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Portable HPU Panel overload protection query

Former Community Member over 4 years ago

Hi all, newbie so be gentle :)

Our company has portable 415V hydraulic power units from 7.5 to 18.5kW.

On all control panels there is no short circuit device (MCCB or MCB) only a thermal overload and on nearly half, no isolator. Is this standard for this type of unit? These unit are plugged in to site 415 distribution panels which, I assume, will have generic (at a guess) 32A and 63A outlets. It goes against everything I ever did as a panel wireman.

Any words of wisdom, as I'm being asked to make a new panel for o ne of the units and not sure I'm happy with this setup.

Cheers,

G

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0 Former Community Member over 4 years ago

Cheers all for the insight.

I had already added a phase rotation/voltage detection relay as suggested.

After managing to question one of the suppliers, they now fit local isolation and short circuit protection as standard (as I has suspected they should have been), as whatever provides the protection upstream may not be properly rated to protect the motor in a short circuit situation.

Now I just have to cram 40% more gear in the same size box!!

Cheers again,

Gary
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0 Former Community Member over 4 years ago

Cheers all for the insight.

I had already added a phase rotation/voltage detection relay as suggested.

After managing to question one of the suppliers, they now fit local isolation and short circuit protection as standard (as I has suspected they should have been), as whatever provides the protection upstream may not be properly rated to protect the motor in a short circuit situation.

Now I just have to cram 40% more gear in the same size box!!

Cheers again,

Gary
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Portable HPU Panel overload protection query

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