VFD with long parameter auto reset time

[Kwolford]

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

 

[ptonsparky]

Use separate TDR and have it start the VFD.

 

[Kwolford]

Use separate TDR and have it start the VFD.

Was thinking of that option using a mechanical hot water heater timer that supplies power to VFD every 12 hours for 2 hours. Current VFD is very old so have to replace soon and wondered if there was one out there with Long delay built in.

 

[ptonsparky]

Another thought is to slow the motor up, if you haven’t already. You do need a certain water flow past the motor

 

[ptonsparky]

Was thinking of that option using a mechanical hot water heater timer that supplies power to VFD every 12 hours for 2 hours. Current VFD is very old so have to replace soon and wondered if there was one out there with Long delay built in.

Generally, you should cycle the control input, not power to VFD.

 

[Kwolford]

Another thought is to slow the motor up, if you haven’t already. You do need a certain water flow past the motor

Thanks…I’ll try going from 60hz to 50 and see how much longer I can run without tripping the VFD for motor protection.

 

[synchro]

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]

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.

 

[tom baker]

Per forum rules we are unable to assist with DIY questions