ABB AC Drive - Model ACS550
ABB AC Drive - Model ACS550
(OP)
I want to run this unit through a PLC which isnt the problem. One thing I want to do is be able to control the motor speed manually with a pot through the PLC. Does anyone know which input this is on the the ACS550 drive?





RE: ABB AC Drive - Model ACS550
"The perfect is the enemy of the good." -- Voltaire
RE: ABB AC Drive - Model ACS550
I see AI1 which is labeled as an "External Frequency Reference 0-10V".
Would this be it?
RE: ABB AC Drive - Model ACS550
Isn't this quite an expnsive piece of hardware to be winging it, espcecially when the manuals are available online?
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If we learn from our mistakes I'm getting a great education!
RE: ABB AC Drive - Model ACS550
The plan is to run a POT through the PLC for manual operation - otherwise the PLC will run the motor.
RE: ABB AC Drive - Model ACS550
There are configuration settings that may need to be set to tell the drive which inputs are going to be used, but there are "macro" configuration selections that simultaniously set the most often used combinations.
RE: ABB AC Drive - Model ACS550
I think this would the best set up Macro for a manual/auto PLC run configuration.
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
Your best choice would be to stay with the factory default macro ABB Standard since this defaults to a simple two-wire (open-the drive stops; close-the drive runs), a separate forward/reverse input and the speed reference on AI1.
AI1 defaults to 0-10VDC which makes a simple 1/1 conversion in the PLC. If you would rather have the PLC link to the drive with a 4-20ma signal, you will need to do the additional signal transformation and offsetting and then set the little yellow switches at the end of the drive terminal strip toward the inside of the drive (away from the edge). That converts the input to a ma rather than a voltage input. The default will give you 0-20ma which makes the math and offsetting easier in the PLC. If you want a true 4ma for the minimum speed, go to Group 13 Parameter 01 and change it to 20% (4ma is 20% of full scale 20ma).
I don't know where the start/stop or forward/reverse is coming from but the will connect to Digital Input 1 (DI1) and Digital Input 2 (DI2) respectively.
RE: ABB AC Drive - Model ACS550
You could use either of those macros and add the second analog input, analog input selection and set 20% input = min speed for 4-20 ma. Or you could use just one analog input and have the PLC control just one analog speed command from either the pot or the other speed control scheme.
RE: ABB AC Drive - Model ACS550
What do you mean by this? Hook the POT through the PLC and use the PLC to either "read" from the POT or run the motor speed dependent upon whatever the PLC tells it to?
I could use 2 seperate outputs from the PLC - 1 for manual POT operation and 1 for Auto mode - and use sub routines to keep it from trying to reasd both the POT and whatever was programmed.
RE: ABB AC Drive - Model ACS550
Further along in this thread, it started to sound like you would have "manual" and "automatic" modes. Manual where the speed is controlled by the pot, and Auto where the PLC (without the aid of the pot) calculates a speed and sends it to the drive.
Please clarify which of these is your plan. Or maybe you desire something else. We can help you but knowing what result you desire is essential.
RE: ABB AC Drive - Model ACS550
I was going to just use ABB Standard and have 2 constant speed selections but the "bosses" are requesting more. I can set up a PLC to the ABB with no problem using the constant speed selections but when it comes to using a pot pick speeds and interfacing it all together is where I get a little foggy.
Thanks to everyone in advance for helping me out here. I appreciate you guys taking time out of your schedules.
RE: ABB AC Drive - Model ACS550
If you are going to use both constant speed input selections and an analog input, you may need an input to tell the VFD whether to use the analog input or the constant speed input. However, the "all open" state of the constant speed input may cause the drive to use the analog input. I would need to check the manual to see exactly how that can be set up.
RE: ABB AC Drive - Model ACS550
I may scrap the idea of the POT and do what youre talking about with multiple inputs. Set up lots of different test speeds and run the test bench like that.
RE: ABB AC Drive - Model ACS550
When that switch is open, the drive looks to Analog Input 1 Terminal 2 for its speed command, and when that switch is closed, it looks to Analog Input 2 for its speed command.
You will notice that the Start/Stop and Forward/Reverse is also on different terminals depending on whether that switch on DI3 is open or closed. If you want them to both be on the same terminals so only the speed command moves, let me know and I'll give you the Parameters to change.
On the other hand, if all you want is up to seven fixed speeds, then use the ABB Standard (default) Macro and we will help you configure the inputs for seven fixed speeds. The default is three fixed speeds but it is easy to change that to seven.
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
I suppose it doesnt really matter to me. Whichever route is the easiest.
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
Or, you could choose the Hand/Auto macro which looks for a speed command on AI1 when in the hand mode and on AI2 when in the Auto mode. If you connect a simple pot to AI1 and your PLC to AI2, you will have one or the other depending on the switch on DI3.
So, its up to you. What do you want/need?
RE: ABB AC Drive - Model ACS550
So really, I'll just need to wire a POT to it? It cant be that easy - it never is for me.
RE: ABB AC Drive - Model ACS550
RE: ABB AC Drive - Model ACS550
If you close the connection to DI3, then the speed signal is on AI2 and Start/Stop is on DI6. That can be configured differently but the above is the default setup.