ACS601 : how to regulate the "resistive torque" by acting on speed ?
I am coming back to you live because i hope for an answer to the folowing question.
Thank you in advance.
by fradin.machine Rank: 2804 on 2/24/2021 9:02:49 AM
You understood well.
Following your advice, I will therefore choose the Torque regulation mode ==>
This drive receives a Torque reference from the Pannel.
The speed is corrected to keep the torque constant
99.02 (TORQUE CONTROL) 99.04 (DTC)
10.02 (EL1P, 2P) 10.03 (Forward)
11.01 (Ref2%) 11.02 (EXT2) 11.06 (Local)
13… .. (range + scale adjustment)
14.01 (Speed Limit1) SR11 activation according to parameters 32.01 and 32.02
15… .. (signals to be connected to the analog outputs)
20… .. (limitations)
32.01 (below) 32.02 (rpm value) supervision
The machine cycle should therefore be:
1- starting with a clean filter, the speed starts from 0, it increases within the limit of the setpoint torque until all the inertias are overcome.
2- the speed stabilizes at the level imposed by the torque setpoint
3- gradually, the filter becomes dirty so the regulation will decrease the speed to maintain the torque at the setpoint level
4- when the speed will reach a preset threshold, the RO1 will give information to the PLC which will generate the automatic filter change cycle
5- we then find ourselves in situation 2, the speed is increased since the torque regulation allows it, we start again with a clean filter
I am on the right track ?
first of all... I have been working just with ACS600 multidrive system firmware, so I have no practical experience with ACS600 Standard FW. I assume your drive is not a multidrive, just single standard drive.
I think you are on the right track with parameters you wrote.
Torque macro is OK, but the drive should not stay without any speed control. Because in case of a load drop, the speed must be controlled to avoid too high speed that may break your machine.
My first idea was setting torque limit at Speed controller output as is possible in the multidrive firmware.
But, in the Standard firmware surprisingly there are no Torq limit Min, Max parameters at the output of Speed controller.
However the same function can be achieved by setting Torque limiter 60.02 to "Minimum" selection.
In this case Torque selector=min will work as a automatic voter between speed control (during acceleration and stopping) and between Torque control (limiting torque during operational speed)
Little shortcoming of using Torq selector=Min is that the drive acceleration may take longer time if the torque is limited already.
I hope it helps.