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What is the difference between the pre ramp frequency reference and the frequency reference on the ATV630 and ATV930 drives?

Published date: 03 June 2020

Difference between "pre-ramp" and frequency reference process drives.

Product Line:
Altivar ATV630 and ATV930 drives


HMI will display both which one means what one is HMI freq ref and the other is normal freq ref. 


[Pre-Ramp Ref Freq] FrH
Frequency reference before ramp (signed value).
Actual frequency reference linked to the motor regardless of which reference channel has been selected.
This parameter is in read-only mode


Ref Frequency] LFr
Reference frequency.
This parameter only appears if the function has been enabled. It is used to change the speed reference
from the remote control.
OK does not have to be pressed to enable a change of reference.

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