Page 5
VTX series instructions
The VTX series are designed for mounting via the
heatsink as in the diagram below. In most
applications, full current is only drawn for short
periods so little heating will be experienced.
However, the VTX’s heatsink is a thick block of
aluminium which won’t cool down quickly to the air.
In more demanding applications, good heatsinking is
important, such as a suitable metal plate which will
usually be the vehicle’s chassis. If heatsinking is
inadequate, the controller will give reduced
performance, and if allowed to overheat for too long,
may be damaged. The heatsink is completely
electrically insulated.
Mounting holes in the heatsink are tapped M4. Do
not drill these out larger. It is unnecessary and you
will contaminate the board with swarf, invalidating
any guarantees.
We recommend mounting only by the heatsink.
However if you want to use the corner mounting
holes as well, you must use insulating mountings.
Whatever you do, make sure the controller can’t get
wet and, if it does, don’t connect the battery until you
have dried the controller thoroughly. The water won’t
cause damage unless the unit is connected to the
battery, when electrolytic corrosion will occur.
Overheat temperature
95°C
on heatsink
Overheat current
20 amps
typical
Switching frequency
20kHz
approximately
Size
153mm x 78mm x 45m
Board version
198mm x 88mm x 43mm
Boxed version
Weight
260g
Input
2k to 20k pot.
Pot fault detect
greater than 25K
Input voltage
3v to 20v for full speed
adjustable
Acceleration time
100mSec to 5 Sec
adjustable
Deceleration time
100mSec to 5 Sec
adjustable
Ignition input threshold
8v into 50k
approximately
Reverse input threshold
5v into 10k
approximately
Parking brake
1 amp max.
Thermal Sensor
Pot and direction switch via IDC connector.
Customer's heatsink
Main capacitors
Relays
6.3mm tags for battery and motor
Heatsink
7: Mounting
