ABB ACS850 series, Manual

Page: 328 / 370

328 Control through the embedded fieldbus interface
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Actual values for the ABB Drives profiles
Both the ABB Drives classic profile and ABB Drives enhanced profile support the use
of two fieldbus actual values, ACT1 and ACT2. The actual values are 16-bit words
each containing a sign bit and a 15-bit integer. A negative value is formed by
calculating the two’s complement from the corresponding positive value.
The drive signals are scaled before they are written into fieldbus actual values, ACT1
and ACT2. Parameters
50.04 Fb ref1 modesel and 50.05 Fb ref2 modesel both select
the drive actual signals and define the scaling as follows:
• If you select value Speed , drive actual signal 01.01 Motor speed rpm is scaled
and written to the fieldbus actual value. The table below shows the scaling:
• If you select value Torque , drive actual signal 01.06 Motor torque is scaled and
written to the fieldbus actual value. The table below shows the scaling:
• If you select value Raw data , the fieldbus actual value ACT1 or ACT2 is the drive
actual value without scaling.
Value of 01.01 Motor speed rpm [rpm] Corresponding fieldbus actual value
ACT1 or ACT2 [integer]
value of parameter 19.01 Speed scaling 20 000
0 0
-(value of parameter 19.01 Speed scaling ) -20 000
Value of 01.06 Motor torque [%] Corresponding fieldbus actual value
ACT1 or ACT2 [integer]
100% of motor nominal torque 10 000
0 0
-(100% of motor nominal torque) -10 000
Drive value Corresponding fieldbus actual value
ACT1 or ACT2 [integer]
32 767 32 767
0 0
-32 768 -32 768