Convertor Module

Convertor module is used in all systems. It is also available as a non-enclosed function module for the current range 40—1400 A.

The convertor module is a complete unit which has been tested for correct operation. It is made up of thyristor unit and convertor control equipment. The convertor control equipment, in other words the electronic control circuits, consists of circuit boards mounted on a hinged panel. On con-vertor module 40—400 A the panel is supplied fixed in position; for the 650—1400 A module it is supplied separately.

Fig 1. Convertor module

The convertor control equipment is located on the inside of the panel. The permanent basic functions are grouped on one circuit board known as the mother board. A number of optional functions in the form of small circuit boards can be connected to this mother board.

Mounted on the outside of the hinged panel is drive control equipment. The sub-functions are in the form of circuit boards connected to a mother board which provides all the internal connections between the sub-functions. Drive control equipment communicates with the convertor control equipment via a flat cable.

A convertor module can be fitted with all the options available for the convertor control equipment and the drive control equipment. N. B. The open-core transformer for earth fault protection is supplied as a separate unit.

For supply voltages up to and including 500 V, the primary voltage of the auxiliary supply transformer is the same as the supply voltage of the convertor module. Where the supply voltage, is higher, the transformer must be supplied separately with 500 V 60 Hz or 460 V 60 Hz.

For rated currents 230 A and above, an external supply at 110 V 50 Hz or 115 V 60 Hz is required to power and operate a cooling fan.


Fig. 2. Simplified block diagram