The VTX is the surface-mount version of the very successful NCC, which it replaces.
4QD's 'VTX' series are full feature Four Quadrant (acceleration and regenerative braking, forward and reverse) motor speed controllers for 12v, 24v and 36v battery operation. The range is economical enough for toy cars, yet powerful enough for use in golf buggies so it provides a very cost-effective solution for virtually every application which requires a reversing motor controller in the current range up to 750 amps.
Some possible applications are:- robots, invalid 'scooters', golf buggies, miniature railways, kiddiecars, floor cleaners, caravan shifters and vehicle loaders. The VTX-40 is the baby of the range, covering currents up to 50 amps. For more demanding applications the VTX-75 will give currents up to 100 amps. It is also possible to couple two controllers can be coupled so the two motors work as one, but with independent current limiting, giving control of currents up to 200 amps. This feature is popular with miniature railways where two engines are 'double headed'. All models are available in 12v, 24v and 36v versions.
The VTX series are based on our tried and tested NCC series and are technically advanced and packed with useful features without the 'high tech overkill' which is often used as a sales gimmick. The controllers have been extensively 'value engineered' to give the best possible ratio of performance to cost. Of special interest are the independent, linear, adjustable acceleration and deceleration ramps, the 'dual ramp' automatic reversing, the thermally sensitive overcurrent limiting, the regen current limit, pot fault detection, ramp down at power off, reversing at zero demand speed and automatic reverse speed reduction.
The controllers are open card, for installation in your own housing. Boxed versions are available.
| Supply voltage | 12v, 24v, 36v | depends on model more information. | |
| Supply voltage range | 80% to 150% of nominal | ||
| Supply current | 25mA | at zero speed | |
| Output voltage | 0 to 100% full speed | adjustable | |
| Output current | VTX-40 | 55A (50 amps regen) | Limit, typical |
| VTX-75 | 110A (100 amps regen) | Limit, typical | |
| Overheat current | 20 amps typical | VTX-75, current when sensor has activated | |
| mV drop at 20 amps | VTX-75 | 100mV | typical |
| VTX-40 | 200mV | typical | |
| Switching frequency | 20kHz | approximately | |
| Size | 153mm x 78mm x 40mm | ||
| Weight | 260g | ||
| Input | 2k to 20k pot or 0-3v | adjustable | |
| Reversing input threshold | 5v | approximately | |
| Pot fault detect | greater than 25k | ||
| Acceleration time | 100mSec to 5 Sec | adjustable | |
| Deceleration time | 100mSec to 5 Sec | adjustable | |
The diagram shows the features of the controllers which are assembled, fully tested and guaranteed.
Input is suitable for a standard 10K potentiometer. There is an on-board adjustment to alter sensitivity to suit different operating mechanisms. A connector is supplied. Various speed controls can be supplied as extras, including a spring-return-to-zero speed pot arrangement suitable for hand operation.
The circuit has fully automatic regenerative braking where most of the braking energy is returned to the battery, giving greatly extended use between recharges. With a regenerative brake the motor acts as a generator during braking. At zero speed the motor isn't moving, so actual braking effect is zero, until the motor starts to turn. Regenerative braking can't therefore always replace a mechanical brake since it doesn't work well at slow speed. The circuit therefore optionally includes a driver for an electromagnetic parking brake.
You can buy with confidence as the controllers come with a detailed instruction manual and 4QD give full technical service and advice, offer a fixed price repair (when not covered by the 12 month guarantee).
* these features are fitted as standard on the VTX-75 but are optional extras on VTX-40.
4QD offer a very significant discount for high volume orders. The design is well tried and tested and is almost completely 'bullet-proof' so it is ideal for OEM use. Please enquire (use the contact button at top or bottom).
Bespoke controllers, based on the technology, are of course possible and we welcome such quantity enquiries.
Several options are available. These are listed and marked:
C - on board (user configurable)
F - factory options which must be specified at time of ordering.
B - options are available for bulk orders only
There are several wiring diagrams available:
| Item | Price List | Add to cart |
|---|---|---|
| VTX-40-12 | Add | |
| VTX-40-24 | Add | |
| VTX-40-36 | Add | |
| VTX-75-12 | Add | |
| VTX-75-24 | Add | |
| VTX-75-36 | Add |
| Description | Order code | Price List | Add to cart | Comments |
|---|---|---|---|---|
| VTX-40 Parking Brake + thermal sensor with new controller | VTX-BRA | Add | RC Expansion Board |
The link on the Description is to the specification.
| Description | Order code | Price List | Add to cart | Information |
|---|---|---|---|---|
| Potentiometer, 10K | POT-103 | Add | ||
| 50 cm pushon tails, pair | T05-066 | Add | Power and Motor leads, VTX-75 | |
| 50 cm pushon tails, pair | T05-046 | Add | Power and Motor leads, VTX-40 | |
| Power fuse holder | FHB-130 | Add | For reverse battery protection | |
| Robot wars interface | DCI-111 | Add | Dual channel interface |
You can download the instruction manual, in PDF format, via our manuals and catalogues page.
These are duplicates of the links above, gathered here for your convenience.
