14
5 Connecting to power supply
SU 600 Ex • 4 … 20 mA signal conditioning instrument
30653-EN-150129
5.3 Wiring plan
+ -
1 2
+ -
3 4
18 17 16 15 14 13 12 11 10 9 8 7 6 5
N- L1+
on
1
2
1
2
%
1
2
3
4
5
6
7
Fig. 6: Terminal assignment SU 600 Ex
1 Measurement data input, optionally available with sensor power supply
2 Current output
3 Fail safe relay
4 Relay 2
5 Relay 1
6 Voltage supply
Information:
Via the slide switch on the rear of the instrument you can switch over
between active and passive operation of the measuring data input:
•
In active mode, SU 600 Ex provides the power for the connected
sensors. Power supply and measurement data are transmitted
over the same two-wire cable. This mode is provided for connec-
tion of measuring transducers without separate voltage supply
(sensors in two-wire version).
•
In passive mode the sensors are not powered, only the measured
value is transmitted. This input is for connection of transmitters
with their own separate voltage supply (sensors in four-wire ver-
sion). The SU 600 Ex can be also looped into the existing circuit
like a normal ammeter.
The position of the slide switch also influences the preconditions for
Ex implementation. Take note of the type approval certificate or the
conformity certificate ofSU 600 Ex.
Overview