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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 connections are parallel into the large fuse carrier and then single to the MCB. Very good point maybe a MCB cost less than a 3 phase monitor? We have approximately 10 of these MCC trays that feed our Frequency drives. The first one I saw, I thought there was a mistake so I checked the other trays and got the circuit diagrams to check the circuits, they are all the same. 

    I thought I would share this with the community as this is the first time I have come across this.
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  • 0
    The connections are parallel into the large fuse carrier and then single to the MCB. Very good point maybe a MCB cost less than a 3 phase monitor? We have approximately 10 of these MCC trays that feed our Frequency drives. The first one I saw, I thought there was a mistake so I checked the other trays and got the circuit diagrams to check the circuits, they are all the same. 

    I thought I would share this with the community as this is the first time I have come across this.
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