4QD controllers Service section and technical information
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Background

There are really two main differences between a reversing and a non-reversing controller:

1. The reversing controller has, integral to it, some means of reversing the current.
2. The reversing controller has some means of making sure that the motor current can only reverse when it is effectively zero.

For more information on reversing see Guided tour of controller features and Answers to FAQs on Battery Motors & Controllers.

NCC, Pro and 4QD series all as standard use dual-ramp reversing where the reverse signal (normally a switch) when it is operated causes the controller to decelerate to zero speed and only then to reverse and accelerate in the other direction.

However the DCI-111 has ramps on its input and to change direction the input pot (or voltage) has to be changed from one side of centre to the other. When this is done, the DCI ramps from one setting to the other and only changes the direction signal as it passes zero. So it is impossible for the DCI to change direction at any point other than at zero speed, therefore the controller logic which only changes the direction at at zero speed is not required.

This page describes how the DI could be wired with, for instance, two XLP-500 for a complete reversing system.

0v (pin F) and +Vcc (pin A) are fed from the XLP-500 6 pin connectors as shown. Speed signal (DCI pin E) feeds the speed signal to the XLP-50.

The DCI's direction signal is used to drive a reversing contactor: suitable devices are used in the fork-lift truck industry so are readily available. The contactor will, of course, require a suitable driver circuit and that shown in the Modular Relay System could be used, with the PNP driver transistor chosen to suit the current and voltage requirements of the contactor coil.

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