AC servo motor help !

[GEOFFREY]

Assuming those caps and the "spare" are all in parallel adding another will increase the capacitance, so should do no harm. G.

[m_c]

grinorfrown?

[rnr107]

If you do add another capacitor, make sure it's a similar spec to the ones already fitted, and that it's capable of a pretty large ripple current i.e. don't go for the cheapest one you can find, as if it can't handle the ripple current it'll overheat and go pop pretty quickly.

Yes... I thought so... There must be a reason why this particular model of cap cost over £30 where you can find some of same value for less than £5.00 ! :-)

All caps are in parallel...

But, anyway I am pretty sure wiring the way I did (N, L, L) gives exactly the same work load to the caps and rectifiers as using 3 phase.

[m_c]

smilesmile