Operation On A Converter With A Low Pulse Frequency - Siemens SIMOTICS 1PQ8 Operating Instructions Manual

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
7.2.1

Operation on a converter with a low pulse frequency

Risk of explosion as a result of 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.
An explosion can occur in operation. This can result in death, serious injury or material
damage.
● Observe the data on the machine rating plate.
● Never fall below the minimum pulse frequency. This means that you avoid exceeding the
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 15) are followed before working on the motor.
● The bearing insulation should be implemented as shown on the plates.
SIMOTICS TN Series N-compact 1PQ8
Operating Instructions 11/2018
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.
WARNING
temperature class, and as a consequence igniting an explosive atmosphere.
WARNING
.
min
depends on the parameter
min
Start-up
7.2 Converter operation
or
max
91