General Electrical Connection - bürkert 8045 Bedienungsanleitung

3.3 GENERAL ELECTRICAL CONNECTION

Use cables with a temperature limit of 80°C minimum.
For normal operating conditions the measuring signal can be transmitted by a shielded
2
cable of 0.75 mm
The line must not be installed in combination with carrying lines with a higher voltage or
frequency.
If a combined installation cannot be avoided, a minimum space of 30 cm (1 ft) should be
respected.
The cable diameter must be between 6 and 12 mm;
If 2 cables are needed, use the supplied multiway seal and 4-mm diameter cables.
The power supply must be filtered and regulated - section 6.1.
Ensure the equipotentiality of the installation (power supply - transmitter - fluid):
- The various earth spots in the installation have to be connected together to eliminate
the potential differences that may occur between different earthes.
- Observe faultless grounding of the shield at both ends of the cable.
- Earth the negative terminal of the power supply to suppress the common mode cur-
rents. If direct earthing is not possible insert a 100 nF / 50 V-condensator between the
negative terminal and the earth.
Special attention has to be paid if the transmitter is installed on plastic pipesbecause there
is no direct earthing possible.
Proper earthing is performed by earthing together the metallic devices such as pumps or
valves, that are as close as possible to the magmeter. If no such devices are present, insert
metallic piping parts (earthing rings, not supplied) into the plastic pipes before and after the
magmeter and earth them together. The earthin grings shown in the diagram below must be
in contact with the fluid.
Inside of the housing: Connect the shielding of the power
supply cable to pin N° 4 of the electronic board terminal strip.
(*)
(*) or metallic parts, not supplied, inserted inside the pipe.
(**) If direct earthing is impossible, connect a 100 nF / 50 V-condensator between the negative terminal and the
earth.
8045
INSTALLATION
cross section.
Shielding of the power supply cable
(*)
Metallic devices
(valve, pump, etc)
Shielding of the power supply cable
18-36VDC
+
-
Earthing cable originating from
the housing. If the transmitter
(**)
is fitted with a stainless steel
sensor, a second cable origi-
nates from the sensor.
For plastic pipe applications
11
1 2 3 4 5 6