Siemens SIMOTICS M-1PH1, Equipment Manual, Page: 77 / 134

Electrical connection
6.4 System integration
1PH1 main motors
Equipment Manual, 09/2021, A5E51077676A-AA
75
Selecting and connecting the cables
Observe the following when connecting cables:
•
Twisted or three-core cables with an additional ground conductor should be used as
power cables. The insulation should be removed from the ends of the conductors so that
the remaining insulation extends up to the cable lug or terminal.
• The cables should be freely arranged in the motor terminal box so that the protective
conductor has an enough length and the cable conductor insulation cannot be damaged.
The cables should be appropriately strain relieved.
• Take special care that a required air clearance of ≥ 4.5 mm is actually maintained.
Checking/testing after connecting up
• The inside of the terminal box must be clean and free of any cable pieces.
• All of the terminal screws must be tight.
• The minimum air distances must be maintained.
• The cable glands must be reliably sealed.
• Unused cable glands must be closed and the plugs must be tightly screwed in place.
• All of the sealing surfaces must be in a perfect condition.
6.4.3 Routing cables
Rules for routing cables
In order to achieve the greatest possible EMC compatibility for the complete system, the
following EMC measures must be carefully observed:
•
Signal cables and power cables must be routed at the greatest possible distance from one
another.
• If necessary, signal and power cables may cross one another (if possible at an angle of 90
°C), but must never be laid close or parallel to one another.
• Signal cables may not be routed close to strong external magnetic fields (e.g. motors and
transformers).
• Pulse-loaded HC/HV lines must always be laid completely separately from all other lines.
• If signal lines cannot be routed a sufficient distance away from other cables, they must be
installed in grounded cable ducts (metal).
• The clearance (interference injection area) between the following lines must be kept to a
minimum:
– Signal line and electrical circuit signal line (twisted)
– Signal line and associated equipotential bonding conductor
– Equipotential bonding conductor and protective conductor (routed together)