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Macrotech MA3600VZ weird fault |
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kedwardsleisure 
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 2476 |
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 Topic: Macrotech MA3600VZ weird faultPosted: 09 August 2012 at 3:48pm |
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got an interesting one here, wondering if anyone can shed any light.
Crown Macrotech MA3600VZ Fairly new, clean & tidy. Problem is, it throws out the main 20A mcb when it's switched off 
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K. Edwards Electronics Engineers
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Jimmer
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Posted: 09 August 2012 at 4:27pm |
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plug wired back to front?
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levyte357-
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Posted: 09 August 2012 at 4:30pm |
Any day an MA3600VZ is not munching drivers, is a good day.  Edited by levyte357- - 09 August 2012 at 6:13pm |
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freddymendez
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Posted: 09 August 2012 at 5:00pm |
i thought that too! to clarify do you mean when you switch the amp off (when it was previously switched on), or when you connect the amp to mains with it's switch in the off position? |
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120-140 bpm, pianos and bass.
diesel, the fuel of professionals. mendez/manchester |
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ceharden
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Posted: 09 August 2012 at 5:53pm |
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Simple solution: tape over the switch and fit it with one of these fancy True1 Powercons, tell the user to switch it on and off with that!
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kedwardsleisure
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Posted: 09 August 2012 at 6:19pm |
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Thanks, you've all been most helpful!
It trips the mcb as you are turning it off, whether at the front panel switch or at the wall socket. 
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ceharden
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Posted: 09 August 2012 at 8:03pm |
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That's worrying because surely to trip as you turn it off at the wall, it must be causing the switch to arc over?
Some kind of fault with the transformer whereby it's storing a massive amount of energy? Or somehow there is a spike being created on the secondary side and going back through the transformer? Doesn't sound good either way! Have you tried it with the old 100W lamp in series with the mains trick and see what happens when you turn it off? |
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kedwardsleisure
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Posted: 09 August 2012 at 11:29pm |
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Ive had it before with thyristor controlled loads where the thyristors are retriggering due to dv/dt but the 3600 doesnt have thyristor control
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ceharden
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Posted: 09 August 2012 at 11:56pm |
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Does it behave normally when it's running? Any evidence of issues with the VZ circuitry? Must admit I generally avoid the larger Macrotechs, not my speciality.
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kedwardsleisure
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Posted: 09 August 2012 at 11:58pm |
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it works beautifully.
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ceharden
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Posted: 10 August 2012 at 12:23am |
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All I can say is bizarre!
And good luck! |
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VentureSound
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Posted: 10 August 2012 at 5:06pm |
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Perhaps a faulty MCB?
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Jimmer wrote: