Siemens SIMOTICS 1PQ8 - Measuring the Insulation Resistance before Commissioning; Greasing the Roller Bearings Prior to Commissioning

7.3 Measuring the insulation resistance before commissioning
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 51)
7.4 Greasing the roller bearings prior to commissioning
The following information assumes that the specified storage conditions have been complied
with.
General specifications
● Pay attention to the instructions on the lubricant plate.
● Regrease in portions. The shaft must rotate so that the new grease can be distributed in
the bearings.
Regreasing the roller bearings prior to commissioning
● If the period between delivery and commissioning is more than a year and less than four
years:
– Re-grease the roller bearings with twice the amount of grease specified on the lubricant
plate.
– Check the bearing temperature, as far as possible.
Regreasing roller bearings before commissioning
You must regrease the roller bearings under the following conditions:
● If the machine has been in storage for more than four years.
● If the machine has not been stored in accordance with the specifications in the "Storage"
section.
Start-up
7.3 Measuring the insulation resistance before commissioning
SIMOTICS TN Series N-compact 1PQ8
92 Operating Instructions 11/2018