Siemens SIMOTICS FD 1MQ1, Operating And Installation Instructions

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6.4.3 Connecting the grounding conductor
The grounding conductor cross-section of the motor must be in full conformance with the
installation specifications, e.g. in accordance with IEC 60034-1.
External conductor cross-section S
mm²
Grounding conductor cross-section
mm²
35 25
50 25
70 35
95 50
120 70
150 70
185 95
240 120
300 150
400 185
There is a hexagon bolt with a flat washer and a spring washer on the stator frame at the
designated connection 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
clamping plate at the marked connection point.
Connecting the grounding conductor
● Use the connecting terminals designated for the grounding conductor in the terminal box.
● Ensure that the connecting surface is bare and is protected against corrosion using a
suitable substance, e.g. acid-free Vaseline.
● Arrange the flat washer and spring washer under the screw head.
Electrical connection
6.4 Preparation
SIMOTICS FD 1MQ1
Operating Instructions 01/2019
77