ABB ACSM1 - Group 15 ANALOGUE OUTPUTS; Ao1

Parameters and firmware blocks
137
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
2.08 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 index
15.02 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 time
constant). 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
25
TLF7 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 AO1
63
%
100
T
t
Filtered signal
Unfiltered signal
O = I · (1 - e
-t/T
)
I = filter input (step)
O = filter output
t = time
T = filter time constant