Speed limit in torque mode

HI ALL,

I am using ACS 380 in DTC mode and want to use in torque mode.

when there is no load on motor the motor runs at full rpm. so my question is that suppose when there is no load the motor should run at its line speed. If possible how to do that?


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swapnil   

asked 1 month ago
Closed



Best Answer

1

Hi,

keep the drive in speed mode and set your torque setpoint into torque limit 30.20 and the same but negative torque to 30.19. (this is torque limiter behind speed controller)

Set speed setpoint 2-3% higher than line speed.

As a result the speed controller output will be all the time limited (it means drive will provide preset torque) in case there is mechanical contact with the produced material.

If the drive loose mechanical contact with produced material it will keep speed setpoint.

see also

http://www402.abbext.com/Torque-constant-tension-ACS800-q1795150.aspx

I hope it helps

kamil.herman   

answered 1 month ago


 


By swapnil on 8/7/2017 | Like (0) | Report

Well the motor which is being run in torque mode is used for winding purpose and if the material tears away there will be no load on the motor and it will run in full speed so is there any way i can limit the speed.

NOTE: Torque signal is give to AI2 of the drive.


By kamil.herman on 8/7/2017 | Like (0) | Report

Solution I described in my previous post is suitable for Winder. All you need is to transfer signal from AI2 to 2 parameters 30.19, 30.20 (the output limiter of Speed controller) by Adaptive programming in ACS drive.

If material is being winded Speed controller will be limited. In other words the drive will be in torque mode. Drive Torque will follow parameter 30.20.

If the material tears away output of Speed controller will drop down from limit and will take over speed control of the motor.


By swapnil on 8/10/2017 | Like (0) | Report

i will try out your solution sir. one thing i need to make clear is thatshould i keep my drive in speed mode?


By kamil.herman on 8/10/2017 | Like (0) | Report

Hi, thanks for rating my answer.
Yes, keep Torque selector in Speed mode. I hope it helps.


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Answers

0

Hi
generally, in torque mode you have the first AI to give  the drive the speed reference for the motor and the 2nd AI to give the drive the torque reference to use, scaled 0 - 100%.

If I have correct understand, when you not have load at motor, also with the minimum reference for the torque at 2nd AI, the motor run at the speed that you have selected with the first AI - speed reference

Flavio Mussolin   

answered 1 month ago


 


By swapnil on 8/7/2017 | Like (0) | Report

Exactly when there is no load even with 5% torque the motor runs at full rpm so what should be the way so that i will be able to limit it at some minimum speed otherwise it may cause accidents.


Add New Comment


1

Hi,

keep the drive in speed mode and set your torque setpoint into torque limit 30.20 and the same but negative torque to 30.19. (this is torque limiter behind speed controller)

Set speed setpoint 2-3% higher than line speed.

As a result the speed controller output will be all the time limited (it means drive will provide preset torque) in case there is mechanical contact with the produced material.

If the drive loose mechanical contact with produced material it will keep speed setpoint.

see also

http://www402.abbext.com/Torque-constant-tension-ACS800-q1795150.aspx

I hope it helps

kamil.herman   

answered 1 month ago


 


By swapnil on 8/7/2017 | Like (0) | Report

Well the motor which is being run in torque mode is used for winding purpose and if the material tears away there will be no load on the motor and it will run in full speed so is there any way i can limit the speed.

NOTE: Torque signal is give to AI2 of the drive.


By kamil.herman on 8/7/2017 | Like (0) | Report

Solution I described in my previous post is suitable for Winder. All you need is to transfer signal from AI2 to 2 parameters 30.19, 30.20 (the output limiter of Speed controller) by Adaptive programming in ACS drive.

If material is being winded Speed controller will be limited. In other words the drive will be in torque mode. Drive Torque will follow parameter 30.20.

If the material tears away output of Speed controller will drop down from limit and will take over speed control of the motor.


By swapnil on 8/10/2017 | Like (0) | Report

i will try out your solution sir. one thing i need to make clear is thatshould i keep my drive in speed mode?


By kamil.herman on 8/10/2017 | Like (0) | Report

Hi, thanks for rating my answer.
Yes, keep Torque selector in Speed mode. I hope it helps.


Add New Comment



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