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Crest CA 12 pops fuse when startup |
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serioussound 
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Joined: 01 December 2013 Status: Offline Points: 443 |
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 Topic: Crest CA 12 pops fuse when startupPosted: 04 July 2020 at 10:10pm |
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I have 2 Crest CA 12 each of them are hooked up on 10A 220 volts.
If I hit the Power button ”fast and steady” everything is ok. BUT if Im little slow its like the power button is in some kind of middle setting and it then blows the 10A 220v automatic fuse in the room. Is it something wrong with the power button or is this normal since 10A is to small for this amp? The power button is not snapping steady you get the feeling its worn out or something. Any ideas? |
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studio45
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Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Posted: 05 July 2020 at 2:47pm |
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Well, I'd replace that switch if it feels bad.
There could be a fault with the soft-start circuit in the amp - see this thread https://forum.speakerplans.com/crest-ca12-sparking-on-off-switch_topic85098_page2.html - if the soft start relay has failed in the closed position, the amp will draw a very heavy current at startup, which could damage the on/off switch and pop breakers.
Another possibility is that your 10A breakers are too fast for this application. I'm not sure how US breakers are rated but in the UK we have A, B, C and D curves, where A reacts very fast and D reacts more slowly, B and C being somewhere in between. |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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serioussound
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Posted: 05 July 2020 at 3:37pm |
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Ok is it a good chance its only the switch that is bad? I think I here the relay so I think that is ok. |
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 05 July 2020 at 10:22pm |
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The switch on a CA12 is actually a thermal-magnetic circuit breaker, so they're more complicated than a switch. If you replace it, it must be the same type for safety reasons.
Sometimes the soft-start on these crests can fail, usually the NTC's arc across on switch on, so that's worth investigation too. And some household breakers are too sensitive for big amps, always worth trying it on a different circuit. |
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Kevin
North Staffordshire |
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serioussound
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Posted: 20 July 2020 at 5:39pm |
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Hi again do you know if this breaker would be ok also for the 220v europe version of the amp? |
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Digbethdave
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Posted: 20 July 2020 at 7:06pm |
Try rswww. Com for a 230v version
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serioussound
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Posted: 20 July 2020 at 7:29pm |
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I dont understand nothing :)
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serioussound wrote: