H100 and Rapid Change ATC

after much vexation, I got my RCATC to set a tool. Then I initiated a tool change and it spun out the current tool dead center in the hole, but really really fast. I stopped the program to prevent damage.
I set parameter #31 in my Altmill Gsender to 1200, and verified that 1200 is called for in the macro, but there is some hint that I might need to set a minimum frequency on my Huanyang H100 VFD. Is that so, and does anyone have the steps?
Thanks in advance.

What, nobody knows? Neither did I but what you do is:
on the VFD screen press set. See f000, press set again
arrow up or down from 1 to 0, hit set, see ‘end’
hit set arrow up to f011, hit set, change the number 125 to 20.
hit set, see ‘end’.
hit set, change f000 back to 1, just for safety’s sake.
turn it off, turn it on again after a minute…
My ATC works!

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