Table of Contents
Advertisement
● Any supplementary motor monitoring devices and equipment have been correctly
● In continuous operation, the motor cannot exceed the specified upper speed limit n
7.2.1
Operation on a converter with a low pulse frequency
NOTICE
Increased motor temperature
If the pulse frequency is less than the rated pulse frequency, then increased motor losses
occur. This results in a higher motor temperature.
● Reduce the power to prevent exceeding the temperature class and to avoid consequential
● Contact the Service Center if necessary.
Dangerous voltage via the converter
As long as the feeding converter is switched on, or the DC link of the converter is not
discharged, there can be a voltage at the motor terminals even when the rotor is not moving.
The voltage is up to 1000 V, depending on the converter type.
Ensure that the five safety rules (Page 13) are followed before working on the motor.
● The bearing insulation should be implemented as shown on the plates.
7.3
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?
SIMOTICS TN Series N-compact 1LH8
Operating Instructions 06/2017
connected and are functioning correctly.
undershoot the lower speed limit n
The permissible acceleration time to the limit speed n
assignment.
premature thermal aging of the insulation.
WARNING
7.3 Measuring the insulation resistance before commissioning
.
min
depends on the parameter
min
Start-up
or
max
75
Advertisement
Table of Contents
