Siemens SIMOTICS HT Series, Инструкция по эксплуатации и установке

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6.3.4 Connecting the grounding conductor
The grounding conductor cross-section of the machine must be in full conformance with the
installation specifications and to IEC / EN 60204-1.
Table 6-2 Determining the cross-section of the grounding conductor
External cable cross-section S Cross-section of the grounding conductor [mm²]
S ≤ 16 mm² S
16 mm² < S ≤ 35 mm² 16 mm²
S > 35 mm² S/2
There is a hexagon bolt with a flat washer and a spring washer on the stator frame at the
designated connecting point for the grounding conductor. This can be used for connecting
stranded conductors with cable lugs or ribbon cables with an appropriately shaped conductor
end.
When making connections, ensure the following:
● The connecting surface is bare and protected against corrosion using a suitable substance,
e.g. acid-free Vaseline.
● The flat and spring washers are located under the bolt head.
● The maximum permissible clamping thickness of 10 mm for the cable lug or strap is not
exceeded.
● The minimum required screw-in depth and the tightening torque for the clamping bolt as
given in the table below are observed. Screw-in depth and tightening torque are different
depending on whether cable lugs or ground terminals are used.
Table 6-3 Tightening torques of bolts (cable lug)
Bolt Screw-in depth Tightening torque
M12 x 25 > 16 mm 38 Nm
M16 x 35 > 20 mm 92 Nm
Table 6-4 Bolt tightening torques (ground terminals)
Bolt Screw-in depth Tightening torque
M6 > 9 mm 8 Nm
M8 > 12 mm 20 Nm
M10 > 15 mm 40 Nm
M12 > 18 mm 70 Nm
M16 > 20 mm 170 Nm
Connecting the grounding conductor in the terminal box
In the terminal box, use the connection terminals designated for the ground conductor.
Electrical connection
6.3 Preparation
SIMOTICS HT Series HT-direct 1FW4...1......A
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Operating Instructions 11/2018