Siemens SINAMICS G130 Engineering Manual page 91
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- List manual (1976 pages) ,
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- Engineering manual (530 pages)
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A method of calculating the permissible cable lengths for multi-motor drives l
motor drives is described below.
The diagram explains the quantities and terms used for both single-motor and multi-motor drives.
Block diagram of single-motor drive and multi-motor drive with relevant quantities and terms
The permissible motor cable length per motor on a multi-motor drive is calculated with the fomula:
Definition and meaning of applied quantities:
•
l
Permissible cable length between the subdistributor and each motor in a multi-motor drive.
M
•
n
Maximum number of motor cables which can be connected in parallel in a single-motor drive. This
S max
value can be found in the chapters on specific units or in the relevant catalogs.
•
C
(A
) Capacitance per unit length of a shielded motor cable with the maximum permissible cross-section
S max
max
A
for a single-motor drive. This value can be found in the table on the next page and is
max
depending on the maximum permissible cross-section A
units or the relevant catalogs.
•
l
Permissible motor cable length for single-motor drive as specified in the tables on the previous
S max
page (depending on the number of motor reactors (1 or 2) and whether the cable is shielded or
unshielded).
•
n
Number of parallel cables between the converter and subdistributor on a multi-motor drive.
D
•
C
(A)
Capacitance per unit length of the cable between the converter and subdistributor on a multi-motor
D
drive.
•
l
Length of the cable between the converter and subdistributor on a multi-motor drive.
D
•
n
Number of parallel cables on motor side of subdistributor = number of motors.
M
•
C
(A)
Capacitance per unit length of cables on motor side of subdistributor.
M
Fundamental Principles and System Description
⋅
n
C
A
(
=
S
max
S
max
max
l
M
n
M
M
⋅
−
⋅
⋅
l
n
C
A
l
)
(
)
S
max
D
D
⋅
C
(
A
)
M
max
SINAMICS Engineering Manual - May 2008
Engineering Information
based on the catalog data for single-
D
specified in the chapters on specific
© Siemens AG
91/396
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