4QD's are Uni series are Universal - Unidirectional - Unique controllers of unimpeachable reliability suitable for all the usual applications as well as some unusual ones!

Two current ratings are available, the Uni-8 with a current limit of over 100 amps and the Uni-4 with current limit of over 50 amps.

As standard, it includes regenerative braking but this can be disabled on board, or it can be supplied without, subject to a minimum order quantity.

Versions are available for 12v, 24v, 36v and 48v.

It is available as a card or as a boxed unit (order controller plus base, cover and leads).

The Uni is 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 is the automatic ramp down and power off so the controller always stops smoothly and safely even if the ignition is turned off at full speed. Also if interest are the independent, linear, adjustable acceleration and deceleration ramps, the thermally sensitive overcurrent limiting, the regen current limit and the auto switch-off.

• High speed chopping circuit
• MOSFET chopper
• Fast current limit on drive and regeneration.
• Gain adjustment
• Regen braking may be deactivated (factory option)
• Electronic Ignition on pot, with auto switchoff at pot zero.
• Current limit on drive and regen
• Ramps on accel and decel.
• Reverse polarity protection is integral.
• Thermal shutdown.
• Battery discharge protection is not fitted.
• Overvoltage protection.
• 4 pin control connector (supplied) accepts standard miniature stranded cable (7/0.2). Only 3 wires are normally used: fourth pin allows options in external wiring.
• Carefully engineered thermal design maximises output current.
• The integral heatsink should be bolted to an additional heatsink as required. Normally this will be the main mounting to the machine's chassis. The current limit reduces automatically if the controller gets hot, reducing the danger of failure.
• Power and motor connections are by 6.3mm tabs.
• Pre-crimped wires can be supplied as an optional extra.
• May be used with PM, shunt or series wound motors.
• Various options may be selected in the wiring: see Uni wiring

The diagram above show the arrangement of the enclosed controller with heatsink/base (order controller plus base, cover and leads) and 150cm control lead and 50cm 6.0mm² power leads.

A plan view of the uncased controller (board version).

Showing how the board controller mounts onto the base.

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.

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).

Ordering information and prices.

Controllers

Accessories

Instructions

You can download the instruction manual, in PDF format, via our manuals and catalogues page.

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