Servicing
9.1 Inspection and maintenance
1FT7 synchronous motors
Operating Instructions, 04/2010, 610.40075.40b
49
9.1.3 Bearing replacement intervals
The bearings are subject to wear and must be replaced after a defined number of operating
hours. At an average load, the bearings should be replaced after around 25,000 hours.
The lifetime can be extended if the motor is operated under favorable conditions (e.g. low or
medium speeds, low radial forces (transverse forces), vibration load).
NOTICE
Harsh operating conditions
If the motor is subject to harsh operating conditions (e.g. continuous operation at n
max
, high
vibration/shock loads, frequent reversing duty etc.), the bearing replacement intervals t
LW
can decrease by up to 50%.
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