Operating manual
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5.2
Electrical installation
The terminals configuration are shown in Figure 01.
Figure 01
: Input connections and power supply
Figure 02
:
Thermocouple, Pt100 and 50 mV signal connection
Figure 03
: Current (mA) and Voltage (V) signal connection
This indicator offers an auxiliary 24 VDC +/-15% at 50 mA power supply which is typically applied to
power up two wire 4 to 20 mA field transmitters. The
Figure 04
presents the wiring for this
application.
Figure 04:
Auxiliary 24 VDC usage example
5.3
Recommendations for the installation
To minimize the pick-up of electrical noise, the low voltage DC connections and the sensor
input wiring should be routed away from high-current power conductors. If this is impractical,
use shielded cables. In general, keep cable lengths to a minimum.
The input signal conductors shall be positioned throughout the factory separate from the output
and the power supply conductors, in grounded conduits if possible.
The power supply of the electronic instruments shall come from a proper source for the
instrumentation network.
It is recommended to use RC FILTERS (0,1uF in series with 100 ohms) to suppress the noise
generated by contactors coils, solenoids, etc.
