VFD - Cable distance limitation

[jay pai1]

I have a 10HP/15FLA/480V/3ph pump being controlled off of a VFD, the distance between drive and pump motor is 1600'. I am installing filters and reactors. Any issues with drive performance at this distance? Going to specify #2s due to voltage drop and run THHN.

 

[Dzboyce]

Up to 1,000 ft I usually use a TCI V1K dv/dt filter. Longer than 1,000 feet, you need to be using a sine wave filter. I use filters from either TCI OR MTE.

#4 wire is adequate for voltage drop. You may want to reconsider using THHN. Are you usiing double jacketed submersible pump cable?

 

[jay pai1]

Plan is to run triplex (direct burial rated) and transition to submersible pump cable. Does sine wave filter get installed on VFD or motor end?

 

[Dzboyce]

The filter goes just after the VFD. Your poco may also require an input filter.

 

[jay pai1]

Ok, appreciate the guidance.

 

[Cable Nerd]

Try to stay away from THHN or any other Thermoplastic insulation when doing VFD systems. Plastics don't do well with current and voltage variations. Think of it as a Hershey bar on the seat of your car in the summer then returned to normal temperature. Use XHHW, RHHW etc..
Reference NFPA-79, it's a legit fire hazard.

 

[ron]

This is a good general reference regarding VFD lead length and needed filters.

https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/variable-frequency-drives/powerxl-dh1-variable-frequency-drives/output-filters-and-motor-lead-length-ap040213en.pdf