Leeson Electric Motors

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Electric Motor Wire Marking & Connections

For specific Leeson Motor Connections go to their website and input the Leeson catalog # in the "review" box, you will find connection data, dimensions, name plate data, etc.  www.leeson.com

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
    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&W5
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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