21
KS-KR-KCs-KC56_U211600
EN
7.1 MAINTENANCE REQUIREMENTS
The fans are designed and manufactured for long life even under
the most heavy service conditions.
Please remember however that this equipment HAS moving
parts, and as such they need to be checked regularly.
It is therefore recommended to implement a preventive
maintenance program, which will be entrusted to skilled and
competent personnel.
The daily inspection must be performed to prevent any failure
due to adverse effects of the working environment such as
temperature, humidity, dust, dirt and vibration, and other factors.
WARNING
The fan must be fixed so that the side casings are easily
removable to allow maintenance and cleaning operations.
Check that the water drain holes on the bottom panel are not
obstructed so as to ensure proper drainage.
WARNING
In the machine maintenance and inspection phases there is a
risk of entanglement and cutting of clothes, limbs, hair or other
parts of the body by the fan.
During these phases acquire the PPE, in particular safety
clothing and gloves, tie long hair back and do not wear rings,
bracelets or necklaces.
CAUTION
To ensure a high level of safety, use only original spare parts
available from your supplier. In case of using non-original parts, full
functionality and compliance with EC directives regarding electrical
safety and electromagnetic compatibility are not ensured.
WARNING
When working on the machine, it is necessary to make all
personnel are aware of this.
In the event of maintenance work, affix a warning sign onto
the power supply switch to inhibit accidental operation by a
second operator.
Regularly carry out the following operations:
•
Ensure that the inlet and outlet openings are clean and free
of objects.
•
Ensure the fan is always dry. If the fan appears wet, dry
it immediately; identify the cause and remedy to prevent
corrosion.
•
Check the cable connections and connectors. In the event of
loose connections, damaged cables, or other abnormalities,
stop the fan immediately and seek specialised assistance or
technicians.
•
Check for bolts or nuts that are loose or rusted because of
environmental conditions. In this case, tighten or replace.
•
Check for any deposits inside the equipment. In the case,
remove the deposits by compressed air jets.
The following table specifies the periodic routine checks that the
user must perform to maintain the machine in good condition.
INTERVENTION
FREQUENCY
LUBRICATION OF THE MACHINE
never
CLEANING OF THE MACHINE
weekly
ADJUSTMENT OF THE DRIVE BELT
TENSION
quarterly
SCREW TIGHTNESS CHECK
quarterly
REPLACEMENT OF THE DRIVE BELT
when necessary
6.5 SPEED ADJUSTMENT
(Only for 3-phase type motors)
The fan motor speed can be controlled by means of suitable
frequency converters.
If frequency converters are used, in order to ensure that the
machinery complies with Electromagnetic compatibility (EMC)
requirements replace the cable and the cable gland supplied with
shielded symmetrical cables and EMC cable glands (i.e. cable
glands providing 360 ° bonding between the cable shield and the
motor housing).
You also need:
•
to use shielded symmetrical cables and EMC glands along the
entire line between the frequency converter and the machine,
for example on the converter, possible junction boxes, safety
switches, motor etc...;
•
do not exceed the motor/propeller rotation speed indicated in
the technical data table;
•
set the converter so that the speed can be regulated within the
two limits:
- maximum speed - indicated in the technical data table;
- minimum speed - greater than or equal to 50% of the rated speed
•
the design and sizing of the electrical system are delegated to
the installer or to a deputy; all work must comply with the rules
in force in the destination country.
•
Comply with the provisions laid down in the frequency converter
manufacturer’s installation manual.
6.6 INITIAL START-UP
Before starting the fan:
•
make sure you have not left any object or tool inside the machine;
•
ensure that cement or lime residues have not been deposited
on the blades during installation work; the resulting fan
imbalance would cause to harmful vibrations causing rapid
wear of the propeller bearing;
• ensure that the wire mesh safety guards are securely fitted to
the machine;
• ensure that staff keep a safe distance (at least 30 metres) from
the machine.
•
check that the electrical protection and safety devices are
operating correctly.
Once the fan has been started:
•
verify that it has been correctly installed checking to see that there is
no unusual vibration and/or noises. if there any of these are present
then switch off the machine, identify the problem and rectify it;
•
check that the fan rotation direction is anticlockwise when
viewed from the fan air inlet side; if the rotation direction is
clockwise and hence erroneous then invert the two wires in the
power line (three-phase motors).
