Thyristors power controller PR3-DIN series

burstthree-phaseDIN rail

The PR3-DIN range of thyristor stacks provides full seamless control of three phase electric heating loads from a BMS or similar controller. These burst firing controllers use zero volts switching technology, to minimise RFI problems. A 12kW or 18kW model is available for a typical ac voltage supply of 415V using the two-thirds control technique. Both models have the same features that include:- DIN rail mounting capability; dc voltage signal control; temperature trip with automatic reset, alarm output and LED ‘OUTPUT-ON’ indication; easy access to internal signal & power terminals; no additional heatsink is required for each power rating. APPLICATIONS Suitable applications include electric heating coils, heating cables and electric furnaces. FUNCTIONS Cycle Time and Signal Rescaling The cycle time is preset. A 0 to 10V DC input signal of 5V equates to the load being at 50% ON and likewise with a load of 2.5V the load will be 25% ON. A 10v input signal will therefore equal 100% i.e. fully ON. CAUTION: Adjustment of the cycle time and signal rescaling is possible using HD3, HD4, VR1 and VR2 but is not normally required. Incorrect settings of these controls can cause an overload condition, failure and permanent PR3-DIN –series damage. DO NOT ATTEMPT TO ADJUST THESE CONTROLS WITHOUT REFERENCE TO THE SUPPLIER/MANUFACTURER. Manual Override The PR3-DIN series are supplied preset to the auto ‘A’ position. It is possible to manually override the input signal by placing the HD2 jumper plug in the ‘M’ position.