Siemens 1PH728, Operating Instructions Manual

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Transport, assembly, and connection
3.3 Electrical connection
A5E00177602A AD
30
Siemens AG Operating Instructions 2.02 1PH728
Select the connecting cables taking into account the rated current and the system specific
conditions (e.g. ambient temperature, routing type etc. in accordance with IEC EN 60204-1).
Direction of rotation
Connection of the power cables in the phase sequence L1, L2, L3 to U, V, W results in
clockwise rotation. If two of the connections are swapped then the resulting direction of
rotation is counter-clockwise (e.g. L1, L2, L3 to V, U, W).
Note
These restrictions in terms of the direction of rotation relate to the particular type of motor
design and result, for example, from the use of unidirectional fans. Any restrictions in terms
of the direction of rotation resulting from the installation itself are not shown in the
information on the rating plate and need to be considered separately when making the
connections.
Terminal designations
The following definitions apply in principle to the terminal designations of three-phase motors
in accordance with DIN VDE 0530 Part 8 or IEC 60034-8:
Table 3-3 Terminal designations (with the 1U1-1 as an example)
1 U 1 - 1 Designation
x
Index showing the pole assignment for pole-changing motors (where applicable,
a lower number indicates a lower speed) or, in special cases, for a subdivided
winding
x Phase designation (U, V, W)
x Index showing the start (1) / end (2) or tapping point of the winding (if there is
more than one connection per winding)
x Additional index for cases in which it is obligatory to connect parallel power feed
cables to several terminals with otherwise identical designations
Connecting using cable lugs
To connect the cables to the main terminals, select cable lugs that match the necessary
cable cross-section and bolt size M16.
Table 3-4 Terminal box assignments
Size Motor type Terminal
box type
Cable
entry Max. poss.
outer
diameter of
cable [mm]
No. of main
terminals
Max.
connectable
cross-section
per terminal
[mm
2
]
Max. poss.
current per
terminal 1)
[A]
1PH7 motors, size 280
1PH728.-..B
1PH7284-..C 280
1PH7284-..D
1XB7712 3 x M63 x 1.5 53 (3+1)
2)
x 3 x M16 3 x 95 450