Observe the documentation for tightening torques of the cable entries and sealing plugs for
direct mounting at the machine as well as additional glands (e.g. adapters).
6.4 Connecting the grounding conductor
The machine's grounding conductor cross-section must comply with EN/IEC60034-1.
Please also observe installation regulations suchas those specied in EN/IEC60204-1.
Basically, there are two ways of connecting a grounding conductor to the machine.
• Internal grounding with a connection in terminal box at the location intended for this
purpose and marked accordingly.
• External grounding with connection at the stator housing at the locations intended for this
purpose and marked accordingly.
6.4.1 Minimum surface area of grounding conductor
Table 6-3 Minimum cross-sectional area of grounding conductor
Minimum cross-section of the phase conductor
for installation
S
[mm²]
Minimum cross-section of the associated
grounding connection
[mm²]
S ≤ 25 S
25 < S ≤ 50 25
S>50 0.5 S
6.4.2 Grounding connection type
Enclosure grounding method Cable cross-section
[mm²]
Connection of an individual conductor under
the external grounding bracket.
M8 120
M12 150
Connection is made using a DIN cable lug un‐
der the external grounding bracket. DIN 46
234
M8 120
M12 150
Electrical connection
6.4Connecting the grounding conductor
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A 71
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