Usage Of The Auxiliary Voltage - Xylem WTW DIQ/S 281 Operating Manual

DIQ/S 281
Connection
scheme for one
sensor with
compressed air
cleaning
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WARNING
No free wires are allowed to project into the housing. Oth-
erwise, there is a danger that areas safe to contact could
come into contact with dangerous voltages. This could re-
sult in life threatening electric shock when working with
the universal transmitter DIQ/S 28X. Always cut off any
wires that are not in use as closely as possible to the cable
gland.
7 Close the enclosure of the DIQ/S 28X.

3.9.2 Usage of the auxiliary voltage

The universal transmitter DIQ/S 28X has a 24 V output (designation
HILFSSPANNUNG or AUXILIARY VOLTAGE on the terminal strip). You can
use this auxiliary voltage for the relay-controlled opening of the valve in a DIQ/
CHV valve module for the compressed air-driven sensor cleaning function. To
do so, you have to connect the auxiliary voltage output, a free relay contact and
the valve connection in the DIQ/CHV in series. Bridge a terminal of the auxiliary
voltage output with a terminal of a relay output and run a control line from the
remaining terminals to the valve module.
The auxiliary voltage must not be used for other purposes.
Terminal strip
DIQ/S 28X
X17
Terminal strip
DIQ/CHV
X6
Run the bridge below the divider so the bridge does not bump against the circuit
board in the lid when the enclosure is closed.
08/2020
R3 R2 R1
X16 X15 X14 X13 X12
X5 X4 X3
VERTEILER
DISTRUBUTION
HILFS-
SPANNUNG
AUXILIARY
VOLTAGE
X11 X10
Valve
control line
X2 X1
VENTIL
VALVE
Installation
37