User manual - LIQUID SENSOR DRS-30x
4.3.
CONNECTION METHOD
Caution
- Installation should be conducted by qualified personnel . During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- This device is not fully isolated. Pay special attention to installation
method, while the device is installed outside. User should use proper
measures, guarantee safety while storm lighting e.g. safety equipment like:
separators, isolators etc. Due to the risk of electric shock, additional PE
connection should be made between the device and the rest of
construction details.
- Wiring must meet appropriate standards and local regulations and laws.
- Tighten the clamping screws. The recommended tightening torque is 0.5 Nm.
Loose screws can cause fire or defective operation. Over tightening can lead to
damaging the connections inside the units and breaking the thread.
- In some cases use additional preventive measures (covers, roofing, etc.) to avoid
the unit against mechanical damages. Carelessly executed assembly can increase
the risk of electric shock.
Due to possible significant interference in industrial installations appropriate measures
assuring correct operation of the unit must be applied. To avoid the unit of improper
indications keep recommendations listed below.
–
Avoid common (parallel) leading of signal cables and transmission cables together with
power supply cables and cables controlling induction loads (e.g. contactors). Such cables
should cross at a right angle.
–
Contactor coils and induction loads should be equipped with anti-interference protection
systems, e.g. RC-type.
–
In the case of magnetically induced interference the use of twisted couples of signal
cables (so-called “spirals”) is recommended. The spiral (best if shielded) must be used
with RS-485 serial transmission connections.
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