WYE, DELTA

[Basil]

I have a question that would help me a lot.
A motor wired with the leads labeled 123456.
How does it match to U1, V1,W1,W2,U2,V2.

[roosaw]

All you need is a ohm meter.  The wye or delta scheme has all the ends disconnected so each "coil" (set of coils actually) can be determine by noting that there is a low resistance between two of the wires.  You have three coils (three phase) so you should get three and only three pairs that show low resistance. 
If this is for an alternator there is no phasing issue and all the coils can be treated as individuals that don't interact in an organized way with the others.  If this is a motor then there is a sequence that must be followed and only an inspection of the coils can tell you that without further info.

[Basil]

Thanks for the reply.
I found what I Was looking for.
How does it match to U1, V1,W1,W2,U2,V2.
         Leads                1    2    3    5  4   6

[dave ames]

Hi Basil,

here's a copy/paste of some IEC and NEMA wiring examples.

Three Phase Motors-Single Speed
Nema Nomenclature--6 Leads:

Single Voltage--External WYE Connection
L1   L2   L3   Join
1    2   3   4&5&6

Single Voltage--External Delta Connection
L1   L2   L3
1,6   2,4   3,5

Single Voltage WYE-Delta Connections
Operating mode   Connection   L1   L2    L3   Join
Start   WYE   1   2   3    4&5&6
Run   Delta   1,6   2,4   3,5   -------

Dual Voltage WYE-Delta Connections
Voltage   Connection   L1   L2    L3   Join
High    WYE   1   2   3    4&5&6
Low   Delta   1,6   2,4   3,5   -------

NEMA Nomenclature--9 Leads:
Dual Voltage WYE-Connected
Voltage   L1   L2   L3   Join
High   1   2    3   4&7, 5&8, 6&9
Low   1,7   2,8   3,9   4&5&6

Dual Voltage Delta-Connected
Voltage   L1   L2   L3   Join
High   1   2    3   4&7, 5&8,6&9
Low   1,6,7   2,4,8   3,5,9   ------------

NEMA Nomenclature--12 Leads:
Dual Voltage--External WYE Connection
Voltage   L1   L2   L3   Join
High   1   2    3   4&7, 5&8, 6&9, 10&11&12
Low   1,7    2,8   3,9   4&5&6, 10&11&12

Dual Voltage
WYE-Connected Start
Delta-Connected Run
Voltage   Conn.   L1   L2   L3   Join
High   WYE   1   2   3   4&7, 5&8, 6&9, 10&11&12
  Delta   1,12   2,10   3,11   4&7, 5&8, 6&9
Low   WYE   1,7   2,8   3,9   4&5&6, 10&11&12
  Delta   1,6,7,12   2,4,8,10   3,5,9,11   ------------

IEC Nomenclature--6 & 12 Leads:
Single Voltage WYE-Delta Connections Single Voltage WYE-Delta Connections
oper-
mode   Conn.   L1   L2   L3   Join
Start   WYE   U1   V1    W1   U2&V2&W2
Run   Delta   U1,W2   V1,U2   W1,V2   --------------

Dual Voltage WYE-Delta Connections
Volt   Conn.   L1   L2   L3   Join
High   WYE   U 1   V1    W1   U2&V2&W2
Low    Delta   U1,W2   V1,U2   W1,V2   --------------

Dual Voltage WYE-Connected Start
Delta-Connected Run
Volt   Conn.   L1   L2   L3   Join
High   WYE   U 1   V1    W1   U2&U5,V2&V5, W2&W5,U6&V6&W6
  Delta   U1,W6   V1,U6   W1,V6   U2&U5,V2&V5,
W2&W6
LOW   WYE   U1,U5   V1,V5   W1,W5   U2&V2&W2,
U6&V6&W6
  Delta   U1,U5,
W2,W6   V1,V5
U2,U6   W1,W5
V2,V6   -----------------------------

NEMA Nomenclature--6 Leads:
Constant Torque Connection (Low-speed HP is half of high-speed HP)
Speed   L1   L2   L3      Typical
Connection
High   6   4    5   1&2&3Join   2 WYE
Low   1   2    3   4-5-6 Open   1 Delta

Variable Torque Connection (Low-speed HP is 1/4 of high-speed HP)
Speed   L1   L2   L3      Typical
Connection
High   6   4    5   1&2&3Join   2 WYE
Low   1   2    3   4-5-6 Open   1 WYE

Constant Horsepower Connection (HP is the same at both speeds)
Speed   L1   L2   L3      Typical
Connection
High   6   4    5   1-2-3 Open   1 Delta
Low   1   2    3   4&5&6-Join   2 WYE

IEC Nomenclature--6 Leads:
Constant Torque Connection
Speed   L1   L2   L3      Typical
Connection
High   2W   2U   2V   1U&1V&1W--JOIN   2 WYE
Low   1U   1V   1W   2U-2V-2W OPEN   1 Delta

Variable Torque Connection
Speed   L1   L2   L3      Typical
Connection
High   2W   2U   2V   1U&1V&1W--JOIN   2 WYE
Low   1U   1V   1W   2U-2V-2W OPEN   1 WYE
.............................................................................
looks like we can swap the terminal names like this:
1=U1....2=V1....3=W1....4=U2....5=V2....6=W2

Hope that doesn't muddy the waters more than it helps,
cheers, dave

[SparWeb]

Thanks Dave  (in a "me too" kind of way)

[SparWeb]

Found a nice diagram to illustrate!



(click on the link below the graphic and it will load full-size)

[Basil]

Thanks SparWeb
This post was a problem at work. Had a motor with leads 1,2,3,4,5,6.
This motor was to start wye and run delta.
It took some searching but I did find it.
    U1, V1,W1,    W2,U2,V2.
     1    2    3       5  4  6
Not 1   2    3       4  5  6