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Motor Connections

Electric Motor Wire Connections

 

Single Phase Connections: (Three Phase--see below)
Single Voltage:

Rotation L1 L2
CCW 1,8 4,5
CW 1,5 4,8

Dual Voltage: (Main Winding Only)

Voltage Rotation L1 L2 Join
High CCW 1 4,5 2&3&8
  CW 1 4,8 2&3&5
Low CCW 1,3,8 2,4,5 -------
  CW 1,3,5 2,4,8 -------

Dual Voltage: (Main & Auxiliary Winding)

Voltage Rotation L1 L2 Join
High CCW 1,8 4,5 2&3,6&7
  CW 1,5 4,8 2&3,6&7
Low CCW 1,3,6,8 2,4,5,7 ---------
  CW 1,3,5,7 2,4,6,8 ---------

Single Phase Terminal Markings Identified By Color: (NEMA Standards)
1-Blue            5-Black                            P1-No color assigned
2-White         6-No color assigned       P2-Brown 
3-Orange      7-No color assigned 
4-Yellow        8-Red

Three Phase Connections:

Part Winding Start:
6 Leads NEMA Nomenclature:
WYE or Delta Connected

  T1 T2 T3 T7 T8 T9
Motor Leads 1 2 3 7 8 9

9 Leads NEMA Nomenclature
WYE Connected (low voltage only)

  T1 T2 T3 T7 T8 T9 Together
Motor Leads 1 2 3 7 8 9 4&5&6

12 Leads NEMA & IEC Nomenclature
Single Voltage or Low Voltage of Dual-Voltage Motors

 

T1 T2 T3 T7 T8 T9
NEMA 1,6 2,4 3,5 7,12 8,10 9,11
IEC 1 2 3 7 8 9

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

 

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