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Why Rotor Resistance Is Used In Siemens Simotras Hd Inverter


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We have a siemens product SIMOTRAS HD inverter for hoist application to control Slipring ring induction motor.

In the rotor circuit rotor contactor is used with resistance boxes. The failure of rotor contactor(Siemens 3TF56) mechanism is more.


My query 1- why the external resistance is used in rotor circuit while we are using inverter????

2- how the life of contactor will be saved?







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