Help Wanted KBIC 240 AC to DC Motor Control

[oldveloParticipant @oldvelo]

[oldveloParticipant @oldvelo]

Hi
Can someone point me in the right direction or post a Wiring Diagram and Parts List for a
KBIC 240 AC to DC Motor Control.
It has a Capacitor across the L1 L2 terminals numbered C6 that has blown out the side and destroyed the label
What is the the values of this capacitor PLEASE

Eric

[Dave AttwoodParticipant @daveattwood58220]

Eric

Circuit diagram (is it C23?) in this article:

**LINK**

Dave

[John McNamaraParticipant @johnmcnamara74883]

Hi Velo

Home page for KB

They have manuals online.

**LINK**

Regards
John

[John RuddParticipant @johnrudd16576]

Ok, I just checked on one of my spare boards and the value is 0.047mfd or 47 nF.

The capacitor is an X class rated item with a working voltage of 275v AC….a replacement needs to meet this spec or exceed it….

[MuzzerParticipant @muzzer]

It's a noise suppression cap but I doubt if it actually does much. And even if it did I expect you could replace it with any X cap you have up to a few hundred nF. Any effect on EMC will be marginal at best although I'd be sceptical about it meeting the conducted emissions limits in the first place.

Presumably the machine still works? Just snip out the remains of the cap and continue using it…..

[AjohnwParticipant @ajohnw51620]

If it actually says 275v AC an alternative marking that is likely to be easier to find is 600v or more polyester type.

The mov next to it should stop this from blowing up but a 275v ac capacitor is a bit close to 240v AC to ensure that it can do it's job. On the other hand the mov may have failed which will be hard for you to check.

John

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[Ian S CParticipant @iansc]

A bit OT, I can remember that when I was about 8 years old, one evening I was in my bed next to the living room(probably with headphones on, listening to my Crystal set), Mum was in the next room with the sewing machine, all of a sudden there was a bang, I got up and went to see what was going on, when I opened the door, there was Mum, sitting back from the sewing machine in a cloud of smoke. The next day Dad told me that the suppressor condenser had blown up and he had taken it out as it didn't effect the actual operation of the machine. The machine was used for at least another twenty years, and there was never a hint of RFI.

Ian S C

[oldveloParticipant @oldvelo]

Hi
Many thanks for the valuable information and help.
Replaced it with 0.047 μF @ 275 VAC. Capacitor and all works perfectly.

Thanks Again
Eric

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