Matching a vsd to a motor

[Indy]

Hi,
We have a supplier offering a 22kw motor( approximately 43A). They have offered a Schneider drive ATV630D22N4 Which on the data sheet says full load current of 46.3 A. My question is with regards to sizing the input cables to the drive. Am I correct in assuming we use the 46.3 A which would result in a 10mm cable and 50A fuse?
Thanks

 

[ScottyUK]

Refer to page 60 of the drive installation manual. Maximum input current is 39.6A at 380V.

 

[jraef]

Don't know about your codes, but here in North America we must size the input conductors at 125% of the rated input current. As ScottyUK pointed out, on most drives the input current will be lower than the "rated" current, which is always based on the output capacity.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

 

[ScottyUK]

The 50A fuse seems reasonable, but the cable size should follow BS 7671 allowing for volt-drop, earth loop impedance, installation method, cable type, etc. It might be 10mm², but not a certainty.

jraef,

We don't have an equivalent to your oversizing requirement here, so there's more demand on the design engineer to understand the behaviour of the load and design accordingly. The wiring regulations are largely written around building services installations rather than industrial applications, so some large organisations such as Shell, ICI and the CEGB developed and maintained their own standards back in the 60's and 70's.