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9.1.2
Maintenance intervals
General
Careful and regular maintenance, inspections, and overhauls are essential for detecting and
eliminating faults in good time before they can cause any damage.
NOTICE
Inspection if there are faults or unusual conditions
Unusual conditions or faults that place undue electrical or mechanical stress on the three-
phase motor (e.g. overload, short-circuit) can cause consequential damage to the machine.
If faults or any unusual conditions occur (e.g overload or short-circuit), the machine must be
inspected immediately.
Measures, inspection/maintenance intervals
Operating conditions and characteristics can vary widely. For this reason, only general
maintenance intervals can be specified here.
● Maintenance intervals should, therefore, be scheduled to suit the local conditions (fouling,
● Perform the following measures after the operation time or the interval specified in the
Table 9- 1
Measures after operating times or intervals
Measures
Initial inspection
General inspection
Without radial shaft sealing rings
With radial shaft sealing rings
Replace the bearings
Replace the radial shaft sealing rings
Clean the fan (forced ventilation)
Cooling water system (water cooling)
9.1.3
General inspection guidelines
When inspecting a motor, you do not generally need to dismantle it. The motor only be
dismantled if the bearings need to be replaced.
Synchronous/induction motors 1PH813
Operating Instructions, 04/2009, 610.48000.22
switching frequency, load, etc.).
following table elapses.
Operating tines and intervals
After 500 operating hours, after 6 months at the latest
Approx. every 8000 operating hours, after 2 years at the latest
Approx. every 5000 operating hours, after 2 years at the latest
Note the recommended bearing replacement intervals (see "Bearing
replacement intervals")
Approximately every 5000 operating hours
Depending on local degree of pollution
Maintenance free (provided that the required cooling water quality is ensured)
Maintenance
9.1 Inspection and maintenance
65
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