Why use 24v power for vibration, why we keep always-10 voltage for adjustment of vibration?

IS 24V compulsory for vibration

The output is 0to 24v depending on the gap For most probes, the power needed for it to work is from 20v to 24 v That 10 v depends on what’s your plant spec for instance the gap that we keep on a turbine when doing center lining its - 11.5v. We will not keep always -10.so according to Design it will vary.