Siemens SION 3AE5 Operating Instructions Manual page 51

Securing with a spiral
spring pin
Fig. 82 Cleaning and mounting threaded rods (22.1)
for contact arms (22)
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2019-08-05
When tightening the screws, hold the nuts against the tightening torque with a suit-
able screwdriver or socket spanner.
Tightening torque for
- M12: 40 ±4 Nm
- M16: 100 ±10 Nm
Tightening torques apply to greased threads only.
The conductor bars can be secured against twisting with a spiral spring pin accord-
ing to ISO 8748 or a dowel pin according to ISO 8752 — 4 × X*
A drill hole Ø 4H11 must be provided in the conductor bar (see Fig 81, horizontal ar-
row).
See dimension drawings.
)
* X = Length of the spring pin, depending on the cross-section of the busbar in mm
Mounting contact arms and systems
• Grease the screw-in section of the threaded rods with Vaseline.
• Screw in the threaded rod and observe the screw-in depths for safe use (see
Table "Screw-in depths from contact surface in the upper and lower terminals",
page 50).
• Screw the threaded rods to the contact surfaces.
Tightening torque for
- M12: 40 ±4 Nm
- M16: 100 ±10 Nm
Tightening torques apply to greased threads only.
• End faces of the copper contact arms must be
- roughened, cleaned and
- greased with Vaseline.
• End faces with silver-plated contact surfaces must be
- cleaned and
- greased with Vaseline.
Fig. 83 Cleaning and mounting contact arms (22)
Installation
)
mm — N — C.
51