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I have a simple question. I'm going to connect a three phase motor.

'Three phase source -> drive unit - > three phase motor'

But between the three phase source, should I connect N with L3, or should I ignore the N line?

The drive's brand is VLT Micro Drive FC 51 Danfoss

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    \$\begingroup\$ Connecting L3 with N will surely give sparks and blow the fuse at minimum, or spew molten copper on you. Please try to understand what you are doing very carefully. I am not an electrician, but I interpret the manual so that for 1-phase you L and N as marked, or, for 3-phase, you connect L1 L2 L3 as marked, noting that there is no neutral connection for 3-phase input. \$\endgroup\$
    – Justme
    Sep 29, 2020 at 8:30
  • \$\begingroup\$ @justme Thank you. I did interprent the manual wrong then. \$\endgroup\$
    – euraad
    Sep 29, 2020 at 8:45
  • \$\begingroup\$ such works should only be carried out by educated, trained and certified persons. You also do not work on your car's brakes - do you? \$\endgroup\$
    – schnedan
    Sep 29, 2020 at 9:38
  • \$\begingroup\$ @schnedan I'm a car mechanic. \$\endgroup\$
    – euraad
    Sep 29, 2020 at 10:13
  • \$\begingroup\$ don't know if this is true for cars, but for truck-brakes you need a extra certificate + regular (2 years) renewing courses... at least in germany. a normal mechanic is not allowed to do that. Its the same with 230V (110V). A normal electrician is not allowed to do such works (only with guidance). You need a special training to accept a installation prior to power it for the first time - and it might be hard, but your question shows: you should not do such works. sorry \$\endgroup\$
    – schnedan
    Sep 29, 2020 at 10:34

2 Answers 2

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The L1, L2, and L3 markings are for using three phase power.

The L and N markings are for using single phase.

You are using three phase, so ignore the L and N markings.

For three phase, the controller doesn't have a neutral wire input.

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Better do nothing before you know more about your motor. Can you post the typeshield of the motor and a picture of the connection board? How are "plattes"set? Even better ask an electrian!

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    \$\begingroup\$ The question has nothing to do with the motor. The confusion is on the VFD power input. JRE's answer is correct. \$\endgroup\$
    – Transistor
    Sep 29, 2020 at 8:58
  • \$\begingroup\$ Also this does not answer the question. \$\endgroup\$
    – Justme
    Sep 29, 2020 at 10:18

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