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  1. 14-11-2016 #1
    komatias's Avatar
    Lives in Bristol, United Kingdom.
    komatias
    Last Activity: 06-07-2022 Has been a member for 9-10 years. Has a total post count of 559. Received thanks 61 times, giving thanks to others 12 times.
    Quote Originally Posted by m_c View Post
    No neutral on 3 phase machines is perfectly normal.
    Tripping a 300mA breaker would suggest there is a fault somewhere. First thing to try would be to power it up, then move/shake any wiring you can get access to, to see if that causes it to trip.
    Next thing would be to gradually isolate things in turn by pulling fuses, to see if you can narrow down the fault.
    Tripping an RCD means you have leakage current to ground. This could potentially be fatal so disconnect the machine and test which of the power or signal wires are shorting to the chassis. On my KRV it turned out to be the motor. Took it to be repaired and all it needed was a wash.
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