10.1 Replacing an converter
10.1.1 Overview of how to replace a converter
Permissible replacement
You must replace the converter if it continually malfunctions.
Figure 10-1 Replacing a defective converter
In the following cases you will need to replace the converter:
● The new and replaced converters have the same power rating.
● The new and replaced converters have the same frame size. The new converter has a
higher power rating than the converter it replaced.
In this case, the rated powers of converter and motor must not differ too much:
Ratio of the rated powers of the motor and the converter > 1/4
WARNING
Unexpected machine motion caused by incorrect/inappropriate converter settings
Replacing converters of different types can result in incomplete or incorrect/inappropriate
converter settings. As a consequence, unexpected machine motion, e.g. speed oscillation,
overspeed or incorrect direction of rotation. Unexpected machine motion can result in death,
injury or material damage.
● In all cases not permitted according to the above description, recommission the drive after
replacing a converter.
Corrective maintenance
10.1 Replacing an converter
SINAMICS G120XA converter
828 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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