Munters EM52 Manual De Uso Y Mantenimiento página 8

• start/stop
selector
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 supply cables and the conductor
providing external protection are correctly connected;
• 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
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;
switch (with characteristics
protection devices
• 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, 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.
(fuses,
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.
After this series of checks has been carried out, the fan is
ready for its first startup.
technicians when the fan reaches a complete standstill.
8 | © Munters AB, 2017
Tension the belt after three days of operation:
improper tension will lead to premature wear
on the transmission devices.
connections of
Do not operate the fan with the safety
protections removed: safety meshes can be
removed only with specific tools by qualified
the conductors in