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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 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?
From this, 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 64)
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 2 years, the grease in the bearings will not deteriorate.
• For motors with thermal class 155, for normal ambient temperatures, use a lithium-soap
rolling bearing grease with a dropping point of at least 180 °C.
• For machines with thermal class 180, and for certain special machines, use the special grease
specified on the machine lubricant plate.
4.5.5.3
Regreasing rolling bearings after storage periods of up to two years
• For machines with regreasing systems, briefly lubricate both bearings after commissioning
with the machine 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 machine.
4.5.5.4
Releasing the rotor shipping brace before commissioning
If one is being used, release the rotor shipping brace before commissioning.
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A
Preparing for use
4.5 Transport and storage
49
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