COLASIT AG
Plastics Construction
CH-3700 Spiez
Phone +41 (0)33 655 61 61 Fax +41 (0)33 654 81 61
Page 11
TD-000 803-E
Edition 05/2021, Object of alteration
Copyright by COLASIT AG Spiez
6.2
Performance
The fan must be maintained in accordance with the Maintenance Plan below. The maintenance work carried
out must be noted down in the logbook (see the section on Logbook).
every week
every month
every year
•
Make a visual inspection of fan
for damage, leaks, corrosion
and attachment.
•
Check the smooth running of
the fan and electric motor.
•
Check state and tension of the
V-belt and replace if
necessary.
•
Check the impeller and casing
for deposits and clean if
necessary.
•
Check the shaft bearing for
smooth running and vibrations.
Bearing maintenance -> see
chart below for regreasing
intervals.
•
Remove any dust deposits on
the fan and motor.
•
Check the flexible transitions
from fan to duct system for
leaks and state.
•
Check the function of the
condensate nozzle.
•
Check the state of the vibration
dampers.
•
Check the state of the hub
gasket (if fitted).
•
Carry out a thorough cleaning
of the entire fan (including
impeller).
•
Check the parts in contact with
the conveyed medium for
corrosion.
•
Check the minimum clearance
between the impeller and
casing (minimum 1% of intake
diameter, maximum 20mm).
•
Measure the vibrations at
bearings (KA) or motor (DA).
Alarm according to ISO 14694:
≤ 3.7 kW, categorie BV-2: 14.0
mm/s (r.m.s.) or
≤ 300 kW, categorie BV-3: 11.8
mm/s (r.m.s.).
•
Check the safety devices (e.g.
splinter protection or intake
grating) for condition and
function.
•
Check the stands for damage
and stability.
•
Check all screw unions for firm
seating.
Normally the bearings are designed for a service life of 40,000 hrs. After this period the
bearings must be replaced. The service life of the bearings is reduced when subjected to
increased requirements (e.g. high temperature, aggressive ambient air or operation with
frequency converter).
On drives with V-belts, check the tension regularly and monitor the belts closely particularly during the first
weeks of operation. This also applies after long periods of downtime. Excessive tension leads to bearing
damage, insufficient tension leads to slip, wear and frictional heat.
After replacing a V-belt, check the tension after 1 to 4 hours of operation and retension as necessary.
The fan bearings are maintenance-free and the grease filling is designed for about 20,000 hours of
operation. The bearing temperature of 70ºC may not be exceeded. In cases of high stress (environment) the
grease quantity loses its lubricity over time due to mechanical stresses, ageing and increasing
contamination.
The bearings must then be greased according to the following table:
