Stand­still mon­i­tor­ing of AC drives

DEMM Engineering & Manufacturing - - ELECTRICAL TECHNOLOGY -

The new Wieland Elec­tric SVM 4001K mon­i­tors have been specif­i­cally de­signed for the safe stand­still mon­i­tor­ing of all AC drives with­out the need for any ad­di­tional sen­sors.

This Back EMF safe stand­still de­tec­tion with the SVM 4001K mon­i­tors is achieved by the eval­u­a­tion of the in­duced resid­ual volt­age dur­ing the run down of one-or three-phase AC mo­tors.

The SVM 4001K mon­i­tor is con­nected di­rectly to the sup­ply volt­age con­nec­tions of the AC mo­tor.

If this volt­age ex­ceeds the ad­justed thresh­old volt­age at the ter­mi­nals L1, L2 and L3 of the de­vice, the re­lay con­tacts open in­stan­ta­neously.

How­ever, if the mon­i­tored volt­age falls be­low the ad­justed thresh­old volt­age dur­ing the run down of the AC mo­tor in ques­tion, the out­put re­lay is turned on af­ter an ad­justable de­lay.

The mon­i­tors come with TUV ap­proval and are suit­able for use up to PL e / cat­e­gory 4 or SIL 3. The UL ap­proval for the de­vice is pend­ing.­quiry #D140234c

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