Need help with Mitsubishi VFD

Jul 17, 2007 2 Replies
L

I'm in UK and have just purchased a (second hand) Mitsubishi E500 VFD (specifically the E520S) from eBay. I've wired it up to a 220v single phase supply and am controlling it via an external switch and a 1K pot. It appears to work OK but I'm having a problem with getting it to go above 50Hz. The pot will control it anywhere from 0 to 50Hz, but no more. I'm sure its a parameter setting but I can't find it. I've set P1 (max freq) to 120 and P2 (min freq) to zero. All other parms are unchanged from the settings as I received it. All those referring to frequency are set to 50, but none of them seem to refer to a max allowed frequency. For completeness, I've noted all the parameters that are changed from their factory settings and placed them in a PDF at

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from P1 and P2, the only real changes are from the factory setting of 60Hz to 50. Can anyone help please?


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N

I'm pretty sure you need to change parameters 902 and 903 (frequency setting bias and gain) to match the desired frequency range.

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L

Thanks Ned, It didn't work, but it got me thinking about other possible tie-ups. I first tried P20, but no joy, so then I tried P38 (Frequency at 5V input) and that did it. Incidentally, it didn't allow me to change P903 - it seemed to accept the new value at first, but then went into a weird sequence of number displays varying something like 14.3 27.4 14.3 etc before finally giving an error. Its working fine now.

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