The HSV relay controls the speed （or, more strictly speaking, the operating rate, or frequency） of a process （moving walkway, conveyor） using discrete sensors
It can be used to monitor under OR overspeed
Control of overspeed, underspeed, operating rate, stopping Measurement via discrete sensors - 3-wire PNP or NPN, Namur, voltage 0-30V or volt-free contact type Works with either NO or NC sensors Time between pulses adjustable from 0.05 s to 10 min
Power-on inhibit time, adjustable from 0.6 s to 60 s Inhibit time can be managed via an external contact
