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Parallel MCB with fuses to feed frequency drives

Nic
46764c050bc7511d6dcb732a28ff5099-huge-img_0667.jpg

Here you can see the frequency drive is connected to the feed via 50A fuses and in parallel with this is a 0.2A MCB. This then powers the frequency drive.

I think the 0.2A is for a pre stop to the drive and the status signal to the DCS. Could someone explain as I haven't seen this before.

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    The drives are connected to ABB variable frequency drives of different kW ratings 1.5kW up to 7.5kW about 10 of them each with there own MCB tray.

    L1, L2 & L3 are permanently live and connected via the tray to the busbars then through an Isolator to the parallel fuses and MCB down to the drive.


    Regards,

    Steven
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  • 0
    The drives are connected to ABB variable frequency drives of different kW ratings 1.5kW up to 7.5kW about 10 of them each with there own MCB tray.

    L1, L2 & L3 are permanently live and connected via the tray to the busbars then through an Isolator to the parallel fuses and MCB down to the drive.


    Regards,

    Steven
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