Altivar 312 Variable Speed Drives Page 50 Accessories and Options

50 Altivar 312 variable speed drives Output filters, motor chokes, and ferrite suppressors Accessories & Options Output filters, motor chokes, and ferrite suppressors Output filters and motor chokes can be inserted between the Altivar 312 drive and the motor to: Limit the dv/dt at the motor bb terminals (500 to 1500 V/s), for cables longer than 164 ft. (50 m) Filter interference caused by opening a contactor placed between the filter and the motor Reduce the motor ground leakage current The output filter range features LR filter cells. Ferrite suppressors are necessary on ATV312H ppp M2 and ATV312H018M3 to ATV312HU22M3 drives when an output contactor is used. LR filter cell This cell features 3 high-frequency chokes and 3 resistors. The LR filter cell is particularly suitable for: Reducing the dv/dt at the motor terminals Using long motor cables (see specifications table page 51) Motor choke The motor choke is particularly suitable for: Reducing overvoltages at the motor terminals (see length of motor cable in specifications table page 51) Minimizing the current wave, thus reducing motor noise Ferrite suppressors for downstream contactor opening Ferrite suppressors for downstream contactor opening are inserted on the motor cable between ATV312H ppp M2 or ATV312H018M3 to ATV312HU22M3 drives and the output contactor. LR filter U1 W1 V1 M1 3 ATV312H ppppp M1 3 ATV312H ppppp Motor choke M1 3 Ferrite suppressors Output contactor ATV 312H ppp M2 ATV 312H018M3HU22M3

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