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Swimming pool 3 phase motor trips occasionally on earth leakage RCD

CliveS
We have a new 4 kW 3 phase pump motor at the local pool which has a new variable speed drive unit attached and occasionally it trips out on the RCD which I assume is 30mAmp .  The connections are star inside the motor but not earthed which should have stopped it tripping.

We are not sure what to do, we could run the motor flat out and delta connect the windings possibly or some suggest disconnecting the RCD as the circuit is completely separate from normal wiring.  Would this option contravene any of our regs?
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    Thanks Chris,Andy and Mike

    The pump starts and runs up to maximum speed and records 5.9 amps on the Variable Speed Drive VSD..  Sometimes it will run for days without tripping and sometimes for only an hour.  We always run the duty pump flat out to get the circulation so I was wondering if we should disconnect the VSD and connect the motor delta which should cure the problem as the RCD is an old AC model.

    Regards

    CliveS
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  • 0
    Thanks Chris,Andy and Mike

    The pump starts and runs up to maximum speed and records 5.9 amps on the Variable Speed Drive VSD..  Sometimes it will run for days without tripping and sometimes for only an hour.  We always run the duty pump flat out to get the circulation so I was wondering if we should disconnect the VSD and connect the motor delta which should cure the problem as the RCD is an old AC model.

    Regards

    CliveS
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