I have chinese 1.5kW spindle with Huanyang VFD. It's air cooled by fan mounted directly to shaft, so it should not run under 8000 RPM. But i installed another auxiliary fan and i want to run it automaticaly when motor runs and RPM drops below 8000. How can i do it?

I've tried following settings:

PD052 Multi-Output 3?FA, FB, FC relay function? = 6 (uniform frequency 1 (PD060) reach)

But that energizes the relay only when i exactly hit the PD060 frequency (+- hysteresis band can be set to 1-10Hz by PD062).

Then i tried "multi pump" feature:



  • PD130 = 1 (number of aux pumps)
  • PD052 = 25 (link pump 1 to relay)
  • PD060 = high freq
  • PD061 = low freq


But that does nothing. I can't get it to work (not sure what VFD model i have, some don't have this feature, but i can set these values, so i guess it's there).

How should i do it? I need the VFD to work like this:

spindle stopped -> RELAY OFF
spindle running at >= 8000 -> RELAY OFF
spindle running at < 8000 -> RELAY ON

(relay has both NO and NC contacts, so it can be other way round)

Do you have any idea, how can i achieve this?