I need a little reassurance to give me the confidence to power up my VFD and spindle because I feel so unsure about what I have been told previously about the need to derate (or not) with this brand (and power) of VFD.
My spindle is a 7.5hp 24,000rpm 3 phase unit. The label states 18 amps s1 although an online vendor lists it as 20.5amps. My VFD is an eBay Huanyang 10hp unit that states "1ph or 3ph input" and is rated for 34amps (although it doesn't state if this is input or output).
I know it's fairly common to find VFDs with 1ph in / 3ph out with no need for derating for spindles of less than 5hp but I have only seen Chinese vendors claim 1ph input for their 7.5kw / 10hp VFDs and they conveniently leave out any info about the need for derating for 1ph input.
Has anyone here used a 7.5kw Huanyang VFD to power a 5.5kw spindle from 1ph 220v power? If so, did it work properly and are you able to tell me how many amps it draws to output the 19amp 3ph power needed to power the spindle?
If the claim about 1ph input on these VFDs is BS (as all VFDs can be run off 1ph with derating) do they require the same 2x derating as regular 3ph VFDs? I have seen various opinions on derating. Some say x 1.7 and others say you need a 15hp VFD for a 7.5hp spindle. Which is correct?
If derating is required for Huanyang VFDs, would I be safe using the 10hp VFD with my spindle if I limit the speed to 16,500 rpm which is where it reaches 5hp until I can purchase a 15hp VFD?
What problem is likely to occur from using a VFD that turned out to be insufficient for the spindle? I.e. Does it break the VFD or the spindle (or both)? Breaking a $250 VFD is one thing but it's a different level of risk for an $1800 spindle...