SIEMENS
6/11
Siemens MD 50.8 · 2017
Motor options
Mechanical design
Motor connection and terminal boxes
6
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Connection, circuit and terminal boxes
Location and position of the terminal box
The terminal box of the motor can be mounted in four different
locations or positions. The position of the terminal box is always
when viewing the drive end (DE) of the motor.
The standard position of the terminal box (for mounting
position M1) is on the right-hand side, with the cable entry from
below (1A).
The terminal box is always located at the non-drive end (NDE) of
the motor.
Selection data, cable entry
Fig. 6/10
Terminal box position and cable entry
Motor connection
The number of winding ends depends on the winding design.
Three-phase AC motors are connected to the three phase con-
ductors L1, L2, and L3 of a three-phase line supply. The motor
rated voltage in the operating connection must match the phase
conductor voltages of the line supply.
When the three phases operate in sequence and are connected
to the terminals of the motor in alphabetical order U1, V1 and
W1, the motor rotates clockwise when viewing the DE motor
shaft.
The direction of rotation of the motor can be reversed if two
connecting cables are interchanged. Labeled terminals are
provided to connect the protective conductor.
The connections for a brake, anti-condensation heating or
thermal motor protection are also located in the terminal box.
Note:
Different sizes of terminal box are used depending on the
connections required.
Additional notes see “Terminal box type” page 6/14.
Terminal box
position
Position of the cable entry
Order code
Motor
LA63 … 71, LE80 … 100
1
A
M55
B
M56
C
M57
D
M58
2
A
M59
B
M60
C
M61
D
M62
3
A
M63
B
M64
C
M65
D
M66
4
A
M67
B
M68
C
M69
D
M70
Position of the cable entry
Terminal box position (for mounting position M1)
When viewing DE
G_D087_XX_00133a
2
4
3
1
C
D
B
A
C
C
A
A
C
A
A
C
© Siemens AG 2017