Precise controls supplies thyristorised dc motor speed controller in power pack modular construction. The armature voltage is controlled with scr/diode single phase full wave half controlled bridge included in the thyristorised dc motor speed controller. The scr/diodes are protected with rc snubbers and movs. The power semiconductors of the speed controller are mounted on the aluminium extruded heat sink for cooling. The control circuit of thyristorised dc motor speed controller is assembled on glass epoxy, pth printed circuit board. The dc motor speed controller is supplied with highly stabilised reference supply, dual ramp circuit, speed loop circuit, current loop circuit, isolated voltage and current feed back signals. It is possible to synchronise the speed with other drives through encoders. Power packs are available for 7.5 hp motors. The dc motor speed controller comes with three phase full wave fully controlled scr bridges, which are available for power packs up to 100 hp dc motors. The power packs are developed with a high degree of quality control. The spares are available ex-stock. Experienced engineers provide efficient after sales services for the dc motor speed controller from precise controls. Areas of application of the dc motor speed controller are printing machines, machine tools, cement plants, etc.
