# Cyclic behavior during switching

**URL:** <https://forum.plexim.com/t/cyclic-behavior-during-switching/1609>\
**Category:** PLECS\
**Created:** [December 12, 2024, 7:38pm UTC](https://forum.plexim.com/t/cyclic-behavior-during-switching/1609 "2024-12-12T19:38:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![amru\_sakthi](https://avatars.discourse-cdn.com/v4/letter/a/d6d6ee/32.png) [@amru\_sakthi](https://forum.plexim.com/u/amru_sakthi)\
**Post date:** [December 12, 2024, 7:38pm UTC](https://forum.plexim.com/t/cyclic-behavior-during-switching/1609/1 "2024-12-12T19:38:51Z")

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I have designed a multilevel inverter. I have done thermal modelling of IGBT and diode. When the load is reduced it shows 'Cyclic behavior during switching ’ error. When the load is increased it works normal. I have set variablestepdiscreate ode23tb solver, and tightened the tolerance and diode turn on threshold.Please help me to resolve this error.

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**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [December 16, 2024, 5:14pm UTC](https://forum.plexim.com/t/cyclic-behavior-during-switching/1609/2 "2024-12-16T17:14:10Z")

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Thanks for sharing the investigations you’ve done so far. Based upon your response it sounds like you have already reviewed the [general FAQ on this error message](https://www.plexim.com/support/solutions/146). A model would be necessary for further debugging insights.