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There is a machine with some servodrives.

The maitenance team says that ventilation(internal fan) do not work. they tested them unmounting the unit and concluded that the fan is working properly out of the drive.

Searching on the internet I have not found the correct guide to solve the question:

the fan is controlled by software, by temperature?

is it triggered by anything? which are the conditions to turn it on?

If you have any source or manual I would be thankful.

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