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Intermittent MCB trip puzzler
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 502676" data-attributes="member: 250"><p>The 'B' bit relates to the MCB's operating characteristics around how fast it will operate in the event of an overload fault.</p><p></p><p>The '16' bit is the current.. ie. 16Amps..</p><p></p><p>Power = Current (Amps) x Volatge.. which in your case, suggests the circuit is only designed for 16A x 230V = 3680Watts.. (just over 3.5KiloWatts)</p><p></p><p>As ProDave says this sounds very low..</p><p></p><p>AND in-rush currents when you amplifier is turning on from cold...</p><p></p><p>Plus the other equipment you have already turned on, could well momentarily exceed the MCB's specification.</p><p></p><p>Once the amplifier has charged up it capacitors the current it draws will have levelled off hence you don't get further problems during the day...</p><p></p><p>You can get a basic impression of how much initial charging is needed for the capacitors..</p><p></p><p>by seeing how long the amplifier can carry on outputting sound after you have disconnected the mains supply..</p><p></p><p>(e.g. use some battery powered device to put an audio signal into the amplifier, then turn the mains off with the audio input still playing.)</p><p></p><p>Often they can continue on playing for what seems quite a while, as the same capacitors that have to initially charge up when you first switch it on...</p><p></p><p>now start to discharge again when they no longer have a mains supply.</p><p></p><p>(not scientific or technical but can give you practical illustration that your amplifier has to store up some electrical charge to prevent your audio output being affected by fluctuations in the mains supply).</p><p></p><p> Guinness </p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 502676, member: 250"] The 'B' bit relates to the MCB's operating characteristics around how fast it will operate in the event of an overload fault. The '16' bit is the current.. ie. 16Amps.. Power = Current (Amps) x Volatge.. which in your case, suggests the circuit is only designed for 16A x 230V = 3680Watts.. (just over 3.5KiloWatts) As ProDave says this sounds very low.. AND in-rush currents when you amplifier is turning on from cold... Plus the other equipment you have already turned on, could well momentarily exceed the MCB's specification. Once the amplifier has charged up it capacitors the current it draws will have levelled off hence you don't get further problems during the day... You can get a basic impression of how much initial charging is needed for the capacitors.. by seeing how long the amplifier can carry on outputting sound after you have disconnected the mains supply.. (e.g. use some battery powered device to put an audio signal into the amplifier, then turn the mains off with the audio input still playing.) Often they can continue on playing for what seems quite a while, as the same capacitors that have to initially charge up when you first switch it on... now start to discharge again when they no longer have a mains supply. (not scientific or technical but can give you practical illustration that your amplifier has to store up some electrical charge to prevent your audio output being affected by fluctuations in the mains supply). Guinness [/QUOTE]
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Intermittent MCB trip puzzler
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