Hi all, I have done a forum search and not found hat I'm looking for, so have asked the question here.

I am stuck in Saudi Arabia, so no local dealer...
I have been given a motor controller / power supply from a proform crosswalk 365 treadmill. It was wrongly plugged in to 220v a/c instead of 110 v a/c. You really wouldn't believe how many times this happens!

As a result the ceramic capacitor across the mains input is blown (see pic)

If anyone can tell me what kind of value this would be that would be a great help.

Info off the PCB:
MC1200 Rev B.
p/n 203517
also, 212 0505 MC1200-2.4

Thanks

Andrew.

 

I bet it is a MOV overvoltage protection, not a capacitor. Is it right across the power input leads? If you take it out and nothing else is damaged, the device should operate as normal. If it doesn´t then the protection wasn´t enough and you will have much more problems with the board.

 

Hi Kubeek,
Thanks for the swift reply. Are they just rated by voltage then, or also a current limit?

Andrew

 

These are rated for the clamping voltage and peak current or peak energy dissipated. Some shops sort them by size, other by current or other criteria. For example this one looks about right for 120Vac mains, but maybe others will recommend a bit different criteria. http://uk.farnell.com/epcos/b72205s0131k101/varistor-4-2j-130vac/dp/1004315