Steel Strip Tension Control Using Bridle

Hi,

I have an application where i need to control steel strip tension (5.0mm thickness and 150mm width). For that i have two bridles placed up and down, driven by two motors.

I have S120 drive for this application. These bridles control tension. The tension feedback is given by load cell to PLC. PLC control drive using profinet communication.

Shall i go for torque mode control or speed mode control.

Can i get sample programme for this application?

Thanks in advance.

Regards,

Vinit

 You should go for torque control.

Please provide sinamic drive & CU details along with PLC so as to provide you sample program.

vinit

Hi,

I have an application where i need to control steel strip tension (5.0mm thickness and 150mm width). For that i have two bridles placed up and down, driven by two motors.

I have S120 drive for this application. These bridles control tension. The tension feedback is given by load cell to PLC. PLC control drive using profinet communication.

Shall i go for torque mode control or speed mode control.

Can i get sample programme for this application?

Thanks in advance.

Regards,

Vinit

Thanks for your reply,

I have 315-2PN/DP as PLC and S120 18A DMM drive. CU320-2PN

vinit

Thanks for your reply,

I have 315-2PN/DP as PLC and S120 18A DMM drive. CU320-2PN

Motors- Servo or induction motor?

Type of feed back - Encoder or SLVC? 

Jeff Casagrande

You want to set up a torque limit controller, not a true torque controller.  In this way, on strip break, the motor will not overspeed.  This would be for your torque master (usually top roll).  For the bottom roll, you ideally want to set up a torque follower configuration using peer-to-peer communication.  This is non-trivial to set up but the best way to do it.

 Generally speaking there are two ways of controlling Bridle rolls.

1. As suggested by Jeff Casgrande - One roll should be with Speed controller with torque limiting and 2nd roll is just a torque follower.

2. Another option is to have One as Speed controller with Torque limiting and 2nd with an independent speed controller. This is easier to implement and I personally prefer this.

The exact solution will however depend on your line configuration.

Hope this helps

Cheers
Navnag

Thanks, Jeff and Navnag,

I have following options:-

1. first with speed controller with speed limits and second as torque follower of first.
2. first with torque controller with torque and speed limits and second as toque follower of first.

If i get a sample program, it would be helpful for me.

Regards,

Vinit

I'm not sure you will find one, you have to understand the drive dynamics.  This is not a copy/paste thing.

I do agree with Navnag, maybe a better master solution would be top bridle roll as a speed regulator with tension outer loop.  Bottom roll remains a torque follower.