FW_F113A_v1901_02_EN.docx
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4.4.2.
PROTECTIVE EARTH (PE) CONNECTIONS
Inside the unit, different types of bonding and earthing are used. The common ground is mostly used
for termination of the wire shields; the Protective Earth (PE) is used for electrical safety.
For externally powered installations, route the Protective Earth (PE) grounding conductor into the
enclosure together with the incoming power conductors.
Risk of damage to equipment!
Be very careful when connecting terminal 00 / GND to Protective Earth (PE).
This terminal is internally connected to the common ground of the system and (especially
when multiple power supplies are connected) the PE connection can cause ground loop
currents that could damage the equipment.
Metal enclosure
When the F113-A is supplied with a metal enclosure (aluminum or stainless steel), the enclosure
must be grounded in accordance with national and local electrical codes.
To ground the field mounted unit, the PE conductor must be connected to the PE stud which is
located in the metal back cover, as indicated in the image below. To connect the conductor, a screw
(M4 x 6mm) with a serrated washer, a terminal and a washer is used (torque: 2 Nm). The metal front
cover is connected to the Protective Earth by the mounting screws with serrated washers.
To ground the panel mounted unit, the PE conductor must be connected to the metal front cover
through one of the four mounting screws. For this purpose, an additional nut, terminal and washer is
supplied.
Field mounted
Panel mounted
Front cover
Fig. 7: Protective Earth (PE) connections on metal enclosure
Plastic enclosure
When the F113-A is supplied with a non-metal enclosure (e.g. plastic), the field mount enclosure
meets the requirements of class 2 (double insulated). Therefore any incoming PE conductor can be
terminated with an insulating end cap.
When the F113-A is panel mounted, the installation class and protective earth requirements depend
on the panel or type of cabinet.
4.4.3.
ALUMINUM ENCLOSURE - FIELD MOUNTED
Risk of damage to equipment!
Do not use the terminal 00 to connect the protective earth wire, the 00 and the common
ground terminals are internally connected. Be careful, to prevent damage to equipment when
you connect different power supplies (sensor, PLC, etc.). Inside the Fluidwell display, the
common grounds are internally connected to each other.
The PE connection
The PE connection is made with the PE stud
inside the back panel and the 4 mounting
screws that attach the cover to the back panel.
