Parameters and firmware blocks137Group 15 ANALOGUE OUTPUTSSettings for the analogue outputs.The drive offers two programmable analogue outputs: one current output AO1(0…20 mA) and one voltage output AO2 (-10…10 V).The resolution of the analogue outputs is 11 bits (+ sign) and the inaccuracy is 2% ofthe full scale range.The analogue output signals can be proportional to motor speed, process speed(scaled motor speed), output frequency, output current, motor torque, motor power,etc. It is possible to write a value to an analogue output through a serialcommunication link (eg, fieldbus link).15Firmware block:AO1(14)Connects an actual signal toanalogue output AO1, and filters andscales the output signal. Also showsthe value of the output.Block outputs located in otherparameter groups2.08 AO1 (page 94)15.01 AO1 PTR FW block: AO1 (see above)Selects a drive signal to be connected to analogue output AO1.Value pointer: Group and index15.02 AO1 FILT TIME FW block: AO1 (see above)Defines the filtering time constant for analogue output AO1.Note: The signal is also filtered due to the signal interface hardware (approximately 0.5 ms timeconstant). This cannot be changed by any parameter.0…30 s Filter time constant for AO1.15.03 AO1 MAX FW block: AO1 (see above)Defines the maximum value for analogue output AO1.0…22.7 mA Maximum AO1 output value.AO1 25TLF7 2 msec (8)< 15.01 AO1 PTR[ CURRENT PERC ](1 / 1.05)15.02 AO1 FILT TIME[ 0.100 s ]15.03 AO1 MAX[ 20.000 mA ]15.04 AO1 MIN[ 4.000 mA ]15.05 AO1 MAX SCALE[ 100.000 ]15.06 AO1 MIN SCALE[ 0.000 ]2.08 AO163%100T tFiltered signalUnfiltered signal O = I · (1 - e -t/T)I = filter input (step)O = filter outputt = timeT = filter time constant
