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Electrical connection
6.3 Preparation
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
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,
● 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
● The minimum required screw-in depth and the tightening torque for the clamping bolt as
Table 6-3
Table 6-4
Connecting the grounding conductor in the terminal box
In the terminal box, use the connection terminals designated for the ground conductor.
66
Determining the cross-section of the grounding conductor
External cable cross-section S
S ≤ 16 mm²
16 mm² < S ≤ 35 mm²
S > 35 mm²
e.g. acid-free Vaseline.
exceeded.
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.
Tightening torques of bolts (cable lug)
Bolt
M12 x 25
M16 x 35
Bolt tightening torques (ground terminals)
Bolt
M6
M8
M10
M12
M16
Cross-section of the grounding conductor [mm²]
Screw-in depth
> 16 mm
> 20 mm
Screw-in depth
> 9 mm
> 12 mm
> 15 mm
> 18 mm
> 20 mm
SIMOTICS HT Series HT-direct 1FW4...1......A
S
16 mm²
S/2
Tightening torque
38 Nm
92 Nm
Tightening torque
8 Nm
20 Nm
40 Nm
70 Nm
170 Nm
Operating Instructions 11/2018
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