G120: how to properly scale the setpoints to ensure both drives operate in harmony

------------------------------------------------------------------------------------------
Split from parameter to convert from Rpm to Hz.

anil02573

Dear Siemens Support,

We have recently added a G120 drive to our existing setup, which includes an MM440 drive. The MM440 drive operates with a frequency setpoint range of 0 to 50 Hz, while the G120 drive operates with an RPM setpoint range of 0 to 1000 RPM.

When we attempt to increase or decrease the setpoints simultaneously for both drives, they do not operate correctly due to the difference in their respective units (frequency for MM440 and RPM for G120).

Could you please provide guidance on how to properly scale the setpoints to ensure both drives operate in harmony when controlled with the same digital inputs? Additionally, can the G120 drive's setpoint be changed from RPM to frequency to match the MM440 drive? 

 Are both of the drives controlled with Profibus or Profinet? If yes, then just scale the speed setpoint for the MM440, 0-50hz to be scaled to 0-16384 as the engineering value you send to the drive control word for speed.
For the G120, 0-1000rpm to be scaled to 0-16384 as the engineering value you send to the drive control word for speed.
Then both drives should follow the speed identically. Of course the ramp need to be the same also, and be sure that the ramp reference is the same, so the actual ramps behave the same.

Find and change the set r0002 = r0024 below