[davidmb]

Hi I bought a chinese spindle/vfd pair, rated at 2.2kw and the vfd quit after a stall ( went into fault mode, but when restarted it blew - I wasn't sure how long it would last , guess I know now )

Anyway, the spindle is fine, no shorts and all windings measure as original, now I already have a 1.5kw invertek vfd, is it permissable to run the spindle from the 1.5kw vfd ( and yes I know I will be limiting the spindle to 1.5kw max )?

[hub]

Adjust current limit in the VFD settings for a "safe" value that the VFD can handle.

Hub

[mactec54]

Hi I bought a chinese spindle/vfd pair, rated at 2.2kw and the vfd quit after a stall ( went into fault mode, but when restarted it blew - I wasn't sure how long it would last , guess I know now )

Anyway, the spindle is fine, no shorts and all windings measure as original, now I already have a 1.5kw invertek vfd, is it permissable to run the spindle from the 1.5kw vfd ( and yes I know I will be limiting the spindle to 1.5kw max )?

Safely run the 2.2Kw on a 1.5Kw Vfd, no you will kill it in no time, even if you limit the 2.2Kw with settings, the spindle motor won't like that as well, you need around a 3Kw VFD for your 2.2Kw spindle, lots of packages you buy the VFD's capacity is too small, this is one of the main reasons why they fail

[awerby]

If you're running that 3-phase spindle off of single-phase power (which is all that most hobbyists can get) then you need a VFD that's over-rated for the current the spindle draws, to compensate for the loss in conversion. Doing it the other way around - using a VFD that would be too small even if you fed it native 3-phase electricity, is a recipe for disaster.