Level Pro ITC 450, User Manual

Page: 10 / 59

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4.3. CONNECTION METHOD
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.
The unit is not equipped with an internal fuse or power supply circuit breaker. Because of this
an external time-delay cut-out fuse with a small nominal current value must be used
(recommended bipolar, max. 2A) and a power supply circuitbreaker located near the unit. In
the case of using a monopolar fuse it must be mounted on the phase cable (L).
The power supply network cable diameter must be selected in such a way that in the case of a
short circuit of the cable from the side of the unit the cable shall be protected against
destruction with an electrical installation fuse.
Wiring must meet appropriate standards and local regulations and laws.
In order to secure against accidental short circuit the connection cables must be terminated
with appropriate insulated cable tips.
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 the case of the unit being fitted with separable clamps they should be inserted into
appropriate connectors in the unit, even if they are not used for any connections.
Unused terminals (marked as n.c.) must not be used for connecting any connecting cables
(e.g. as bridges), because this can cause damage to the equipment or electric shock.
If the unit is equipped with housing, covers and sealing to, protecting against water intrusion,
pay special attention to their correct tightening or clamping. In the case of any doubt consider
using additional preventive measures (covers, roofing, seals, etc.). Carelessly executed
assembly can increase the risk of electric shock.
After the installation is completed do not touch the unit’s connections when it is switched on,
because it carries the risk of electrical 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.
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ITC 450/470
User manual