JUMO 406060, Operating Manual

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5 Installation
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5.5.2 Installing the connecting cables
Compliance with the following items is required when routing
signal cables:
• A magnetic coil cable (red and brown) is run parallel to the
signal lines (violet and blue). As a result, only one cable is
required between the sensor and the transmitter. Do not
use junction boxes or terminal strips for routing cables.
• The signal cable carries a voltage signal of only a few
millivolts and must, therefore, be routed over the shortest
possible distance. The maximum permissible signal cable
length is 50 m (164 ft).
• Avoid routing the cable in the vicinity of electrical
equipment or switching elements that can create stray
fields, switching pulses and induction. If this is not
possible, run the signal / magnetic coil cable through a
metal pipe and connect this to the station ground
potential.
• All leads must be shielded and connected to the station
ground potential.
• The cable contains outer shielding to shield against
magnetic interspersion. Connect this at the SE terminal.
• Also connect the supplied stranded steel wire to the SE
terminal.
• Do not damage the sheathing of the cable during
installation.
• Make provisions for a drip loop (water trap) when
installing the connecting cables for the sensor.
1
Drip loop
Figure 32: Installing the connection cables
5.5.3 Connection via cable conduit
Figure 33: Installation set for cable conduit
NOTE
Condensate formation in terminal box.
If the sensor is permanently connected to cable conduits, there
is a possibility that moisture may get into the terminal box as a
result of condensate formation in the cable conduit.
Ensure that the cable entry points on the terminal box are
sealed.
An installation set for sealing the cable conduit (Conduit) is
available via part no. 00645908.