# Base excitation via keyword editor

**URL:** <https://prepomax.discourse.group/t/base-excitation-via-keyword-editor/2842>\
**Category:** General Questions\
**Tags:** dynamic\
**Created:** [July 12, 2025, 10:59pm UTC](https://prepomax.discourse.group/t/base-excitation-via-keyword-editor/2842 "2025-07-12T22:59:02Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [July 14, 2025, 6:40am UTC](https://prepomax.discourse.group/t/base-excitation-via-keyword-editor/2842/4 "2025-07-14T06:40:49Z")

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> [@Shah](#):
>
> I am a bit concerned with the statement made below in the calculix manual that the \*boundary should be pre-defined in the previous step otherwise unexpected effects may occur.

Yes, it might be safest to export the input file, delete the `*BOUNDARY, OP=NEW` keywords, add `*BASE MOTION`, submit [using standalone CalculiX](https://prepomax.discourse.group/t/using-standalone-calculix/846) and postprocess in PrePoMax.

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