Regulator for thyristor controlled reversing drive for DC motor - gives short time maximum current demand signal when changing from braking to running

摘要

The triggering of a particular bridge is under the control of a current regulator (5) which obtains speed dependent input signals (7). A supervisory circuit (8) determines direction of rotation, and whether inversion or rectification is required, in response to orders from the operator. If, after inverter operation, a drive instruction exists an additional signal is given to the current regulator. The supervisory circuit (8) connects (81) a biasing voltage (+U) to the current regulator. The magnitude of this voltage corresponds to full current output. This signal rapidly sets the regulator into the correct mode and is independent of the actual reference value of the ordered current. As soon as the rectifier gives a current output the biasing voltage is removed and normal operation resumed.