Electrical Connections; Routing The Signal And Magnet Coil Cable - ABB ProcessMaster Commissioning Instruction

Electrical connections

5 Electrical connections
5.1

Routing the signal and magnet coil cable

Observe the following points when routing cables:
• A magnet 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 flowmeter sensor and the transmitter. Do not
run the cable over junction boxes or terminal strips.
• The signal cable carries a voltage signal of only a few millivolts and must, therefore, be
routed over the shortest possible distance. The max. allowable signal cable length is 50 m
(164 ft) without pre-amplifier and 200 m (656 ft) with pre-amplifier.
• 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 /
magnet coil cable through a metal pipe and connect this to the station ground.
• All leads must be shielded and connected to the station ground potential.
• To shield against magnetic interspersion, the cable contains outer shielding. This is attached
to the SE clamp.
• The supplied stranded steel wire is also connected to the SE clamp
• Do not damage the sheathing of the cable during installation.
• Make sure during installation that the cable
is provided with a water trap (1). For vertical
installation, align the cable glands pointing
downward.
28 - EN
Fig. 25
FEX300, FEX500 CI/FEX300/FEX500-EN