Munters EM52 Manual De Uso Y Mantenimiento página 10

• start/stop selector switch (with characteristics compatible
with the nominal current of the motor), or main panel for
managing the equipment, with control devices which act
on the electrical supply to the fan.
Do not supply power to the fan during
installation stage. Installer must issue a
declaration of correct installation in accordance
with applicable legislation in the country of use.
The rating plate data of the electric motor and
the instructions given in the attached technical
documentation must be used for sizing the
supply cable.
In the event of installations that do not comply
with the directions given in this chapter, the
manufacturer's liability ceases, along with the
validity of the EC declaration of conformity.
The electrical lines must be laid in accordance with
requirements of the laws applying in the place of installation,
and in any event:
• they must be laid with cables of adequate section for the
power of the fan and the length of the line itself;
• they must make an effective earth connection;
• they must have isolating devices and automatic
protection against overload and short circuits.
Before activating the electrical supply to the machine
by turning the isolator switch to position On, a series of
checks must be made:
• check that the voltage and frequency of the power source
correspond to those indicated in the equipment technical
data and electrical diagram;
• check that the connections in the control and power
circuits and the cable glands are tightened correctly, also
in order to preserve the IP protection rating;
• check that the connections in the control and power
circuits are properly tight;
• check that the intensity of the short-circuit expected at the
connection terminals is compatible with the breaking power
of the protection switch upstream of the electrical panel;
• check that the protection devices (fuses, magnetothermic
switches) are correctly sized;
• check that the phases are connected in the correct order:
check that the fan rotates in the direction of the arrow
shown on the driven pulley.
Equipotential protection circuit
To create effective protection against the risk of
electrocution, the outer protection conductor must be
connected to terminal PE inside an electrical panel.
For correct sizing of the protection conductors, see following
requirements as indicated in standard IEC EN 60204-1:
• phase conductor up to 16 mm²: section of the protection
conductor equal to the section of the supply conductor;
• phase conductor between 16 and 35 mm²: section of
protection conductor equal to 16 mm²;
• phase conductor over 35 mm²: section of protection
conductor equal to at least half the section of the supply
conductor.
When connecting all the metal masses to the
earth system, check that there are no insulating
elements between the various conductive
masses (metal parts). The system must not be put into
operation unless the equipotentiality of the masses and the
connection to the earth system have previously been
checked.
Protection against contact voltages
The choice of device to protect the electrical system must
be made in such a way as to ensure the safe intervention of
the main automatic switches and any differential devices
linked to them. For an appropriate choice of the type of
protection for the machine's supply line, especially when
your are installing a motor with the inverter embedded,
taking into account whether the distribution system is TT or
TN, it is advisable to consult an electrical systems designer,
in order to ensure compliance with the requirements of
standard IEC 64-8 or the equivalent provisions in the
country where the machine is being installed.
5.5 Tests and checks before startup
Before startup, it is extremely important to carry out a very
careful check of the fan, in order to prevent malfunctions
and/or accidents.
In particular, perform the following operations.
Equipotential protection circuit:
• check the fan visually, verifying that there are no
particular mechanical irregularities or foreign bodies
inside the structure;
• check that the protective structures (fixed guards made
of metal mesh) are correctly positioned and fixed;
• check that the emergency stop function actuator
operates correctly.
Tension the belt after three days of operation:
improper tension will lead to premature wear on
the transmission devices.
Checking the electrical system:
• check that the supply conductors are properly fixed to the
terminals of the isolating switch;
• check
the
thequipotential circuit;
• check that the guards inside the electrical panel are
correctly positioned and fixed;
• check that the safety devices are receiving power and are
active, and check their effectiveness;
• check that the signal lines have the shielded connected
to gnd signal (0V dc) not to gnd power (earth);
• check that the power lines are placed far from the signal
lines in according with the current regulations;
After this series of checks has been carried out, the fan is
ready for its first startup.
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connections of the conductors in