ABB 64606859 PROFIBUS DP Adapter Module

ABB 64606859 PROFIBUS DP Adapter Module

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In parallel circuits equalising currents may flow via the auxiliary emitters. These currents increase along with the necessary modification to achieve symmetry of the phase currents. 

For the auxiliary emitters it is recommended to keep the resistors as low as possible. These have the major disadvantage that a voltage drop occurs across the resistors which, depending on the direction of the equalising current, may be added to or subtracted from the gate voltage. 

A unequal turn-on or turn-off of the IGBTs is the result. Should, however, equalising currents of >25ARMS flow in the auxiliary emitters, these currents need to be limited with resistors. Attention has to be given to the pulse current capability of the resistors. The gate resistor is calculated by: R =Rgate +REmitter. As shown in figure 13b, one can also use current compensating chokes. They limit the current in case of non-symmetric currents in the gate- and the respective emitter lead. 

ABB 64606859 Technical drawing:

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