PRO-150 V1.0 11/18
Page 11
www.4qd.co.uk
7. Inputs
The Pro-150 can work in two modes, single ended or
joystick [aka “wig-wag”].
Single ended is the default mode and means that the speed potentiometer starts at
one end for zero speed and rotates to give full speed. There is a separate switch to
select reverse.
Joystick mode is where the pot centre position gives zero speed. Turning the pot
one way gives forward and the other way gives reverse. Joystick mode must be
programmed using the pot learn feature, see section 10 or our website
knowledgebase.
Throttle Pot
The Pro-150 is optimised for a 10K pot, although any pot from 1K to 15K can be
used. The pot can take many forms; a simple rotary pot, a twist grip, a plunger pot,
a joystick, or any other resistance based throttle device.
It is important to choose the right kind of throttle device for the intended application.
For example, on a ride-on vehicle, it is important that the throttle has a spring
return, so that the vehicle cannot run away with no one at the controls, while on an
electric boat, a friction joystick might be better.
If a pot above 15K or below 1K are used, the fault Pt will be displayed indicating the
pot is out of range. See section on fault finding.
Joystick mode.
A 1K0 resistor should be fitted in the bottom of the pot (pin F) as shown when the
Pro-150 is used in joystick mode.
This is so that the voltage on the
bottom end of the pot is above
zero and full speed in this direction
corresponds to a finite voltage.
This voltage can than go to zero,
(outside the programmed pot
voltage range) under fault
conditions.
If this resistor is not fitted a fault such as a break in the top of the pot or a short
wiper to battery -ve will not be detected and may cause full speed operation.
Input Learn
The standard default performance is optimised for a 10K pot with a switch for
direction (as shown in the wiring on page 7). However, if you are using a different
value pot, or wish to use a wig-way input, or some other combination, or wish to
use a voltage input - the Pro-150 can be easily taught what control system you are
using.
