Buying Used Industrial Equipment Online: A Checklist

The questions worth asking a seller before you order a used VFD, HMI or instrument: condition, testing, and what “as-is” really means.

Buying used industrial equipment online can cut lead times from months to days, and it is often the only way to replace a discontinued drive, HMI or instrument. The risk is in the details: a listing that looks right can still be the wrong revision, a unit with a hidden fault, or a part that leaves you without support. These are the questions worth asking before you order.

Is it the exact part number?

Start with the full part or catalog number, not the product family. Drives, HMIs and instruments are sold in many variants that differ by power rating, voltage, communication option or display size. Ask for a clear photo of the nameplate and compare it character by character with the unit you are replacing.

Are the photos of the actual unit?

Stock images show what a product should look like, not what you will receive. Real photos of the actual unit show its physical condition, any missing covers or terminals, and the label with the part number and revision. If a listing only has a manufacturer image, ask the seller for real photos before you buy.

What does the condition really mean?

Condition labels are not standard across sellers, so read the description, not just the label. These are the terms you will see most often:

New Unused, usually in the original packaging	New, open box Unused, but the packaging has been opened
Used, tested Removed from service and function-checked	Used Removed from service, condition described in the listing
As-is Not tested, sold without any promise that it works	For parts Known to be faulty or incomplete

How was it tested?

“Tested” can mean anything from powering the unit on to running it under load. Ask what was checked. For a VFD, did it power up without faults and run a motor? For an HMI, does the touchscreen respond across the whole display? For an instrument, was the output signal checked? A good seller will tell you exactly what was done and disclose any known faults.

Firmware, software and licenses

Drives and HMIs run firmware, and HMIs often need a project file and a specific version of the configuration software. Check that the firmware version works with your software and that you have a copy of your existing program or parameters. A used unit normally arrives without your application loaded.

Not sure a part is a match? Send us the part number or a nameplate photo of your existing unit. We will check compatibility before you order, which is faster for both of us than a return.

Packing, shipping and returns

Industrial electronics are heavy for their size and sensitive to shock. Ask how the item will be packed, which courier will carry it and whether you get tracking. For international orders, check who pays import duties and taxes in your country, and read the return policy before you buy, including the return window and who pays return shipping.

The checklist

The full part number and revision match your system.
The listing shows real photos, including the nameplate.
The condition is described clearly, not just labelled.
You know what testing was done and whether there are known faults.
The firmware works with your software, and you have your program or parameters.
Packing, courier, tracking, duties and the return policy are clear before you pay.

Ten minutes with this list before ordering saves most of the problems buyers run into with used equipment.