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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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    You might have to check manufacturers info for the inverter drive??

    I agree with others the type of RCD may not be correct, recently a client had issues with a new refridgeration system that has an inverter drive for the compressor, they were getting tripping of the RCD and loss of freezer stock, the blamed the electrical contractor who had fitted a Type A RCD.


    When I got involved, nothing in the refridgeration companies details, but hidden away on a paragraph of the Danfoss manual, indicated if an RCD was being used with the invertor it actually MUST BE a type B RCD. Contractor fitted a Type B and never any issues since.


    Cheers GTB
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  • 0
    You might have to check manufacturers info for the inverter drive??

    I agree with others the type of RCD may not be correct, recently a client had issues with a new refridgeration system that has an inverter drive for the compressor, they were getting tripping of the RCD and loss of freezer stock, the blamed the electrical contractor who had fitted a Type A RCD.


    When I got involved, nothing in the refridgeration companies details, but hidden away on a paragraph of the Danfoss manual, indicated if an RCD was being used with the invertor it actually MUST BE a type B RCD. Contractor fitted a Type B and never any issues since.


    Cheers GTB
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