I am evolving an existing circuit which has a 230VAC input. The 230VAC has multiple loads:
- Transformer followed by rectifing circuit;
- Small DC motor 3.6W.
There is an X2 security capacitor of 0.22uF across the 230 VAC input.
I am not sure of all the reasons to have this capacitor. Q1: What are the reasons to have an X2 security capacitor?
I suspect that it is required for the DC motor. However, the specification of the DC motor says that it requires a 0.1uF/10% capacitor @230V . Therefore the existing 0.22uF X2 CAP seems to be historical and out of the required range. If this corrects the power factor, then a 0.22uF could overcorrect this.
Q2: How to determine the value of the X2 security capacitor. (Should I change the capacitor to 0.1uF).