Motors – Operating and Assembly Instructions
20 B 1091 en-3118
Motors must be properly inspected at regular intervals; current national standards and regulations must
be complied with. In particular, special attention must be paid to any mechanical damage, free path of
the cooling air, abnormal noises and correct electrical connection.
Only original parts may be used as spare parts with the exception of standardised, commercially
available and equivalent parts.
Swapping parts between motors of the same type is not permissible.
Information
Condensation outlets
If the motors are designed with closed condensation outlets, these must be opened occasionally in order to allow
any accumulated condensation to drain off. Condensation outlets must always be located at the lowest point of
the motor. During installation of the motor care must be taken that the condensation outlets point downwards
and are closed. Open condensation outlets cause a reduction of the protection class.
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2.2 Bearing replacement intervals
Under normal operating conditions, with horizontal installation of the motor, depending on the coolant
temperature and the motor speed, the bearing replacement interval [h] for IEC motors is:
25°C 40°C 60°C
up to 1,800 rpm approx. 40,000 h approx. 20,000 h approx. 8,000 h
up to 3,600 rpm approx. 20,000 h approx. 10,000 h approx. 4,000 h
Under special operating conditions, e.g. vertical motor installation, large stresses due to vibration and
shock, or operation with frequent reversing, the operating hours stated above are significantly reduced.
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