Digital Velocity Follower
Date: 07/01/04, Rev: 04-07 Page 9 of 13 TM.G5SW.045
Step 2: Determine drive parameters P1-01 & P1-02
If Frequency Ratio ≥ 1
P1-01 = 10000
P1-02 = 10000 / Freq. Ratio
If Frequency Ratio < 1
P1-01 = Freq. Ratio * 10000
P1-02 = 10000
EXAMPLE:
On a paper machine, a nip roll (follower roll) has to follow master roll with a 5% fixed draw.
Nip (follower) roll diameter = df = 16.0”
Master roll diameter = dm = 34.078”
Master encoder pulses per revolution = PPRm = 1024
Gearbox between the follower motor and the follower will cause the motor shaft to turn
4.048 turns for one turn on the follower roll.
GBf = motor / roll = 4.048 / 1 = 4.048
Follower motor has 4 poles = Pf = 4
Gearbox between master motor and the master roll will cause the motor shaft to turn 7.5
turns for one turn of the master roll.
GBm = motor / roll = 7.5 / 1 = 7.5
Frequency Ratio is greater than 1, so:
P1-01 = 10000
P1-02 = 10000 / 2.245 = 4454 (rounded to nearest whole number)
P1-03 = 5.0% (to achieve the 5% fixed draw)
FrequencyRatio ==
500 4 048 4 34 078
1024 160 75
2 245
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