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FW-F018-P-M_v0404_01_EN.docx
4.5
ELECTRICAL INSTALLATION
•
Electro static discharge does inflict irreparable damage to electronics! Before installing or
opening the F018-P, the installer has to discharge himself by touching a well-grounded
object.
•
For reasons of ESD and safety, always ground the metal enclosure properly as indicated,
especially if the unit has been supplied with the 115-230V AC power-supply type PM or
relays type OR. It is the responsibility of the installer to install, connect and test the
Protective Earth connections in accordance with the (inter)national Rules and
Regulations.
•
This chapter shows general information regarding the electrical installation of the F018-P .
Chapter 5 gives additional specific information regarding Intrinsically safe installation and
overrules the information given in this chapter.
•
Do not combine metal front covers with non-metallic rear covers, vice versa and / or
cable glands. A metal cover on a non-metallic rear cover could lead to ESD. A metal
cable gland in a non-metallic enclosure could invalidate isolation.
•
The installation must comply with (inter)national requirements and local ordinances.
o
Within the European Union and the UK, all installations must comply with national
regulations.
o
Within Canada all field wiring must conform to Section 18-156 of the Canadian
Electrical Code for installations within Canada.
o
Within the United States all field wiring must conform to the National Electric Code,
NFPA 70, Article 501-4(b).
4.5.1
ELECTRICAL SAFETY
Please consult the table with environmental conditions and safety parameters shown at the
beginning of this chapter.
General directions:
•
The metal front panel is connected to the Protective Earth by the mounting screws and serrated
washers.
•
The wire screens (shield) are meant to prevent electromagnetic interference and shall be
connected to the common ground terminals that belong to the specific sensor connection.
The wire screens shall be terminated at one side to prevent wire loops. Inside of the Fluidwell
unit, the different common ground terminals are connected to each other. It is advised, as
illustrated, to terminate the wire screens in the vicinity of the sensor and to insulated the wire
screen with a shrink tube at the Fluidwell unit side.
•
Separate cable glands with effective IP67 / TYPE 4(X) seals for all wires.
•
Unused cable entries: ensure that you fit IP67 / TYPE 4(X) plugs to maintain rating.
•
A reliable ground connection for both the sensor, and if applicable, for the metal enclosure.
•
An effective screened cable for the input signal, and grounding of its scree
n to the “┴ “ terminal or
at the sensor itself, whichever is appropriate to the application.
4.5.2
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 the common ground of the system to Protective Earth (PE).
Connecting the common ground to Protective Earth (PE) (especially when multiple power
supplies are connected) can cause ground loop currents that could damage the equipment.
Metal enclosure
When the F018-P 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.
