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Thread: CS7 electricity supply

  1. #1
    Senior Member gonzob's Avatar
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    CS7 electricity supply

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Well, it went like this:

    Endeavour Energy sent out a note saying the power would be off yesterday between 8 and 5. We charged up everything and waited.

    By 11.30 the power still hadn't gone off, and I was getting low on roasted beans. "Ah well," I said, "I'll just do a quick roast..."

    So, by 18 mins into the roast it was still at only 170C. "Ah," said I, "I must have buggered up one of the coils in the heat gun, I'll use my good one (more powerful) and finish off the roast manually".

    The power was still on...

    After I finished roasting, the missus said, "can you check the microwave, it's not making the right noise". The sound of things clicking into place occurred in my head. I got out the plug-in volt meter, and was surprised to find that we had only 195V. I rang EE and complained that a CS7 brown out was worse than no power.

    At that voltage you only get (195/240)^2 = 66% of the power. No wonder it was so long to get to first crack! Interesting experience.

    It wasn't until 5pm that we got the full 240V.

    Gonzo
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  2. #2
    Mal Dimal's Avatar
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    G'day Gonzo...

    What you describe, sounds to me as though they had lost a phase in the 3-phase power supply upstream of you.
    Like you said, this can be far worse than no supply at all.

    If at any time, this situation is observed in the future, it is far better to turn off your power supply at the main power board, then wait until the power supply is properly restored.

    This type of situation can cause motor burnout in all manner of appliances, such as fridges, air-cons, central heating, etc...
    Better to be safe than sorry...

    Mal.
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  3. #3
    Senior Member gonzob's Avatar
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    Behmor Coffee Roaster
    Yeah, Mal that was the issue. I think EE did all the right things, and I wasn't complaining. They notified well in advance that the power would be "interrupted", and suggested turning off "sensitive" items like computers and TVs. I guess they weren't expecting (as I wasn't) that the voltage would drop. As you say, the motors are the real problem items for that scenario, not the computers. The voltage was down around 200 for at least 4 hours, and most people would have no idea about not using air-cons, etc.

    I guess it was just an interesting experience that I hadn't had before. I'm just happy my roaster is not broken!

    Gonzo
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