S+S Regeltechnik AERASGARD ACO2-W Manuel D'utilisation page 15

G
Installation and Commissioning
Putting in operation
After switching on the device, a self-test and tempering period follows.
This procedure takes 30 - 50 minutes,depending on the ambient conditions.
During this time the output analogue voltage differs from the actual measured value.
Manual calibration can then be performed as an option. Make sure that no harmful
substances influence the calibration process and that the sensor is operated in fresh air.
The ABC logic can then be optionally activated.
Switching point setting
A potential-free changeover contact is available as a switch output.
A switching point between 10 % and 95 % of the measuring range can be selected using
the SET potentiometer. The 10 % value is added to the fresh air limit of 400 ppm for CO
(600...1900 ppm with MR = 0...2000 ppm or 900...4700 ppm with MR = 0...5000 ppm).
With other measurands, the corresponding lower limit is used directly as a basis.
(VOC: 10...95 %, Temperature: –23...+74 °C, Humidity: 10...95% r.H. )
The assignment of the switch output to measurand is done via DIP switch (DIP 7 and DIP 8).
Offset
Each measuring channel
of the measurement. The adjusting range is ± 10 % of the measuring range.
Display
In the first and second lines, the measurements with the corresponding units
( CO in ppm, VOC in %, temperature in °C, relative humidity in % r.H.)
2
are displayed in a cyclical series.
In the third line, the switching status of the relay is shown on the left as a circuit
●
(full = relay energised; empty
followed by the corresponding indicator
(C for CO ; V for VOC; T for temperature; H for relative humidity in % r.H.)
2
and the switchpoint value is shown on the right.
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 on AC supply voltage.
The output signal is to be tapped by a measuring instrument. The output
signal 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!
has a separate offset
○
= relay de-energised)
.
2
potentiometer for subsequent
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
Connecting scheme
Power supply
AC 24V~
DC 15-36V = GND
15
adjustment
Circuitry
0V
V
Circuitry
0V
Individual operation
Parallel operation
Circuitry