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A 12 lead motor is common for dual voltage, wye-delta starting. The nameplate diagram is what I would normally expect to see expect for the low voltage delta connection. Your diagram depicts the higher voltage delta connection.
if a motor is wired internally delta it will run as designed, in this diagram you would have (t1,12) (t2,10) (t3,11) if the motor is internally wired for wye start delta run, you could set up so you can use it that way as reduced voltage starting, but the wiring diagram should show delta connection (L1,T1,12) (L2,T2,10) (L3, T3,11)(4,7) (5,8 ...
The final connection of the motor is ultimately the responsibility of the installing electrician. If he has any questions, he should contact his nearest motor specialist prior to energization." The above paragraph was stated in a manual for a 12 lead dual voltage motor. The motor was first wired up as a wye. The vfd would fault for phase lost.
Re: 12 wire motor termination hi voltage series connection for 12 lead delta is 4&7 tied,5&8 tied,6&9 tied. Lines to 1&12,2&10,3&11. Low voltage parralel connection is Lines 1&6&7&12,2&4&8&10,3&5&9&11. This is the standard NEMA connection for 12 lead delta for normal across the line starting. Hope this helps and if you need further help send me ...
Also six of the windings generally come out and are tied together in pairs. The switching contactors simply switch the phasing of the second set of leads. Not open for further replies. We have a 12 lead motor with the namplate listed as 440/480V. It lists 440/480V and then is followed by wye/delta.
For a 12 lead motor there are four potential configurations: Low voltage delta Low voltage wye High ...
The rest of the notes from that project, switching 12) wye/delta motors from low volt to high volt and changing the overload relays to suit. Take special note of the second drawing, where it says to swap the winding connections, when using the wye/delta control, otherwise the motor will change directions at the switchover, at full speed. Could ...
So first, make up the 12 leads in the motor peckerhead to the "High" part of the top diagram. then take the 6 leads to the starter and connect them to the terminals as shown in the lower diagram. If your starter has "T1,2,3 and 4,5,6" instead, then U1 = T1, V1 = T2, W1 = T3, U2 = T4, V2 = T5, W2 = T6.
There are 2 standard ways to correctly wire a 6 lead motor. There are about two dozen ways to wire it up total. Some work, some do nothing, some destroy it. Follow the book every time. On six lead single voltage motors watch out and check the manufacturer diagrams. Most use the high voltage wiring diagram only. But at least one (Toshiba) does not.
That's exactly opposite of what the connection diagram on the motor is telling him... The diagram on the motor is typical of an IEC dual voltage motor, designed for 230/400V 50Hz in which the motor is connected in Y for the High voltage and Delta for the Low voltage. The 400V 50Hz connection will work fine for 480V 60Hz. What I was saying is ...