Page 8
VTX series instructions
Motor wiring
This is not so critical as battery wiring: too long
and/or too thin wire will cause a loss of maximum
current, will get hot and will waste battery power but
will not damage the controller. However, wire which
is too thick will do no harm either so we recommend
the same wire for the motor as for the battery.
Circuit breaker, fuse, isolator.
A circuit breaker or fuse may be fitted if required.
The main advantage is that it will enable the battery
or motor to be disconnected in the event of an
emergency or for security and it will give a measure
of protection should the battery be reversed.
Suggested fuse/breaker value:
50 amp max for VTX-75
25 amp max for VTX-40
Alternatively, you could fit a breaker in the battery
lead: take care not to increase the wiring length too
much. Also, certain types of breaker can have the
same effect as increased battery lead length.
A breaker in the motor may also be useful: it will
enable you to quickly disconnect the motor in an
emergency. If correctly rated, this can also protect the
motor against overheating due to mechanical
faults.Also with the motor disconnected, free-
wheeling becomes possible.
It is also possible to get a battery isolator switch.
These are normally fitted to lorries, buses and boats
to isolate the battery in an emergency.
Battery condition meter.
Pins A and F (yellow and green on the diagram) are
directly connected to the battery so that you may use
them to connect a battery condition meter.
The drawing shows 4QD's LED battery indicators.
6 way connector.
The mating connector supplied is suitable only
for
the correct size of wire.
Acceptable wire sizes are:
. . . 7 stranded 0.22-0.25mm²
. . . Equivalent 24 AWG (7/32 AWG)
It is an Insulation Displacement Connector (IDC)
which 4QD have chosen because it is so very easy to
use and very dependable. - but only with the correct
wire!
Do not strip the insulation from the wires, simply
push them into the top part of the open connector and
squeeze it closed in a vice or with suitable parallel
action pliers. As you do this the tines of the contacts
bite through the insulation to make contact with the
conductors.
Wire which is too thin will not make contact. Wire
which is too thick will damage the tines.
Do not use single strand (telephone) wire: it will
make unreliable contact and easily breaks.
You can re-open a closed connector by gently
moving the tabs at the sides of the top cover outwards
to disengage the latches while lifting the cover
slightly, one side at a time.
1
1
Open
Closed
1
1
1
D red: Max speed (7.8v approx)
E blue: Wiper
F green: 0v (Min speed)
C black: Reverse
A yellow: +24v to Ignition
B white: Ignition and reverse common.
A
B
C
D
E
F
A
B
C
D
E
F
9: Controls
