Thyristor温度控制器

添加时间：2009-11-30 编辑：读取中…… 阅读：次

Thyristor units are used in all applications where larger resistive and inductive loads haveto be switched, for example in industrial furnaces and in plastics processing. The thyristorunit consists of two thyristors connected in inverse parallel, the isolated heat sink and thecontrol electronics. Thyristor units up to 50A load current can either be snapped onto a35 mm rail or wall-mounted using a mounting plate. Units from 75A load current can onlybe wall-mounted. Depending on the settings of the internal switches, the thyristor unitsoperate either in phase-angle mode with adjustable current limiting, or in burst-firingmode. In burst-firing operation, the start of the first half-wave can be partly cut back topermit operation on transformer loads. A subsidiary control, which can be selected as U2,P or I2, ensures that fluctuations in the supply voltage do not affect the control loop duringthe process. The control range can be restricted by attenuating the input signal, and abase load can be set using an external potentiometer. An economy circuit can be used onmulti-phase loads in burst-firing operation. In phase-angle operation, the phase angle setby the controller is approached slowly, starting from 180 degrees, in order to avoid highinrush currents (soft start). The thyristor units conform to VDE 0160 5.5.1.3 (5/88) and VDE0106 Part 100 (3/83). The unit has to be grounded in accordance with the requirements of the local power supply authority.