Sadly I have the same VFD in the same condition. When you search for a replacement, a couple of lessons learned:
1. Don't buy anything you can't download the manual first to see if you can, relatively, easily wire up buttons and a speed potentiometer.
2. Don't expect any of the low cost VFD to meet criteria 1.
3. Some VFD manuals only specify their part number for the braking resistors. But just as often the schematic, the same one that will give the button and potentiometer connections, will show the breaking resistance required. Looks to me that's exactly what the previous owner did and added the fan as extra insurance.
4. Unless you are making lots of quick stops and starts, you probably don't need the resistor. Mine never got warm in regular use. I simply put a simple heat shield over it just so I couldn't get close to it.
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