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Caledon Controls Ltd
RLS Series for Resistive Loads
These controllers are designed for the control of 3-phase AC heating loads in either burst fire, single cycle burst fire or (3-leg control only) phase angle control modes. The comprehensive user-selectable range of firing modes ensures that the one most suitable for a particular application can be chosen - after trying the different modes if wished.
The controllers accept a standard analogue input control signal. A second analogue input may be used as a manual input (with external potentiometer) or as a power limit input, or the two inputs may be considered as a 'lowest wins' pair. The controllers may alternatively be configured to operate with a 'logic' control signal.
The load may be either 3-wire star or delta or (with 3-leg control only) 4-wire star connected. All types have modes suitable for the control of both resistive and transformer-coupled loads.
The controllers are suitable for use on 3-phase supplies with nominal line voltage between 200V and 480V RMS (phase voltage up to 277V) or between 200V and 690V (phase voltage up to 400V) depending on the voltage rating chosen (480V or 690V). Over this voltage range synchronisation and phase rotation is determined directly from the 3-phase supply via the 3-phase line connections. A separate synchronisation input is provided (using a special adapter) to enable operation on a 24V RMS supply for use on low voltage high current test rigs.
More detailed information is available on our downloads page, and comprehensive information on the available firing modes is in the data sheet for the RLS series thyristor drivers.
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