YASKAWA GPD515/G5 - Appendix 1: Advanced Application Notes; Part 1: Web Process Line - 1: 1 follower with a 5% draw

Digital Velocity Follower
Date: 07/01/04, Rev: 04-07 Page 8 of 13 TM.G5SW.045
Appendix 1: Advanced Application Notes
Part 1: Web Process Line - 1 : 1 follower with a 5% draw
Step 1: Calculate the Frequency Ratio
Where: dm = diameter of master roll
df = diameter of follower roll
PPRm = Master Reference Encoder pulses per revolution
GBf = Follower Gear Box ratio (motor RPM / roll RPM)
Pf = Motor poles, follower motor
GBm = Master Gear Box Ratio (motor RPM / roll RPM)
Note: If no gearbox is present, the gearbox ratio is 1
FrequencyRatio
GBf Pf dm
PPRm df GBm
=
500( )( )( )
()()()