VFD with long parameter auto reset time

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Kwolford

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Location
Prineville, Oregon
Occupation
Self
I am running a 3 phase deep well submersible pump (2hp 5gpm) currently from a Weg VFD. Drought conditions create fairly short pumping time before I get an error shutdown on VFD. My Weg VFD only allows for 320 second interval before error is cleared and restart. Does anyone know of a VFD that has a much longer user settable restart (like 12+ hours) so that my well can recharge before pump
 

synchro

Senior Member
Location
Chicago, IL
Occupation
EE
Another thought is to slow the motor up, if you haven’t already. You do need a certain water flow past the motor

Also there is a minimum speed to keep the water film intact in the pump's hydrodynamic thrust bearing. Apparently 30 Hz is a typical minimum operating frequency.
https://www.focusondrives.com/protecting-thrust-bearings-deepwell-submersible-pumps/

A lot of this is well known but there is some interesting info here:
https://oakvillepump.com/blog/2020/...frequency-or-constant-pressure-pump-system-in
 

Kwolford

Member
Location
Prineville, Oregon
Occupation
Self
Use separate TDR and have it start the VFD.
Could you give me a bit of help with wiring this TDR to VFD? I’ve included wiring diagrams for timer and VFD. I get that the s1 and s2 terminals go to 5 and 3 on the timer. Does common go to N (2)? What about L? Sorry, I’m just educating myself on all of this.
 

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