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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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    Running a VSD thru an RCD is often problematic.


    Most contain filters on the front end which create a deliberate current to earth. The manufacturers documentation will often require that a specific kind of RCD is used or maybe even no RCD at all.


    Also bear in mind that the RCD can't 'see' the output (motor) side of a VSD - it can only protect the input side. This is why "but not earthed which should have stopped the tripping" didn't have any effect.


    As to whether the motor should be in delta or star, well, that depends.... let us see the motor rating plate.
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  • 0
    Running a VSD thru an RCD is often problematic.


    Most contain filters on the front end which create a deliberate current to earth. The manufacturers documentation will often require that a specific kind of RCD is used or maybe even no RCD at all.


    Also bear in mind that the RCD can't 'see' the output (motor) side of a VSD - it can only protect the input side. This is why "but not earthed which should have stopped the tripping" didn't have any effect.


    As to whether the motor should be in delta or star, well, that depends.... let us see the motor rating plate.
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