4qd VTX Series Gebrauchsanweisung - Seite 11

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The adjustment presets are identified in the diagram

on page 4.

Gain

Set this so that, at maximum required pot range, the

controller just reaches full speed: this is easiest to do

with the motor unloaded. Set the speed pot to your

required maximum point (e.g. full up) then, listening

to the motor, adjust the preset. It it usually quite easy

to tell when the motor stops accelerating.

Maximum setting of the gain preset will give full

output for about 3v input.

Ramps

The VTX series controllers incorporate linear ramps

to control the maximum acceleration and deceleration

rates. These are user adjustable and, to get best

performance from your machine, you should adjust

them to best suit your application.

Acceleration ramp

This is labelled as 'ACC' on the diagram: it is present

to make the vehicle accelerate smoothly when the

speed pot is increased suddenly, so as to avoid

sudden surges and shocks to mechanical components.

As supplied it is normally at half setting so that the

motor takes about 2 seconds to accelerate. Adjust it

as you require to give smooth acceleration.

Clockwise increases acceleration (reduces time to full

VTX series instructions

10: Boxed Controller

198mm

11: Adjustments

Fuse

Battery+

Motor+

Motor–

6 core

control cable

Battery–

speed), anticlockwise decreases acceleration

(increases time to full speed). If the acceleration is set

too high (anticlockwise) the acceleration may be

limited by the current limit, which does no harm but

means that acceleration is not being controlled

properly, so will be dependent on motor load.

Deceleration ramp

This is shown as 'DEC' on the diagram: it is present

to make the vehicle decelerate smoothly when the

speed pot is reduced suddenly. As supplied it is

normally at half setting (about 3 seconds). Adjust it

as you require to give smooth deceleration. You will

usually find you require a lower setting (more

anticlockwise) for DEC than for ACC. If the Decel

time is set too low (anticlockwise) then the relays

will drop out (and short out the motor) before

regenerative braking has finished, giving a jerk

before the vehicle stops completely. This will also

shorten the life of the relays.

Warning

Be careful not to set the ramps too fast: if reversing is

too fast the relays can arc, causing them to stick and

also shortening their life. This is fully explained on

our www site:

http://www.4qd.co.uk/serv/nccramp.html

locating notch

88mm

red

black

white yellow

View on soldered pins

of Bulgin 6 pin

line mounting female

(option)

blue

green

Page 11