Xylem DIQ/S 281, Operating Manual

Page: 49 / 148

DIQ/S 281 Installation
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03/2023
3.9 Connections to the relay and current outputs
3.9.1 General installation instructions
Materials required  Wire end sleeves, suitable for the connecting wires, with suitable crimping
tool
 4 x cable gland with sealing ring (scope of delivery of the DIQ/S 281)
Tools  Cable stripping knife
 Wire stripper
 Phillips screwdriver
 Small screwdriver
WARNING
If external electrical circuits that are subject to the danger
of physical contact are incorrectly connected to the relay
contacts, there may be a danger of life threatening electric
shock. Electrical circuits are regarded to be subject to the
danger of physical contact when there are voltages higher
than the Safety Extra Low Voltage (SELV).
Pay attention to the following points during installation:
 Electrical circuits subject to the danger of physical
contact may only be connected by a qualified electri-
cian.
 Electrical circuits subject to the danger of physical
contact may only be connected when they are voltage-
free.
 If electrical circuits subject to the danger of physical
contact are switched with a relay, no circuit that is not
subject to this danger (e. g. the DIQ/CHV module) may
be operated on the further relays.
 Switching voltages and switching currents on the relay
contacts must not exceed the values specified in
chapter 9 T
ECHNICAL DATA
. Protect electrical circuits
against currents that are too high with an electrical
fuse.
 Only single-phase consumers can be switched with the
relays. Under no circumstances may multiphase con-
sumers be switched with the aid of several relays (ex-
ample: three-phase current driven pumps). Always
switch multiphase consumers via a protective relay.
 After the Universal Transmitter DIQ/S 281 has been in-
stalled, it may only be opened if all external voltages
have been switched off beforehand.