MT6M15962a
1. Troubleshooting
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An IPM has various integrated protection functions (such as over current protection and over heating
protection) unlike a standard IGBT module, it shuts down safely in the case of abnormal conditions.
However, it may be destroyed depending on the abnormality of the failure that occurred. When the IPM
has failed, it is necessary to take countermeasures upon clarification of the situation and find the root
cause of the breakdown.
Failure tree analysis charts are shown in Figure 7-1. Carry out the investigation of the failure mode by
using these charts. For the failure criteria, see Chapter 4, Section 2 [IGBT test procedures] of the IGBT
Module Application Manual (RH984).
Furthermore, when an alarm signal output is generated from the IPM, investigation of the root cause
by referring to the alarm factor analysis chart in Section 3 of this chapter can be done.
This chapter describes the troubleshooting.
7-2
2. Failure tree analysis charts
Fig.7-1 IPM failure tree analysis chart
(Symbols A to F are linked with those indicated in separate FTA pages.)
