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Connecting The Grounding Conductor - Siemens 1LA8 Operating Instructions Manual

Simotics tn series n-compact induction motor.
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Electrical connection
6.3 Preparation

Connecting the grounding conductor

The grounding conductor cross-section of the machine must be in full conformance with the
installation specifications, e.g. according 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. The grounding conductor can be
connected as follows:
● With stranded cables with cable lugs
● With flat cables with cable end designed accordingly
As an alternative, you can connect the grounding conductor without cable lugs using a terminal
plate at the marked connection point.
Connecting the grounding conductor
● Ensure that the connecting surface is bare and is protected against corrosion using a
● Arrange the flat washer and spring washer under the bolt head.
● Check that the maximum permissible clamping thickness of 10 mm for the cable lug or strap
● Fasten the clamping screw according to the following table. Screw-in depth and tightening
● Use the connecting terminals designated for the grounding conductor in the terminal box.
See also
Converter operation (Page 79)
Determining the cross-section of the grounding conductor
Phase conductor cross-section S
S > 35
suitable substance, e.g. acid-free vaseline.
is not exceeded.
torque are different depending on whether cable lugs or ground terminals are used.
When using cable lugs
When using grounding
Cross-section of grounding conductor
Screw-in depth
M12 x 25
M16 x 35
Tightening torque
> 16 mm
> 20 mm
> 9 mm
> 12 mm
> 15 mm
> 18 mm
> 20 mm
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
38 Nm
92 Nm
8 Nm
20 Nm
40 Nm
70 Nm
170 Nm


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