4QD controllers Motor Speed Controllers
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Contents this page

• Introduction
• Specifications
• Ordering information and prices
• Instructions

Introduction

The 1QD is something of a 'special product' - the Uni does everything that the 1QD and 2QD series do, so it was intended that the 1QD series should be discontinued. However, it refuses to die so is often available.

However, for general use, we would advise the Porter or the Uni series controllers.

4QD's 1QD series are motor speed controllers for 12v or 24v battery operation. They are state-of-the-art MOSFET chopper drivers giving fully variable fine speed control. Two versions are available, 1QD-70 and 1QD-35, in 12v or 24v options - 36v and 48v versions are available to special order.

The controller is designed primarily for mobile uses such as heavy golf caddies (or golf trolleys), miniature railways, model cars but may be used for other applications as well. The controllers has special circuitry to reduce heat dissipation making them far more powerful than the industry standard golf caddy controllers.

The controller has been 'value engineered' for high volume users but we have taken great pains to ensure that the 1QD is technically as good as possible. It is a circuit board suitable for mounting inside a diecast aluminium box. It is highly efficient, minimising losses, maximising battery life and giving excellent fine speed control. It are fully protected against overload and a thermal cutout is available as an option (on quantity orders) making the unit virtually indestructible.

Specifications

• High speed circuit
• MOSFET chopper
• Half Bridge
• Fast drive current limit.
• Acceleration ramp.
• Over temperature cutout (optional).
• Reverse polarity protection by an on-board relay.
• Electronic Ignition - Auto
• Power Capacitor
• Fixed gain.
• Pot fault protection (voltage)
• Input is suitable for a standard potentiometer. Various speed controls can be supplied as extras, including a spring-return-to-zero speed pot arrangement suitable for hand operation.
• Power and motor connections are by standard 6.3mm push-on connectors. Pre-crimped wires can also be supplied as an optional extra.
• The circuit has excellent low speed control and goes from zero to full speed, when the circuit stops chopping and is fully on.

Construction: the controller consists of a circuit board with an aluminium heatsink mounted vertically at one end. The heatsink forms the main mounting so that the mounting or box gives additional heat dissipation.

The control range from the speed pot can be factory set either full scale to use the full 270° rotation of a standard pot, or it can be 1/3 full scale, using only 90° of the pot, making it suitable for twist-grip type speed controls.

Will fit in to an industry standard diecast aluminium box

Ordering information and prices

The 1QD series are really 'Special Products' now - contact our sales department if you have a quantity requirement (generally 10+ pieces), though we do frequently have singles in stock. The commonest version is the 1QD-35-12.

Instructions

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

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