Connections And Earthing - Siemens Reyrolle 7SR5 Operating Manual

Installing the Devices

2.3 Connections and Earthing

2.3 Connections and Earthing
Earthing the Devices
The 7SR5 devices are protection class I equipment and must be connected to the system earth before commis-
sioning.
!
DANGER
Danger due to device being improperly earthed
Incomplete and careless earthing 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.
The case earth stud should be solidly earthed to the panel earth. Terminal B28 (power supply unit) should be
connected to the case earth stud. A minimum wire size of 2.5 mm
Connecting Devices
•
Connect all cables and leads. Use the connection diagrams in the Hardware and Device manuals.
Earthing the Device
•
Join several on‑site operation panels to one another with firm contact.
The case earth stud should be solidly earthed to the panel earth. Terminal B28 (power supply unit) should
be connected to the case earth stud. A minimum wire size of 2.5 mm
[sc_7SR5_size6_Earthing, 1, en_US]
Figure 2-3
22
Earthing Points
is recommended.
2
is recommended.
2
Reyrolle 7SR5, Operating, Manual
C53000-B7040-C013-1, Edition 05.2021