Frequently Asked Questions

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Is it possible to adjust the stroke via the vibratory drive unit?

Yes, centrifugal drives (e.g. unbalance drives, exciters, shaft drives) via fly weight setting in standstill. Electromagnetic drives via thyristor control unit during operation.

Is it possible to adjust the vibrating frequency?

Yes, centrifugal drives via optional frequency converter. No for electromagnetic drives.

Is the direction of rotation important for unbalance motors?

Yes, if there is only one drive unit. If there are two drives, normally both drives must work in opposite directions (Exception e.g. spiral elevators).

Are JVM® vibratory drive units available in accordance to the Atex guideline?

Yes, all drives are available according to Atex II 3 G+D (zone 2 + 22). Most unbalance motors “JV” are also listed according to Atex II 2 G+D (zone 1 + 21).

What is the type of protection for the drive units?

Standard unbalance motors “JV” conform to IP 66, unbalance motors “JKA”, electromagnetic and dosing drives IP 65.

Does JVM® offer support when selecting a drive unit?

Yes, as a major part of the JVM® service we gladly offer assistance with regard to all questions about drive types and drive selection.

Is it possible to adjust the centrifugal force of unbalance motors?

All unbalance motors “JV” are infinitely adjustable, the setting can easily be checked on the scale.

What means useful weight or effective weight?

Also called construction weight, it is the vibrating weight WITHOUT drive units. E.g. feeder pan or screening machine.

Do electromagnetic drives require controllers for operation?

Yes, a control unit is necessary. Direct connection to the electrical network is not possible.

Do vibratory drive units require a specific fastening?

Yes, we have summarised the most important details for you here.

Must the real construction weight correspond with the calculated construction weight?

In principle yes. With centrifugal drives, weight differences (only) lead to smaller or bigger amplitudes. With electromagnetic drives differences can damage the vibratory drive.

Is it possible to control the drives by selecting a setpoint signal?

Yes, centrifugal drives via optional frequency converter with the corresponding input. For electromagnetic drives and the corresponding JVM® thyristor control unit this is standard.

What are typical amplitudes?

We have summarised the most important details for you here.

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