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Motor Connections

Written by rsdoran

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

Last Updated ( Saturday, 15 March 2008 )

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