Rockwell Automation 1336 3-20HP FRN 1.01-3.01 - Manual (Page 74)

Operation
Chapter 7
7-4
Turning the speed potentiometer will adjust or set drive output frequency if
the speed pot has been selected and is functional.
Programming and Display
Panel
Freq P R
Enter P R
All Programming and Display Panels provide a means of displaying
different drive status conditions while providing pushbutton control for
selected viewing and parameter programming.
The Freq display is a three character display that shows:
Standby Status Display
The standby status of the drive when it is waiting for a drive start or jog
command.
Freq P R
Output Frequency Display
The drive output frequency appears when the drive is running.
Freq P R