AC servo motor help !

[Jonathan]

For peace of mind you could increase the size of the capacitors to compensate for single instead of 3 phase.

[rnr107]

For peace of mind you could increase the size of the capacitors to compensate for single instead of 3 phase.

Funny that you mention this... :-) On the PCB there is a foot print for 5 caps but only 4 fitted! Could add an exta one I suppose...

[Colin Barron]

If in doubt as a last resort read the manual provided or if not supplied down load it from the internet or look on the internet to find out how other people have solved the same problem for that particular motor.

[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