Control unit for thyristor supplied variable speed d- c drives

Claim 1

In a control unit for thyristor supplied variable speed d-c drives, in which the output signals of current regulators are fed via input amplifiers to comparators having as second inputs the outputs of sawtooth integrators controlled by synchronizing voltages and where the individual output stages for the thyristors of a thyristor set are addressed by the comparators and where, if needed, a command stage for multi-quadrant operation is further provided and a further thyristor set can be addressed via further output stages and where, furthermore, a speed and/or traction control or the like is selectably superimposed on the current regulator and wherein monit-oring units are provided, an arrangement permitting adaption to different requirements comprising: a) a base unit consisting of a housing rack with a base wiring board at the rear, said base wiring board having at least five connectors for circuit boards and a terminal strip for incoming signals and supply voltages soldered thereto; b) a first circuit board for the power supply and for taking off synchronizing voltages, which can be plugged into a first connector of the base board; c) a second circuit board, having thereon a current regulator, a succeeding input amplifier, sawtooth integrators, comparators, and output stages of a thyristor set, which can be plugged into a second connector; d) a third circuit board, having thereon a command stages for multi-quadrant operation and output stages for addressing a further thyristor set, which can be plugged into a third connector of the base wiring board; e) a fourth circuit board, containing means for providing super-imposed technical functions, which can be plugged into a fourth connector; and, f) a fifth circuit board, having means for protection purposes thereon, which can be plugged into a fifth connector.