S+S Regeltechnik PREMASGARD 722 Series Operating Instructions, Mounting & Installation page 15

G
®
PREMASGARD
SUPPLY VOLTAGE :
For operating voltage reverse polarity protection, a one-way rectifier or
reverse polarity protection diode is integrated in this device variant.
This internal one-way rectifier also allows operating 0 - 10 V devices on AC
supply voltage.
The output signal is to be tapped by a measuring instrument. Output
voltage is measured her against zero potential (O V) of the input voltage!
When this device is operated on DC supply voltage , the operating voltage
input UB+ is to be used for 15...36 V DC supply and UB – or GND for
ground wire!
When several devices are supplied by one 24 V AC voltage supply, it is to be
ensured that all "positive" operating voltage input terminals (+) of the field
devices are connected with each other and all "negative" operating voltage
input terminals (–) (= reference potential) are connected together (in-phase
connection of field devices). All outputs of field devices must be referenced
to the same potential!
In case of reversed polarity at one field device, a supply voltage short-
circuit would be caused by that device. The consequential short-circuit
current flowing through this field device may cause damage to it.
Therefore, pay attention to correct wiring!
Working resistance diagram
(4...20 mA)
Load resistance diagram
500
450
400
300
200
100
25
10 15 20
Operating voltage (V DC)
Conversion table for pressure values:
Unit =
1 Pa
1 kPa
1 bar
1 mbar
1 mH O
0.0980665 bar
2
722x
PREMASGARD ® 722x
Admissible
range
25 30 35 36 40
bar
0.00001 bar 0.01 mbar
0.01 bar
1 bar 1000 mbar
0.001 bar
98.0665 mbar
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
4-terminal
connection
230V AC
mbar
1 Pa
10 mbar 1000 Pa
100000 Pa
1 mbar 100 Pa
9806.65 Pa
15
Circuitry
0V
Circuitry
0V
24V AC/DC
1 2 3 4
Pa kPa
0.001 kPa
1 kPa
100 kPa
0.1 kPa
9.80665 kPa
Individual operation
V
Parallel operation
Circuitry
PREMASGARD ® 722x
PLC
PC
mH O
2
0.000101971 mH O
2
0.101971 mH O
2
10.1971 mH O
2
0.0101971 mH O
2
1 mH O
2