Fan Section; Fan; Motor; Drive - TCF ZAE Series Installation, Operation And Maintenance Manual

6.5.

FAN SECTION

6.5.1.

Fan

In order to keep the fan in perfect working order WE
RECOMMEND YOU CHECK THE FOLLOWING AT LEAST
ONCE A MONTH:
- The cleanliness of the screw and wheel; remove any
deposits
- Damage and corrosion to the fan components; remedy
with zinc-powder paint
- The tightness of the parts comprising the fan section
- Seal of the vibration-damping joint fitted to the fan
delivery inlet
- Cleaning and lubrication of any DAPO' control air locks.
Lubrication of this part must be performed every six
months.
- Absence of abnormal noise due to deterioration of the
bearings. if necessary, replace them. The fans mounted on
the TCF Units are fitted either with oilless bearings
(design life 2000 hours) or pedestal bearings. depending
on the operating conditions. The pedestal bearings
require periodic lubrication.
INTERVALS shown in Table 1 0 are subject to the
environmental conditions and the maximum temperature
range during operation.
TABLE 9
LUBRICATION OF FAN PEDESTAL BEARINGS
6.5.2.

Motor

In order to maintain the motor in perfect working order,
TCF recommends the FOLLOWING MONTHLY CHECKS:
- Cleanliness; remove any deposits
- Absence of abnormal noise due to deterioration of the
bearings.
Powerful motors fitted with grease nipples require
periodic lubrication. The greasing intervals, under normal
operating conditions, are shown in Table 11.
24
THE LUBFIICATION
TABLE 10
Greasing of motor bearing
NOTE: The bearings must be greased more frequently in
harsh operating conditions.
6.5.3.

Drive

In order to ensure optimum drive efficiency and to avoid
damaging the fan motor unit, the drive must be kept in
perfect working order.
The following must be CHECKED EVERY MONTH:
- The operating condition and dirtiness of the drive;
remove any deposits
- Damage to the drive (cracks on belts and pulleys, frayed
belt edges, worn belts and pulleys). lf necessary replace
the damaged part(s)
- Perfect alignment of the drive
- Belt tension (see section 6.5.4.).

6.5.3.1. Determining belt tension

To alter the tension of the driving belts you must move
the motor. To facilitate this operation the motors are
positioned on;
- guides
- belt-tensioning slides.
In both cases it is easy to tighten or slacken the driving
belt by means of the lock nuts and adjusting screws.
In order to determine DRIVING BELT TENSION, you must:
- establish a centre distance (I) and block the drive
- using a spring-operated torque wrench, apply a force (P)
on the midway point of the belt (perpendicular to it) to
obtain a deflection equal to 1/64 of the centre distance
(approximately 16 mm/m)
- check that the force applied is within the values
indicated in table 12. Otherwise, set a new centre distance
and repeat the test.
TABLE 11