Commissioning After Storage; Insulation Resistance And Polarization Index; Lubricating The Rolling Bearings; Regreasing Rolling Bearings After Storage Periods Of Up To Two Years - Siemens SIMOTICS 1LE8 Operating Instructions Manual

4.5.5

Commissioning after storage

4.5.5.1

Insulation resistance and polarization index

Measuring the insulation resistance and polarization index (PI) provides information on the
condition of the motor. It is therefore important to check the insulation resistance and the
polarization index at the following times:
• Before starting up a motor 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 motor needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
• Can the motor be put into operation?
• Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
Checking the insulation resistance and polarization index of the winding (Page 173)
4.5.5.2

Lubricating the rolling bearings

If you correctly store the machine for a longer period of time, it can be assumed that within a
period of two years, the grease in the bearings will not deteriorate.
• For motors with thermal class 155, for normal ambient temperatures, use a lithium-soap
• For machines with thermal class 180, and for certain special machines, use the grease
4.5.5.3

Regreasing rolling bearings after storage periods of up to two years

• For motors with regreasing systems, lubricate both bearings before commissioning with
• Grease type, grease quantity and relubrication intervals for the regreasing system are
4.5.5.4

Releasing the rotor shipping brace before commissioning

If one is being used, release the rotor shipping brace before commissioning.
1LE8 轴高 80 ... 355
操作说明, 11/2022, A5E52373573A
rolling bearing grease with a melting point of at least 180 °C.
specified on the machine lubricant plate.
the motor running as a precautionary measure.
stamped on the rating plate attached to the motor.
Preparing for use
4.5 Transport and storage
161