Supply Voltage - S+S Regeltechnik HYGRASGARD VFF-I Operating Instructions, Mounting & Installation

G
®
HYGRASGARD

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 volt-
age is measured 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!
NOTE
At transmitters with current output the humidity output (Pin 2)
must categorically be connected !
Connecting diagram
Output:
0 -10 V
230V AC
24V AC/DC
1 2 3 4
VFF ⁄ VFTF
VFTF - xx - U
Connecting diagram
with ⁄ without Output:
display 4...20 mA
230V AC
PLC
PC
24V DC
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
VFTF - xx - I
with ⁄ without
display
PLC
Working
resistance
1 2 3 4
Circuitry
0V
V
Circuitry
0V
NOTE
Load resistance diagram
For 4...20 mA devices, DC voltage must be used
(without residual ripple, see permissible range of load
resistance diagram). Do not use pulsating DC voltage.
800
Load resistance diagram
4...20 mA
Load resistance diagram
700
600
800
500
700
400
600
300
500
250
200
400
50
10
300
250
Operating voltage (V DC)
200
50
10 15 20 25
Operating voltage (V DC)
Rev. 2018 - V20 GB
Individual operation
Parallel operation
Circuitry
VFF
VFTF
Admissible
range
Admissible
range
15 20 25 30 35 36 4
30 35 36 40