New product from Control Techniques

A new product from Newtown based Control Techniques has the potential to cut capital costs on control systems.

The system adds flexibility of operation, the possibilities for added redundancy at reduced cost and can even improve operating efficiency to cut energy costs too!

Originally designed for the crane industry, with the objective of eliminating the need for a separate hoist drive, the Control Techniques SPM Power Selector Switch is the ideal tool enabling designers to add versatility to test rigs or process equipment.

It enables operation over a wide power range, selecting appropriate modules to match the power requirement of any task – and improving operational efficiency too. It can also be used to provide continuous operation in the event of a fault, giving system redundancy for critical operations.

The SPM Power Selector Module, used in conjunction with the Control Techniques’ range of modular Unidrive SPM AC drives, is a multi-way switch for the drive

control cables, with relay outputs to power contactors, enabling the automatic connection and disconnection of Unidrive SPM modules in a parallel drive system.

In a gantry crane, for example, with dual long-travel motors and a main hoist, just two drives could be used instead of three – the drives being switched between travel and hoist duty - giving a major saving on the control system. The power range can be expanded using the same technique – up to 10 modules – again eliminating the need for a separate hoist drive

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Where there is a requirement for test rigs to operate over a wide torque / power range, SPM modules can be switched out of circuit when the output power demand is reduced and, conversely, re-connected as power demand rises. Matching drive capability with motors, not only increases the versatility of the test rig, but also improves accuracy of feedback and reduces losses/improves efficiency thereby saving energy. One master can work with a string of added modules – these are switched in and out from the end furthest from the master – future proofing investment in and the life of the rig, giving the option of increased power at a later date, simply by adding modules.

Many other applications require similar versatility and, where the situation demands constant drive availability, this technique can be used to provide peace of mind for critical processes, with extra modules giving guaranteed system redundancy. In this instance, drives are over-sized to include redundant modules that are available in an emergency.

The Unidrive SPM range of modular AC drives provides flexible power from 45 to 1900kW, allowing engineers to build custom-designed high-power systems using volume produced power modules, with proven reliability and short lead time. The compact, innovative IP20 modules are physically easy to handle and install.