Measuring The Insulation Resistance During The Course Of Maintenance Work; Maintenance Intervals; Rolling-Contact Bearings - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

Maintenance
9.3 Inspection and maintenance
9.3.6.1

Measuring the insulation resistance during the course of maintenance work

Measuring the insulation resistance and polarization index (PI) provides information on the
condition of the machine. It is therefore important to check the insulation resistance and the
polarization index at the following times:
● Before starting up a machine for the first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
The following information is provided regarding the state of the winding insulation:
● Is the winding head insulation conductively contaminated?
● Has the winding insulation absorbed moisture?
As such, you can determine whether the machine needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
● Can the machine be put into operation?
● Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
"Testing the insulation resistance and polarization index" (Page 46)
9.3.6.2

Maintenance intervals

Perform the following maintenance measures after the operating time or the intervals specified
in the following table elapse.
Table 9-2
Maintenance measures
Initial inspection
Regreasing
Permanent lubrication (with coupling
output)
Cleaning
Main inspection
9.3.6.3

Rolling-contact bearings

The motors have rolling-contact bearing bushes for grease lubrication. Depending on the
version, the motors are permanently lubricated or are equipped with a regreasing device.
Depending on the type of load, a deep-groove ball bearing or a cylindrical-roller bearing is
fitted as a floating bearing on the drive end.
The DE bearing contains built-in compression springs that help to rebalance the axial play of
the external bearing rings.
92
Maintenance measures
Maintenance intervals
After 500 operating hours, at the latest after six months
See the lubricant plate
Replace bearings after approximately 20,000 operating hours,
at the latest after three years
Depending on the degree of pollution
After approximately 16,000 operating hours, at the latest after
two years
Operating Instructions 05/2012 A5E03986435A AA
SIMOTICS M-1PH8