Measuring The Insulation Resistance Before Commissioning - Siemens SIMOTICS FD 1LL1 Operating Instructions Manual

Start-up

7.2 Measuring the insulation resistance before commissioning

● The minimum insulation resistance values are within tolerance.
● Minimum air clearances have been maintained.
● Any supplementary motor monitoring devices and equipment have been correctly
● All brakes and backstops are operating correctly.
● At the monitoring devices, the values for "Warning" and "Shutdown" are set.
Converter operation
● If the design of the motor requires connection to a particular converter type, the rating plate
● The converter is correctly parameterized. The parameterization data is specified on the
● Any supplementary motor monitoring devices and equipment have been correctly
● In continuous operation, the motor cannot exceed the specified upper speed limit n
Cooling
● Check that the machine cooling is available for commissioning.
7.2 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 46)
92
connected and are functioning correctly.
will contain corresponding additional information.
rating plate of the machine. Information about the parameters is available in the operating
instructions for the converter.
connected and are functioning correctly.
undershoot the lower speed limit n
The permissible acceleration time to the limit speed n
assignment.
.
min
depends on the parameter
min
or
max
SIMOTICS FD 1LL1
Operating Instructions 04/2016