I changed the 1.5KW motor and fitted a Mitsubishi E500 VFD to my lathe. The actual VFD is an FR-E520S-1.5K-EC. Everything was fine for a month or so, but, "out-of-the-blue" I started getting intermittent OV3 errors, with an occasional OV2 thrown in for good measure. Also, from time to time, the fan remained on even when the motor was switched off; previously the fan operated only when the motor was running. I was advised that the OV3 errors would be fixed by the addition of a braking resistor, so I fitted one and yes, the OV3/OV2 errors stopped. Great! But a few days later the fan has again started running with the motor off. It often doesn't run continuously; it runs, pauses, and starts again (sort of "stuttering") and does this for quite a while. No part of the VFD seems at all hot; in fact it doesn't even get warm. Any ideas please?
13 years ago