Yaskawa 2Y25-0423.pdf User Manual
Page 8

Rel. 09/15/2000 Page 8 of 13 Doc. No. 02Y00025-0423
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 gear box ratio is 1.
FrequencyRatio
GBf
Pf dm
PPRm df GBm
=
500(
) (
) (
)
(
) ( ) (
)
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