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New safer standstill monitoring of AC drives

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article image Wieland Electric SVM 4001K monitor
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Treotham introduces the new Wieland Electric SVM 4001K monitors specifically designed for the safe standstill monitoring of all AC drives without the need for any additional sensors.

The 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 1- or 3-phase AC motors. 

The SVM 4001K monitors are 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.

Key benefits and features of the Wieland Electric SVM 4001K monitors include Back EMF; supply voltage up to 690 V AC 3; adjustable threshold voltage; adjustable on-delay time; control of safeguards and interlocks with guard locking and relay outputs (230 V AC/ 8 A); and supply voltage of 24 V DC.

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.

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