Dear Mr. Steven ;
Refer to the connection’s schematic diagram of the Capacitors to a motor, please note that this connection is not too much used, especially for medium and big Motor’s Power, because it may be cause a risk of “ Self Excitation ”, therefor to avoid that phenomena, we should either change the connection way by using another contactor to supply the Capacitors where the closing of it should be done a few seconds after the transient running state and opining with the main contactor, or take into consideration of the following conditions :
Ic ≤ o.9 x Io
Qc ≤ 2 x P ( 1 – Cosφ )