328 Control through the embedded fieldbus interface Actual values for the ABB Drives profilesBoth the ABB Drives classic profile and ABB Drives enhanced profile support the useof two fieldbus actual values, ACT1 and ACT2. The actual values are 16-bit wordseach containing a sign bit and a 15-bit integer. A negative value is formed bycalculating the two’s complement from the corresponding positive value.The drive signals are scaled before they are written into fieldbus actual values, ACT1and ACT2. Parameters 50.04 Fb ref1 modesel and 50.05 Fb ref2 modesel both selectthe drive actual signals and define the scaling as follows:• If you select value Speed, drive actual signal 01.01 Motor speed rpm is scaledand 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 andwritten 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 driveactual value without scaling.Value of 01.01 Motor speed rpm [rpm] Corresponding fieldbus actual valueACT1 or ACT2 [integer]value of parameter 19.01 Speed scaling 20 0000 0-(value of parameter 19.01 Speed scaling) -20 000Value of 01.06 Motor torque [%] Corresponding fieldbus actual valueACT1 or ACT2 [integer]100% of motor nominal torque 10 0000 0-(100% of motor nominal torque) -10 000Drive value Corresponding fieldbus actual valueACT1 or ACT2 [integer]32 767 32 7670 0-32 768 -32 768
