Parallel MCB with fuses to feed frequency drives

Nic over 6 years ago

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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0 Former Community Member over 6 years ago

Are L1, L2 & L3 permenantly live?

It could be a "pre-charge" circuit, ours used to be internal, we would switch out a high resistance just after the 3ph was applied to the drive, to reduce the magnetising current in the inernal RLC filter etc. as inrush current limiting.
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0 Former Community Member over 6 years ago

Are L1, L2 & L3 permenantly live?

It could be a "pre-charge" circuit, ours used to be internal, we would switch out a high resistance just after the 3ph was applied to the drive, to reduce the magnetising current in the inernal RLC filter etc. as inrush current limiting.
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Parallel MCB with fuses to feed frequency drives

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