Grounding And Connecting Devices; Tightening Torques Of Fastening Screws - Siemens SIPROTEC 5 Manual

Fitting the Devices
3.1 Flush-Mounting Devices

Grounding and Connecting Devices

3.1.3
Grounding the Devices
The SIPROTEC 5 devices are protection class I equipment must be connected with the system ground before
commissioning.
!
DANGER
Danger due to device being improperly grounded
Incomplete and careless grounding leads to death, severe injury, and considerable material damage!
The device must be situated in the operating area for at least 2 hours before you connect it to the
²
power supply for the first time. This method prevents condensation of water in the device.
If the device has been in storage for more than 2 years, connect it to an auxiliary voltage for 1 to 2
²
days. This will cause the electrolytic capacitors to form on the printed circuit board assemblies again.
² Ground each module with solid low-impedance system grounding (cross-section ≥ 4.0 mm
grounding area ≥ M4).
Connecting Devices
Connect all cables and leads. Use the connection diagrams in the Hardware and Device manuals.
²
Tighten the terminal screws to the prescribed torques.
²
Grounding an On-Site Operation Panel
Join several on-site operation panels to one another with firm contact.
²
Siemens recommends the use of contact washers on painted metal assembly walls. If the assembly wall is
not metallic, place a metal layer, for example a metal sheet, between the assembly wall and the on-site
operation panels. Then connect this sheet to the system ground.

Tightening Torques of Fastening Screws

3.1.4
Tightening Torques for Terminal Screws
Type of Line
Litz wire with ring-type lug
Stranded wires with bootlace ferrules
or pin-type lugs
Solid conductor, bare (2 mm
NOTE
i
i
Make sure that the cables and lines of extra-low voltage circuits are laid sufficiently far away from power
network circuits.
Torques for Other Screw Types
Screw Type
M4 x 20
M4 x 8
M2.5 x 6
48
Current Voltage Terminal with
Terminal Spring-Loaded Terminals
2.7 Nm No ring-type lug
2.7 Nm 1.0 Nm
2.0 Nm 1.0 Nm
2 )
Torque
1.2 Nm
1.2 Nm
0.39 Nm
2 (0.16 in
Voltage Terminal with
Screw Connection
No ring-type lug
0.6 Nm
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SIPROTEC 5, Operation, Manual
C53000-G5040-C003-C, Edition 08.2020
2 ),