Preparing for use
4.5 Transport and storage
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
33
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 (Page 45)
4.5.5.2
Regreasing rolling bearings after storage periods of up to two years
•
For motors with regreasing systems, briefly lubricate both bearings after commissioning
with the motor running as a precautionary measure.
•
Grease type, grease quantity and relubrication intervals for the regreasing system are
stamped on the rating plate attached to the motor.
4.5.5.3
Releasing the rotor shipping brace before commissioning
If one is being used, release the rotor shipping brace before commissioning.
