Required Cable Cross-Sections For Line And Motor Connections - Siemens SINAMICS G130 Engineering Manual

Parallel-connected converters
Out- Converter Weight
put SINAMICS
G150
(stan-
Version A
dard
model)
Type
[kW]
6SL3710-... [kg]
380 V – 480 V 3AC
630 2GE41-1AA3 1700
710 2GE41-4AA3 1710
900 2GE41-6AA3 2130
500 V – 600 V 3AC
630 2GF38-6AA3 1700
710 2GF41-1AA3 1700
1000 2GF41-4AA3 2620
660 V – 690 V 3AC
1000 2GH41-1AA3 1700
1350 2GH41-4AA3 2620
1500 2GH41-5AA3 2700
1750 2GH41-8EA3 3010
1950 2GH42-0EA3 3010
2150 2GH42-2EA3 3070
2400 2GH42-4EA3 3860
2700 2GH42-7EA3 4580
1) The recommendations for the North American market in AWG or MCM must be taken from the appropriate NEC (National
Electrical Code)/CEC (Canadian Electrical Code) standards.
Note:
The recommended and maximum connection cross-sections for the SINAMICS G150 parallel converters refer in
each case to one of the two rectifier sections or to one of the two inverter sections.
Exception: The recommended and maximum connection cross-sections for the parallel converter with output power
rating 2700 kW refer in each case to one of the two rectifier sections and to one of the three inverter sections.
5.4.2

Required cable cross-sections for line and motor connections

Generally speaking, unshielded cables can generally be used to make the line connection. 3-wire or 4-wire three-
phase cables should be used wherever possible. By contrast, it is always advisable to use shielded cables between
the converter and motor and, in the case of drives in the higher output power range, symmetrical 3-wire, three-phase
cables, and to connect several cables of this type in parallel where necessary. There are basically two reasons for
this recommendation:
This is the only way in which the high IP55 degree of protection can be achieved for the motor terminal box without
problems because the cables enter the terminal box via glands and the number of possible glands is limited by the
geometry of the terminal box. Therefore single cables are less suitable.
With symmetrical, 3-wire, three-phase cables, the summed ampere-turns over the cable outer diameter are equal to
zero and they can be routed in conductive, metal cable ducts or racks without any significant currents (ground current
or leakage current) being induced in these conductive, metal connections. The danger of induced leakage currents
and thus of increased cable-shield losses increases with single-wire cables.
The required cable cross-section depends on the amperage which flows through the cable. The permissible current
loading of cables is defined, for example, in IEC 60364-5-52. It depends on ambient conditions such as the
temperature, but also on the routing method. An important factor to consider is whether cables are routed singly and
are therefore relatively well ventilated, or whether groups of cables are routed together. In the latter instance, the
cables are much less well ventilated and might therefore heat one another to a greater degree. For the relevant
correction factors applicable to these boundary conditions, please refer to IEC 60364-5-52. The table below provides
a guide to the recommended cross-sections (based on IEC 60364-5-52) for PVC-insulated, 3-wire copper and
aluminum cables, a permissible conductor temperature of 70°C (e.g. Protodur NYY or NYCWY) and an ambient
temperature of 40°C.
Line supply connection
Recommended Maximum cable
1)
cross-section cross-section
IEC IEC
2
2
[mm ] [mm ]
2x240 4x240
3x185 4x240
4x150 8x240
2x185 4x240
2x240 4x240
3x185 8x240
2x240 4x240
3x185 8x240
4x150 8x240
4x150 8x240
4x185 8x240
4x185 8x240
4x240 8x240
4x240 8x240
Motor connection
M12 Recommended Maximum cable
1)
fixing cross-section cross-section
screw
IEC IEC
(no. of
2
[mm ]
holes)
(2) 2x185
(2) 2x240
(4) 2x240
(2) 2x150
(2) 2x185
(4) 2x240
(2) 2x185
(4) 3x150
(4) 3x185
(4) 3x185
(4) 3x240
(4) 3x240
(4) 4x185
(4) 3x185
SINAMICS Engineering Manual – November 2015
SINAMICS G150
Engineering Information
Cabinet
grounding
M12 fixing M12 fixing
screw screw
(no. of (no. of
2
[mm ]
holes) holes)
4x240 (2) (2)
4x240 (2) (10)
4x240 (2) (16)
4x240 (2) (2)
4x240 (2) (2)
6x240 (3) (18)
4x240 (2) (2)
6x240 (3) (18)
6x240 (3) (18)
6x240 (3) (18)
6x240 (3) (18)
6x240 (3) (18)
6x240 (3) (18)
6x240 (3) (18)
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