire. If the battery wires are too long and thin they

will drop voltage - and this may result in a dramatic

loss of power as the protection cuts in.

This feature may then require the use of thicker

battery wire

Other faults

See our www site. There is a large service section.