Permissible Motor Cable Lengths With Motor Reactor(S) For Single-Motor And Multi-Motor Drives - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information

Permissible motor cable lengths with motor reactor(s) for single-motor and multi-motor drives

Permissible motor cable lengths for drives with one motor (single-motor drives)
The tables below specify the permissible motor cable lengths in systems with one motor reactor or two series-
connected motor reactors for SINAMICS G130, G150 and S150, S120 Motor Modules (Chassis and Cabinet
Modules).
Line supply voltage
380 V – 480 V 3AC
500 V – 600 V 3AC
660 V – 690 V 3AC
Maximum permissible motor cable lengths with 1 or 2 motor reactors for
SINAMICS G130 Chassis and SINAMICS G150 cabinets
Line supply voltage
380 V – 480 V 3AC
500 V – 600 V 3AC
660 V – 690 V 3AC
Maximum permissible motor cable lengths with 1 or 2 motor reactors for SINAMICS S150 cabinets
and SINAMICS S120 Motor Modules in the format Chassis and Cabinet Modules
Note:
The specified motor cable lengths always refer to the distance between inverter output and motor along the cable
route and already allow for the fact that several cables must be routed in parallel for drives in the higher power range.
The recommended and the maximum connectable cross-sections plus the permissible number of parallel motor
cables are unit-specific values. These values can be found in the unit-specific chapters of this engineering manual or
in the relevant catalogs.
Permissible motor cable lengths for drives with several motors at the converter output (multi-motor drives)
Normally a single motor is connected to the converter output. There are however applications such as roller drives or
gantry drives on container cranes which require a large number of identical, low-power-output motors to be supplied
by a single converter of sufficiently high output rating. This type of configuration is referred to as a "multi-motor drive".
Within the narrower context of the calculation procedure described below, the term "multi-motor drive" always applies
if the number of motors connected to the converter output is higher than the maximum permissible number of parallel
motor cables specified in the catalog.
Motor reactors (or motor filters) must always be installed for multi-motor drives. The individual motors are connected
by cables of very small cross-section due to their low power rating. The capacitance per unit length of these cables is
significantly lower than that of the large cross-section cables used for single-motor drives. As a result of this reduced
capacitance per unit length, the total permissible cable lengths per converter output for multi-motor drives can exceed
the values specified in the above tables by a significant amount without violating the maximum permissible
capacitance values stipulated for the converter and motor reactor.
SINAMICS Engineering Manual – May 2008
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© Siemens AG
Maximum permissible motor cable length
with 1 reactor
Shielded cable Unshielded cable
e.g. Protodur e.g. Protodur
NYCWY
300 m 450 m
300 m 450 m
300 m 450 m
Maximum permissible motor cable length
with 1 reactor
Shielded cable Unshielded cable
e.g. Protodur e.g. Protodur
NYCWY
300 m 450 m
300 m 450 m
300 m 450 m
with 2 series-connected reactors
Shielded cable
e.g. Protodur
NYY NYCWY
On request
On request
On request
with 2 series-connected reactors
Shielded cable
e.g. Protodur
NYY NYCWY
525 m
525 m
525 m
Unshielded cable
e.g. Protodur
NYY
On request
On request
On request
Unshielded cable
e.g. Protodur
NYY
787 m
787 m
787 m