ABB Uncompromised Productivity Challenge, Episode 1 – DTC


ABB claims that their industrial drive ACS880 provides uncompromised
productivity I say, let’s put it to the test.
Ever heard about a bull in a china shop? Sure, but how about a 6-ton elephant? For accurate control, information about motor speed and torque is essential. This is usually provided by external devices, such as encoders or resolvers. In this test there are none.
We have three ACS880 drives controlling the three electric motors of the crane, all without feedback devices.
ABB claims that everything you need for extremely accurate control is already built into the drives.
And that means you are saving money and space.
Plus you get better control over your process. Uncompromised productivity, as we like to say. Mike, you work for ABB, so I’m not going to take your word for it. I want to see it for myself.
Bring in Jimbo! Not exactly a ballerina, is he?
He has obviously been eating well, and over two meters wide, he barely squeezes between the shelves. And now he has to pass through 64 meters of test track.
And over 720 shelf meters of china ready to be smashed into pieces. Okay Jimbo, let’s go shopping! So far so good.
Yes, this is the easy part. Now we are getting to the corner.
You are slowing down.
Yup, that’s because I can. That is one of the advantages of DTC.
You can drive very slowly and maneuver very accurately at the same time.
DTC sniffs its stator’s flux and motor current, and uses the information to calculate
the required torque and speed. If the values don’t match with the target,
DTC balances the motor back to its’ track in less than 20 microseconds. Good boy Jimbo! You said that DTC gives highly accurate control at low speeds.
Sure. The drive has very high static and dynamic speed accuracy.
Right… Can you drive and control it at a really low speed? Even with no speed.
That does not make sense.
Sure it does. What it means is you can start up the motor at full torque. That is the trickiest situation you can have for your crane.
The trickiest? Let’s test it!
Let me introduce you to Mr Ming-Head!
We are going to witness an experiment that ABB does not recommend.
The movement of the hoist must always be secured by feedback that guarantees correct performance.
In this case, however, we will see an exception in order to demonstrate DTC’s capabilities. Okay, we want to lower Jimbo now onto Mr Ming-Head’s head.
That’s it, gently does it. You don’t want to hurt Mr Ming-Head. And stop! Now apply the brake.
So, he mechanical brake holds Jimbo in place, and Mr Ming-Head is safe so long as the brake is engaged. Right?
Yeah, correct. The thing is that even if the brake fails, DTC will save our brave man.
Because DTC recognizes the new situation in microseconds?
Exactly.
Okay. 3-2-1-go. He is safe! Good boy, Jimbo! Sorry, yeah… Way to go drive!
I’m disappointed. That was too easy. It was only easy because of DTC.
With any other drive we would sweeping up bits of china right now.
Well, maybe it was the application?
How does the drive work with a winch or a conveyor
or any other application? Trust me.
The drive has specific control programs for numerous applications; so uncompromised productivity is available for any typical industrial application.
Even for potentially explosive atmospheres. Well, I have to say “uncompromised productivity” sounds a little bit gibberish. The whole idea of this drive is to control processes as efficiently as possible, saving electricity and boosting productivity.
For some applications they can save up to 60% of energy
costs 60%!?
Only if the drive is operating as it was meant to be. I think I’m going to have to say it now… I think you should. Does ABB’s ACS880 drive provide uncompromised productivity? I say it does! Go ahead and watch the next episodes.
I promise Jimbo will have a much tougher time. And for more about uncompromised productivity click for ABB´s website.

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5 thoughts on “ABB Uncompromised Productivity Challenge, Episode 1 – DTC”

  • Ахаха, АББ отправило слона в посудную лавку! Зачем? Да чтобы показать возможности частотника ACS880)

  • I use ACS580-01-145A-4 to drive 55kW motor. The motor is for Luffing Jib Boom Crane. The boom is 40 m long, weight 4 ton and to carry Bucket of Coal at about 9 ton.
    Total ratio from reducer and multi sheaves pulley is, 1:350.
    The torque output of gearbox motor is 17.987 Nm.
    In its maximum load, the tension (inertia or moment?) to winch motor is about 12.000 Nm.

    I use ABB Standard Vector Macro, but in the parameter of Scale is still 50, not 1500 like in document said. So the maximal speed of the motor only 50 Rpm.

    In that preset, for command lifting, it is okay. After the brake open, the motor pulling/lifting the boom upward and stopping it is as good as starting.

    1st problem when trying to lowering the load. Load is the boom only.
    After the brake open, the boom instantly move downward and pulling out the motor.
    But it happened in less of half a second. The Inverter responded and then correcting the downward speed according the input command from the joystick at about 0.6 sec.

    Stop command is just fine,

    2nd problem, when I try to change the parameter 12.20 from 50 to 150, in downward command, after the brake open, the boom instantly move downward and pulling out the motor and no respond and correcting speed from inverter what so ever. It stoped as I hit the ESD button to activate the electric mechanical brake.

    Can you help me sir?

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