ABB ACS550 Drive ModBus Control

Hi guys please help me with RPM Reference Calculation
Please send Order No for doing your work.

OR,
RPM = How fast you want the motor to go, but would be determined by the max rotational limits of the motor/load combination

Operator SP = 100%
Motor RPM = (OpSP * NamePlate/100)

Really though, if you are programming a application to control a VSD from a PC based application, and you don't know how to determine the RPM...... đź““
 
"How to set Reference for Speed... i have selected REF1... Do the calculation depends on ? "


The speed reference scale is factory set at 0-20000 dec or 0-4E20 Hex for REF 1(Fwd) ( see page 228 asc550 2009 user manual).

If your motor max speed is 1775 rpm, 1775=20000

Next, you have to convert ref value to Hex and write at word adr 40002
 
@Mike77

Final Clarification...

There is a Register for MIN and MAX RPM at 2001 & 2002.if i'm correct.. we have to set a MIN and MAX RPM supported by Motor and we can calculate REF Value from this as posted above... AM i Right..
 
Registers 2001 & 2002 will only limit the nominal speed defined at parameter 9908 (nominal speed of the motor).

If you want to scale the speed reference, set the maximum speed at parameter 1105 for ref1.


Otherwise, you will need to convert the user input reference.

i.e motor nominal speed: 1775 rpm Ref1: 20000

1775/20000= 0.08875

Ref1= User input(0-1775)* 0.08875
 
"Otherwise, you will need to convert the user input reference.
i.e motor nominal speed: 1775 rpm Ref1: 20000
1775/20000= 0.08875
Ref1= User input(0-1775)* 0.08875"

Sorry... Ref1 would be = 0-1775/0.08875
 
I do programming in GX developper for ABB drive model ACS 550 control via modbus communication,I can read the Data of drive parameters and other running variables but when i go to write the data into drive for start/Stop or speed reference its not wrriten on to the drive i feel helpless now please suggest what i will do now ???

Thanks in advance
 
Speed reference clarified

How to set Reference for Speed... i have selected REF1... Do the calculation depends on

1104 Ref1 Min
1105 Ref1 Max

2001 RPM Min
2002 RPM Max


EXT1 &2. ARE TWO DIFFERENT CONTROL MODES.
USING EXT1 YOU COULD CONTROL SPEED USING PUSH BUTTONS(SPEED UP/DOWN) AND ANALOG I/P s (0-10V/4-20mA)

Meanwhile using ext2 you can control through Modbus
And vice versa.

And on ext 1 reference you could use either 1104&1105
On ext 2 reference you have to set 1107 & 1108

Coming to 2001 and 2002, those are limits ,which your drive would considers and trips off whenever RPM EXCEEDS THE LIMIT.It is same for both ext1 and ext2.
 

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