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4QD series controller instructions.
Speed control pot
is essentially the same whether you use joystick or
single ended mode. A 10K pot is suggested, but you
can use any value from 1K to 22K. Higher pot values
will cause the pot fault detection to operate.
Speed control wiring of both modes are shown in the
diagram.
Joystick mode
Forward
Reverse
F
E
D
C
B
A
Joystick (wig-wag) mode and Input
deadband
Factory default positions of the headers are shown on
the features diagram. Mode and deadband interact if
low dead-band is engaged.
As supplied, the controller is set up for ‘single-ended’
mode (speed and separate reverse switch) and high
dead-band.
Mode is changed by moving the ‘header’ J1.
Battery meter
If a battery condition meter is required it can
conveniently be connected to the 4 way connector.
Meter + is internally connected to the ‘ignition’ line -
which is the battery positive, switched by the ignition
switch so the meter is off when the ignition is off.
Meter – is internally connected to battery –.
Top Speed adjustment
This is an optional addition. Either use a switch and a
fixed resistor or use a pot in series with the wiper of
the main speed pot.
A resistor (or a pot) of 62K will halve the top speed.
A 200K pot would give a 3:1 top speed range. The
diagram shows both the pot and the switch plus
resistor but only one should be used.
Alternatively if it better suits the wiring, a resistor
may be inserted in series with the top end of the pot.
10K with a 10K pot would halve the speed. Be
careful not to exceed about 30K pot plus series
resistor or the pot fault circuit may cut in.
High Pot Lockout
The controller is fitted with a protection mechanism
which disables it at switch on if the throttle pot is not
at zero speed.
This safety feature is integral with the controller.
However it can be disabled by bridging out the link
point marked HPLO. Also, the ‘Inhibit input’ forces
the internal ‘Demand Speed’ (which is sensed by the
HPLO function) to go to zero, disengaging the
HPLO so the controller will always start when the
Inhibit is removed.
Voltage Control
All of the inputs on the 4QD controllers are voltage
controlled.
Speed
is controlled by the voltage (0-3v minimum)
on pin E of the 6 way connector. However when
using a voltage you must fit a 10K resistor in place
of the pot between pins D and F or the ‘pot fault
detector’ circuit will engage. This will disable the
pot fault feature.
This enables two controllers to be fed of the same
pot: the common speed pot is connected normally to
one controller and pins E on both controllers are
joined.
Ignition pins can be joined, as can reverse pins.
Speed control
Pot
OR
Switch
Maximum speed
F
E
D
C
B
A
