Munters EM52 Manual De Uso Y Mantenimiento página 9

The fixing sytems of the safety protections are not
interchangeable with other devices. Therefore, if for
maintenance reasons the user damages or loses any
component, this must be definetely ordered from the
manufacturer as spare parts and it cannot just be replaced
with other components, even similar, not supplied by the
constructor itself. In this particular event the manufacturer
refuses all responsibility on consequent damages caused
to things and people and considers any kind of warranty
lost.
Operating conditions of motors with inverter.
Some models of our fans allow to adjust the
number of revolutions through inverter (also
called VFD). In case of adjustment made by
VFD the installer has to pay particular attention to the
following aspects:
• it is necessary that the resistance of the ground line to
which the equipment are connected has a very low
values (about 15-20 ohm) in order to avoid high
currents that can flow through the motor bearings and
damage them;
• It is necessary to install the proper line filters, to avoid
interference and allow
equipment;
• the minimum frequency of operation of the engines in
the case of absence of a forced external ventilation is
30 Hz. In the case of an operating frequency below 30
Hz is necessary to provide an external forced ventilation
to the engine.
Keep motor body clean. Dust deposit on motor
body will lead to overheating and failure of
bearings and motor itself. Do not use water for
motor cleaning. Use compressed air only. Water spraying
will cause rust inside the bearings and lead to their failure.
6. COMMISSIONING
The fan must not be used without first reading
and understanding the user manual and
becoming completely familiar with the controls.
Storage. All the components and spare parts
MUST be stored in dry and clean environment.
Cleaning the fan. We recommend to avoid to
use water for washing fans since the electric
motors and the bearings of the central hub and
centrifugal system support might get damaged by water
infiltration. In case there is an unbreakable need to use
water for cleaning the fans, the electric motor, the central
hub and the centrifugal weight mechanism have to be
adequately protected by water sprays.
proper operation of
9 | © Munters AB, 2017
6.1 Control devices
This chapter gives instructions on the control devices with
which the electrical control panel must be fitted, which
shall be done at the installation stage.
At the fitting stage, the installer must set up a control panel
complying with the requirements of standard IEC EN
60439-1 and arrange the wiring of the fan in accordance
with the instructions in standards IEC EN 60204-1 and IEC
60364.
The electrical circuit of the fan must generally be fitted with
the devices indicated in section 'Connection to the
electrical system'.
6.2 Instructions for machine use
Switching on and starting up
Before starting the machine:
• check that all the guards for the hazardous areas are in
their correct positions;
• check that all the electrical safety components are in
place and check their effectiveness by activating them;
• check the presence of the electricity supply.
To start the fan, go through the following procedure:
the
• turn the isolator switch to position On;
• press the fan starter button.
Normal stopping
In the event of necessity the fan can be stopped by
operating the relative control device (stop), which shall be
installed on the electrical panel.
Activating this control must cause the fan blade to stop
rotating, but does not cause isolation of the power supply:
the fan can be started again by pressing the start button.
In the event that the fan does not need to be used for an
extended period of time, the following stop procedure must
be used:
• operate the stop button;
• operate the emergency stop button;
• open the main isolator switch (position "0") on the
electrical panel and attach a padlock to the actuator.
Interrupting the electricity supply, equivalent to
isolating by the operator with the main switch,
causes complete fan shutdown: restoring the
electricity supply will not cause any movement in the
machine.
Emergency stop
Operating the main emergency stop button causes the fan
to stop moving.
The function is controlled by a red mushroom type button
on a yellow background, provided with mechanical locking
and release by
instantaneous interruption of the power supply to the
electric motor which makes the rotor turn (uncontrolled
shutdown category 0 according to IEC EN 60204-1).
turning. Operating it causes the