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LSC2 LOAD SEQUENCING CONTROLLER  

 

FEATURES

    LSC2 Load Sequencer
bullet1 Up to 6 Stages in one unit
bullet1 Up to 11 stages with slave unit
bullet1 Directly interfaces to low cost logic input thyristor stacks or to contactors
bullet1 Built in Burst fire and Single Cycle Control Algorithms
bullet1 Allows modulating stage oversizing for stable control
bullet1 Stage rotation facility to balance heater usage
bullet1 Algorithms for heaters installed in-line or distributed around a vessel
bullet Galvanically isolated digital inputs and outputs
   


GENERAL DESCRIPTION

The LSC2 load sequencing controller is designed for use with a large process heating system which is split into several banks of heaters, all of which apply heat input to the same heating load. The staging controller balances the required heating demand by switching on the number of stages (heater banks) which most nearly match the demand, and modulating one additional stage to make up the difference. Versions are available with combined relay + logic outputs and all logic outputs. A single analogue output is also provided. Relay + logic types are used with contactor stages + 1 modulating thyristor stage; all logic outputs are used when all the stages are controlled by thyristors. The analogue output may be used to drive one modulating thyristor which accepts a standard analogue input signal if preferred.

The staging technique provides the following advantages:-

  1. On large electric heating systems the load is broken into banks of a smaller kilowatt rating, and the maximum size of load being switched on or off at any one time is reduced. This reduces the magnitude of switching disturbances on supply lines, and is particularly useful where the load represents a significant proportion of the supply capacity.

  2. On systems where the load demand does not frequently vary over a wide range the non-modulating stages may be contactor controlled, and the modulating stage thyristor controlled.

The new LSC2 controller is based on our successful CU02 controller, and includes additional features which have been incorporated over time in various versions of the CU02 controller. It also offers isolated digital inputs and outputs and additional digital inputs to simplify the provision of 'special' versions if required.

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