Level limit switch
Series VN 4000
Technical Information / Instruction manual
page G
Electrical installation
Handling
In the case of inexpert handling or handling malpractice the electric safety of the device cannot
be guaranteed.
Protective earthing
Before any electrical installation, the device must be connected to the protective earthing
terminal inside the housing.
Installation regulations
The local regulations or VDE 0100 (Regulations of German Electro technical Engineers) must be
observed.
For installation of electronics "3-wire PNP" (Protection Class III), an approved power supply with
reinforced insulation to mains is required
Fuse
Use a fuse as stated in the connection diagrams (page G13).
RCCB protection
In the case of a defect, the distribution voltage must automatically be cut off by a RCCB
protection switch so as to protect the user of the device from indirect contact with dangerous
electric tensions.
Power supply switch
A Power-supply-disconnecting switch must be provided and marked near the device.
Wiring diagram
The electrical connections have to be made according to the wiring diagram.
Supply voltage
Compare the supply voltage applied with the specifications given on the electronic and name
plate before switching the device on.
Cable gland / closing
element
The screwed cable gland and closing element must have following specifications:
Ingress protection IP67, temperature range from -40°C to +70°C, UL or VDE certified (depending
on the country where the unit is installed), pull relief.
Make sure that the screwed cable gland safely seals the cable and that it is tight (danger of water
intrusion). Cable glands that are not used have to be locked with a closing element.
Conduit system
In case of using a conduit system (with NPT thread) instead of a cable gland the regulations of
the country where the unit is installed must be observed. The conduit must have a tapered thread
either NPT 1/2“ or NPT 3/4” in accordance with the unit and ANSI B 1.20.1. Not used inlets must
be closed tight with a metal closing element.
Field wiring cables
The diameter of the field wiring cable has to match to the clamping range of the used cable gland.
All field wirings must have insulation suitable for at least 250V AC. The temperature rating must
be at least 90°C (194°F).
Connecting the terminals
Make sure that max. 8mm (0.31“) of the pigtails are bared (danger of contact with live parts).
Relay and transistor
protection
Provide protection for relay contacts and output transistors to protect the device against spikes
with inductive loads.
Protection against static
charging
The housing of the unit must be grounded in any case to avoid static charging of the unit on
applications with pneumatic conveying and non-metallic containers .
General Safety Instructions
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VN 4000 a
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