Spindle speed issues

I am having VFD Spindle speed issues with my 5PRO. I am trying to run a file with a 1/4" EM running at 18000. When I start the program it will on ramp up to 33.5 and I have to stop the program. Does anyone have any ideas why this would be happening?
Thank you.

Do other g-code files have this same issue? Have you tried to start your spindle through the MDI, m3s18000?

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What is the speed in the gcode of the file? In CC you can see what the tool is set for by editing the tool and see what the speed is. If the speed of the tool is correct you can see what the commands in CC are in the preview. I have pro so I can see the gcode but not sure if you have the free version if you can see the gcode in the preview. Also what is the outcome of what @Zombie suggested about the MDI manual input?

Does the VFD operate normally on other files?

I have figured the problem is with the file. Thank everyone for their help.

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