Ai1 - ABB ACSM1 Firmware Manual

116
Group 13 ANALOGUE INPUTS
Settings for the analogue inputs.
The drive offers two programmable analogue inputs, AI1 and AI2. Both inputs can be
used either as a voltage or a current input (-11...11 V or -22...22 mA). The input type
is selected with jumpers J1 and J2 respectively on the JCU Control Unit.
The inaccuracy of the analogue inputs is 1% of the full scale range and the
resolution is 11 bits (+ sign). The hardware filter time constant is approximately 0.25
ms.
Analogue inputs can be used as the source for speed and torque reference.
Analogue input supervision can be added with standard function blocks. See chapter
Standard function blocks.
13
13 ANALOGUE INPUTS
Firmware block:

AI1

(12)
Filters and scales the analogue input
AI1 signal and selects the AI1
supervision. Also shows the value of
the input.
Block outputs located in other
parameter groups
13.01 AI1 FILT TIME
Defines the filter time constant for analogue input AI1.
%
100
63
Note: The signal is also filtered due to the signal interface hardware (approximately 0.25 ms time
constant). This cannot be changed by any parameter.
0...30 s
13.02 AI1 MAX
Defines the maximum value for analogue input AI1. The type is selected with jumper J1 on the JCU
Control Unit.
-11...11 V / -22...22 mA
Parameters and firmware blocks
[ 0.000 s ]
[ 10.000 mA ]
[ -10.000 mA ]
[ 1500.000 ]
[ -1500.000 ]
2.04 AI1
2.05 AI1 SCALED
FW block:
Unfiltered signal
Filtered signal
T
Filter time constant for AI1.
FW block:
Maximum AI1 input value.
AI1
TLF7 2 msec
13.01 AI1 FILT TIME
13.02 AI1 MAX
13.03 AI1 MIN
13.04 AI1 MAX SCALE
13.05 AI1 MIN SCALE
(page 80)
(page 80)
AI1 (see above)
-t/T
O = I · (1 - e )
I = filter input (step)
O = filter output
t = time
T = filter time constant
t
AI1 (see above)
23
(6)
2.04 AI1
2.05 AI1 SCALED