7
—30
•
All work at the electric motors must be completed by qualified electricians. Always comply with the safety
instructions of the motor manufacturer.
•
Regularly inspect all screw connections and retighten them if necessary. Those fixings that have locking
devices fitted or are painted over, need not be disturbed if they can be seen to be secure.
•
Only use usual commercial cleaning material paying attention to the prescribed safety measures and do not
use any abrasive tools (surface protection will be destroyed!)
•
When we have design ATEX „D“ – dust, it is necessary to clean dust thru inspection door.
7.2.
Bearings
•
Inspect bearings every month. In order to prevent damage to the components, ensure that no foreign
bodies, dust or moisture can penetrate the bearings. When exchanging or relubricating bearings,
cleanliness is of particular importance. Replace the ball bearings of the motor whenever the grease
utilization period has elapsed in accordance with the maintenance instructions of the manufacturer.
•
For lubrication intervals and quantities as well as exchange intervals, please refer to the lubrication
instructions where you also find detailed specifications of the applied grease. This information is also shown
on the fan type plate (approximately relubricate the ball bearings in intervals of approx. 3
– 6 months.
•
For all other design sizes, the ball bearings feature a lifetime lubrication. Replacement will be required after
the grease utilization period has elapsed. When operating the fan at its limit maintenance work could be
necessary. The ball bearings have been lubricated for life. After the life time lubricant inside the bearings is
used up the bearings must be exchanged.
•
The grease life time of the bearings is: for normal use at 900 min-1 40000 hours, at 14000 min-1 30000
hours, at 2800 min-1 15000 hours, Independent of the working hours bearings should be changed every 5
years.
•
When relubricating the bearing, ensure that there is sufficient room for the grease to expand or escape from
the housing. During lubrication, the temperature in the bearing is increased, due to excess grease caught in
the housing. As soon as the excess grease is removed from the component, the temperature returns to its
steady-state value.
Prior to carrying out any maintenance work at the bearings, drain off the oil. The operator is
responsible for the safe disposal of old oil in compliance with the environmental protection
regulations.
7.3.
Infrequent Use
•
If the fan assembly is to be used less frequently than once a month, or for emergency-use only, additional
maintenance procedures should be carried out and a record kept:
•
The resistance of motor windings to earth should be measured each moth. If the reading is less than 10
M
Ω, the motor should be dried with hot air and re-checked before running the motor.
•
The fan should be run for at least two hours each month to ensure correct lubricant conditions in the
bearings
•
The emergency-use system should be tested each month to ensure that it overrides all other controls and
switches
•
If an anti-condensation heater is fitted, check each month that it automatically switches on
