• Check that the supplementary equipment and devices to monitor the machine are correctly
connected and are functioning correctly.
• In continuous operation, carefully ensure that the motor cannot exceed the specied upper
speed limit n
max
or fall below the lower speed limit n
min
.
The permissible acceleration time to the limit speed n
min
depends on the parameter
assignment.
7.1.1 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 rst 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" (Page64)
7.1.2 Checking the machine cooling
Cooling
• Carefully check that it is guaranteed that the machine is cooled when it is being
commissioned.
See also
Preparing for use (Page41)
7.1.3 Commissioning the separately driven fan
The separately driven fan ensures that the main machine is cooled irrespective of the main
machine speed or direction of rotation. The separately driven fan is only suitable for one
direction of rotation.
Commissioning
7.1Measures before commissioning
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 97
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