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My company had a machine moved from one facility to another.

The machine was fully operational when it was disconnected. It operates on 220V three phase power.

When powered up at the new facility the machine will not run.

Checked incoming power with the disconnect off and there is 220 on all three legs. Turned disconnect on and read 220 across L1, L2, & L3, as expected. When checking to ground L1 & L2 read 220, L3 has no voltage.

What would cause this?

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    \$\begingroup\$ Consider to write the observations without vaque spoken language terms like "with disconnect off", "on a leg" and"across Lx". For example I do not have a slightest idea what actual connections and measurements they exactly mean. Draw an exact schematic which shows exact measurement connections in different cases. Tell also where this happened. Mains AC electricity is delivered differently in different countries. Inside a country there can also be large variations. A competent and qualified local electrician would solve the problem or at least finds what should be fixed in minutes. Hire one. \$\endgroup\$
    – user136077
    Feb 26, 2022 at 22:27
  • \$\begingroup\$ Phase rotation the same at new facility as was at old location? \$\endgroup\$ Feb 26, 2022 at 22:35
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    \$\begingroup\$ What part of the world are you in? Was the old location "delta" or "wye" wired? What was the voltage pole-pole? Same question new location. \$\endgroup\$ Feb 27, 2022 at 5:29
  • \$\begingroup\$ @vu2nan How did you got yourself confirmed that editing 120 to 220 is in accordance with questioner's measurement results? \$\endgroup\$
    – user136077
    Feb 27, 2022 at 9:26
  • \$\begingroup\$ @user287001 - Hi, When the voltage is 220 V after the disconnect switch it cannot be 120 V before it. \$\endgroup\$
    – vu2nan
    Feb 27, 2022 at 10:39

2 Answers 2

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When checking to ground L1 & L2 read 220, L3 has no voltage.

It appears that your new facility has a 220 V 'Corner-grounded Delta' system as that alone would demonstrate the above quoted characteristic.

enter image description here

However, further troubleshooting would be required to ascertain the cause of your machine being inoperative.

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When checking to ground L1 & L2 read 220, L3 has no voltage.

That looks like there are just two phases connected.

Also make sure that they're actually different phases connected. You should read ~380 V in between phases (220 V * √3).

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