Potential Concept; Cable Cross-Sections; Table 6-1 Cable Cross-Sections; Figure 6-3 Potential Concept - Siemens SINAMICS SM120 Operating Instructions Manual

Electrical connection

6.4 Cable cross-sections

I/O interfacing
● Create a low-impedance ground connection for additional cabinets, system components,
● Ground unused lines at one end in the cabinet.
● Choose the greatest possible clearance between the power and signal cables (at least 20
● Avoid unnecessarily long cable loops.
● The operating coils for contactors and relays in the drive must be connected to overvoltage
● In order to reduce noise/interference entering or exiting via the cable, filter auxiliary voltages
6.3

Potential concept

A noise-free connection between the internal and external supply voltage can be achieved by
connecting the 0 V potentials to each other and grounding them. This also eliminates the need
for the control circuit insulation monitor required by DIN EN 60204-1.
Figure 6-3
6.4 Cable cross-sections
Table 6-1
Object
Power cable
Cabinet protective conductor
See also
Torques (Page 94)
70
and distributed devices with the largest possible cross-section (at least 16 mm²).
cm). The greater the distance over which the cables are routed in parallel, the greater the
clearance must be. You must install additional shields if sufficient clearance cannot be
maintained.
limiters (e.g. RC elements or varistors).
in the control cabinet.
Potential concept
Cable cross-sections
Cross-section
Max. 240 mm
2
Max. 120 mm²
Remark
max. 4 per terminal
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SINAMICS SM120 6SL38715
Operating Instructions 07/2015