Siemens 1FW4, Руководство по эксплуатации

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Transport, installation and assembly
3.9 Connecting the ground conductor
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
49
There is a hexagon bolt with a flat and spring washer on the stator frame at the designated
connecting point for the ground conductor. This can be used for connecting stranded
conductors with cable lugs or ribbon cables with an appropriately shaped conductor end.
When making the connection, ensure that:
●
the connecting surface is bare and is 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 for the cable lug or strap of 10 mm is not
undershot.
● the minimum required screw-in depth and the tightening torque for the clamping bolts as
given in the following table are observed.
These differ depending on whether cable lugs or ground terminals are used:
Table 3-2 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 3-3 Tightening torques of bolts (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
Connection in the terminal box
In the terminal box, use the connection terminals designated for the ground conductor.
Connecting the radio-frequency ground for forced-ventilated motors
Note
For water-cooled motors, a radio-frequency ground is required between the terminal box and
the housing due to the steel housing.