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8. MAINTENANCE, REPAIR, CLEANING
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During all work on fan in the hazardous area:
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Maintenance work to be only performed by trained service personnel.
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Observe the safety and labour regulations (DIN EN 50 110, IEC 364).
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The rotor must be stand still!
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Open the electrical circuit and secure against being switched back on.
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Verify the absence of voltage.
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No maintenance work on running fan.
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Wear safety shoes and gloves for handling.
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Keep the airways of the fan free – danger because of objects dropping out!
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Wet cleaning under voltage may lead to an electrical shock – danger to life!
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Regular inspection, if necessary, with cleaning, is required to prevent imbalance due to ingress of dirt.
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Do not use any aggressive, paint solvent cleaning agents when cleaning.
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Never use a high-pressure cleaner or spray jet to clean.
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Avoid letting water permeate into the motor and the electrical installation.
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After cleaning the motor must be operated for 30 mins at 80-100% of the max. speed to let it dry out.
This will allow any inside water to dry out.
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Ball bearing service life
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According to standard calculation methods, bearing service life expectation of the motor integrated ball
bearings is mainly determined by the grease service life F10 and amounts for standard application to
approx. 30,000 to 40,000 operating hours. The fan or motor is maintenance-free due to the use of ball
bearings lifetime lubrication. Once the grease operating life F10h has been reached, it may be necessary
to replace the bearing. The bearing service life expectation may change compared to the specified value,
if operating conditions such as increased vibration or shocks, increased or too low temperatures, humidity,
dirt in the ball bearing or unfavourable control modes are present. A service life calculation for special
applications can be provided on request.
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The service life of EC fans with power electronics is decisively dependent on the ambient temperatures.
The longer electronic components are exposed to high ambient temperatures, the faster the deterioration
and the more probable the failures. The power electronics protects itself against excessive temperatures by
active temperature management (power reduction).
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Take note of abnormal operating noise.
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Watch-out for vibration free motion.
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Please consult our service department with regards to changing the bearing as for all other damage
(e.g. to the coil).
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On 1 phase motors, condenser rating can decrease with time, life expectancy approx. 30,000 hours, as per
DIN EN 60252.
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Outdoor fans – if a fan is stationary for long periods in a moist atmosphere, it should be switched ON for
minimum of 2 hours every month to remove any moisture that may have condensed within the motor.
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Fan with IP55 degree of protection or higher: open the existing sealed condensation bores at-least every
6 months.
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