Maintenance
9.2 Inspection and maintenance
1FK7 G2 synchronous motors
Operating Instructions, 05/2021, A5E50907562B AA
115
9.2.2 Cleaning
Electric shock when cleaning due to failing to observe the protection class
When cleaning, especially with high-pressure cleaning equipment, water can enter
energized parts and cause an electric shock.
• Clean the motor in a manner appropriate for its protection class.
Avoid pressurized water on connectors, terminal boxes, and other live parts.
Clean the motor of dust and dirt as required. In this way, you ensure adequate heat
dissipation.
9.2.3 Bearing replacement interval
The bearings are subject to wear and must be replaced after a defined number of operating
hours.
For average load levels, the bearings must be replaced after approx. 25,000 hours.
Note
When replacing the motor bearings, always replace the encoder as well. For more
information on encoder replacement, see Service manual replacing an encoder
(
https://support.industry.siemens.com/cs/document/99457853/encoder-replacement-in-1fk7-
g2-and-1ft7?dti=0&dl=en&pnid=13308&lc=de-WW).
Bearing replacement intervals can be extended if the motor is operated under favorable
conditions, e.g. low average speeds, low radial forces (cantilever forces), vibration load.
Note
Harsh operating conditions
If the motor is subject to harsh operating
conditions (e.g. continuous operation at nmax, high
vibration/shock loads, frequent reversing duty etc.), the bearing replacement intervals t
LW
can
decrease by up to 50%.
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