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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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    Removing the RCD is not sensible without chacking the cable type and routing, the maker's instructions, and the type of earthing used on the site.

    However some types of RCD are over sensitive to short term events, others are less so.
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    Removing the RCD is not sensible without chacking the cable type and routing, the maker's instructions, and the type of earthing used on the site.

    However some types of RCD are over sensitive to short term events, others are less so.
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