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How Do I Wire A Potentiometer To My Pump VFD?

By Dave Rongey - Summary:

The connections for a potentiometer are as follows…

Electrical Question from Eric about Electrical Wiring for a Variable Frequency Drive
Background: Eric, a Handyman from Delta, CO

Question: I have an irrigation pump that is controlled by a VFD. The VFD output can be controlled by a remote potentiometer which I am attempting to install. I have no instructions for the potentiometer. It is correctly sized for this application. The potentiometer has three tabs for electrical connections. The VFD has three terminals for the potentiometer to hook to. They are labeled L (analog ground for excitation), H (DC 10V reference) and O (voltage input for the signal). How do I determine which tab on the potentiometer corresponds with each VFD terminal?

Dave’s Reply:
Thanks for your electrical question Eric.
The Make and Model/Part Numbers of both the VFD and the Remote Potentiometer: VFD – Hitachi L300P450LFU2, Potentiometer – Alpha B1K

The connections for a potentiometer are as follows:
Looking at the pot with the Shaft Pointing Towards You the Tabs would be 1 -2 -3 , Left to Right, Tabs Pointing Down.
Tab 1 is Ground  – VFD – L Analog Ground
Tab 2 is Analog Out – VFD – O Voltage Signal
Tab 3 is Voltage Input – VFD H DC 10V
Eric – I could not verify the information that you have for the VFD, so I’m just providing the Pot Tab Assignments.
This answer is limited to the above mentioned VFD only. The potentiometer connections are standard.

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