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We identified that the MOSFET (Q3), diode (D5) and the large capacitors (C3, C4) needed replacement on our motor control board. We also had to replace a resistor (R11) which was mark as being 33 ohms but tested at 10K on the board. Ended up replacing this with a 47 ohm through hole resistor.
Had issues with some FAKE mosfets that I bought off Ebay (10 for $8).With the fake mosfets, the mosfets would fail somewhere between 10 and 15 Amps. The motor is rated for 20 amps.
Bought some Infineon mosfets (see below for link) and they worked wonderfully.
Finish Product:
Replacement Parts
| Part | Specification | Original Part# | Replacement Part# | Image |
|---|---|---|---|---|
| MOSFET | Power Mosfet | IRFP260N | IRFP260NPBF |
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| 2x Capacitors | Aluminum Electrolytic Capacitors - Snap In 680uF 200 Volts 20% | LSG681M2D-2540 | LGR2D681MELA40 |
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Resistor I used a 0603 size resistor which was a bit small. Probably a 1206 would be better | 33 ohm Size: 1206 | - | ERJ-P08J330V |
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| Power Diode | Forward Current: 30A, Reverse Voltage: 600V Ultra Fast Diode Fully isolated package | F30U60ST | (IDEAL) |
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RURP3060 with TO-220 insulation Kit (Another Option) |
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Securing Screws
The board originally had an acetone based lacquer application done to the screws to vibration proof the screws.
Could use nail polish or a thread locker (loctite) as an alternative.
I used some nail polish to secure the screws.
Useful Information
Adjusting the Belt
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