S+S REGELTECHNIK THERMASGARD RTM Bedienungs- Und Montageanleitung Seite 15

G U
Measuring transducers, calibrateable, with active output
Working resistance diagram
Load resistance diagram
800
700
600
500
400
300
250
200
50
10 15 20
Operating voltage (V DC)
TEMPERATURE RANGES:
When selecting measuring transducer ranges,
it is necessary to ensure that the maximum temperatures
permissible for sensor ⁄ housing are not exceeded !
Ambient temperature for measuring transducers:
– 30 ...+ 70 °C / –22...+158 °F
Apparent ohmic resistance = see load resistance diagram
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!
Connecting scheme
Power supply
AC 24V~ 0V
DC 15-36V = GND
TM xx - I
(2-wire-I)
4...20mA
Admissible
range
25 30 35 36 40
Individual operation
Circuitry
V
Dependency of output voltage
on output current
Ia
[ mA ]
20
15
10
5
4
0
0 1 2 3
25
Dependency of output current
on output voltage
Ua
[ V ]
10
8
6
4
2
0
0 1
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!
Connecting scheme
Power supply
AC 24V~ 0V
DC 15-36V = GND
15
4 5 6 7 8 9
450 500
2 3
Parallel operation
Circuitry Circuitry
Rev. Data-V20
TM xx - A
(AOS-I)
4...20mA
Ua
10 [ V ]
Ra
[ ]
TM xx - A
(AOS-U)
0 -10 V
Ia
[ mA ]
4