Group 15 Analogue Outputs; Ao1 - ABB ACSM1 Firmware Manual

Group 15 ANALOGUE OUTPUTS
Settings 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% of
the 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 serial
communication link (eg, fieldbus link).
15
Firmware block:

AO1

(14)
Connects an actual signal to
analogue output AO1, and filters and
scales the output signal. Also shows
the value of the output.
Block outputs located in other
parameter groups
15.01 AO1 PTR
Selects a drive signal to be connected to analogue output AO1.
Value pointer: Group and index
15.02 AO1 FILT TIME
Defines the filtering time constant for analogue output AO1.
%
100
63
Note: The signal is also filtered due to the signal interface hardware (approximately 0.5 ms time
constant). This cannot be changed by any parameter.
0...30 s
15.03 AO1 MAX
Defines the maximum value for analogue output AO1.
0...22.7 mA
2.08 AO1
FW block:
FW block:
Unfiltered signal
Filtered signal
T
Filter time constant for AO1.
FW block:
Maximum AO1 output value.
AO1
(page 68)
AO1 (see above)
AO1 (see above)
-t/T
O = I · (1 - e )
I = filter input (step)
O = filter output
t = time
T = filter time constant
t
AO1 (see above)
Parameters and firmware blocks
105