Dear sir,

We supplied sectional drives with PLC to one of our customer ,  details are mentioned below,

PLC - S7 315-2PN/DP on profinet

Yankee Roll:

G130  CU-320-2PN (6SL3040-1MA01-0AA0)

Power Module 6SL3310-1GE33-0AA0

Motor :132Kw

Suction Press:

s120 cu320-2PN  96SL3040-1MA01-0AA0)

Power Module 6SL3210-1PE31-8UL0

Motor: 75Kw

Wire :

Power Module 6SL3210-1PE31-8UL0

Motor: 75Kw

Programming :

1) Yankee is in speed control with encoder mode(Master)

2) Suction press is in speed control with encoder mode(slave with torque limit)

3) Wire is in speed control with encoder mode(slave with torque limit)

4) 65-35 % load sharing between Yankee and Press

5) Speed Reference : Yankee(master)- Wire - Press

We are facing speed synchronization (4-5 MPM) problem between Yankee and Suction Press to rectify this problem we checked below condition,

1) Set MPM of both the drive are same(255 MPM) , in actual feedback from encoder Yankee achieve 255 mpm but suction press not achieving set mpm(actual mpm 251) ,to achieve this we increased torque limit from 100% to 160% but still same problem.In this condition load sharing is ok but facing speed synchronization problem.

2) We takeout torque limit of suction press and trying  to mach Yankee and press speed,in this condition speed synchronization is ok  but then facing load sharing problem, suction press takes load of both roll.

Please advice me for above problem, also find the attached drive program file