Mounting the Line Sensor
²
Fasten both busbar-coupler pieces in both the holes in the control-cabinet wall.
The busbar-coupler pieces (incl. nut and lock washer) are included in the scope of delivery for the sensor.
²
Connect one end of the line sensor to a busbar-coupler piece and route the sensor fiber along the section
to be protected, for example, the busbar.
²
Make sure that the piece of fiber exposed to the arc has a minimum size of 0.5 m and that the distance
from the potential arc source is a maximum of 0.25 m.
If these boundary conditions cannot be satisfied, please contact our Customer Support for further ques-
tions.
²
Fasten the sensor fiber, or example, with cable fasteners.
Ensure that the fiber is not damaged or broken when fastening.
²
The sensor fiber is non-conductive. However, ensure that the sensor fiber is laid in such way as to avoid
contact with hot or energized parts.
²
During installation, make sure that the sensor and the line are not damaged by sharp edges.
²
Sensor areas that should not react to light can be covered up.
²
Pass the sensor fiber back again and fasten it with the 2nd busbar-coupler piece.
²
The line must not be bent or stressed in any other way.
R = 50 mm (minimum bending radius)
Maximum continuous tensile force = 1 N
²
Fasten the supply line with the busbar-coupler piece to the side of the protection device.
²
Remove the dust caps from the plug and connect the supply line to the plug-in module.
NOTE
Order the line sensor and the supply line with a suitable line length. If the line is too long, it must not be
shortened! It must be rolled up with a minimum diameter of 0.3 m because of the optical loss.
Obey the general recommendations of the manufacturers of optical lines.
NOTE
The contact surfaces of the plug must be clean.
Completing Installation
²
Resume operation of the device.
NOTE
In order to warrant safe functioning, the affected sensor must be substituted after detection of an arc.
NOTE
Hereby, Siemens declares that until now, UL has neither investigated whether the device can detect an arc-
protection fault, neither if in case of an arc-protection fault, the safety of personnel and system is guaran-
teed.
Working on the Device
5.4 Arc Sensors for Module: ARC-CD-3FO
SIPROTEC 5, Hardware Description, Manual 207
C53000-G5040-C002-M, Edition 12.2021
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