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CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Description / Notes
Note that there is always a dead zone at the starting of
the curve where the frequency reference remains at the
value of the minimum frequency (P133), even when the
input signal is changed. This dead zone is only
suppressed when P133=0.00.
The internal value AI1’ that defines the frequency reference
to be used by the inverter, is given as percent of the full
scale reading and is obtained by using on of the following
equations (see P235):
Figure 6.17 - Analog Input AI1 Signal x Frequency reference.
P234
0.0 to 999
Analog Input AI1
[ 100 ]
Gain
0.1%
The analog input AI1 defines the inverter frequency
reference as shown in the curve below.
P134
P133
AI1
0
0 .................. 100%
0 ..................... 10V
(P235=0)
0 .................. 20mA
(P235=0)
4mA .............. 20mA
(P235=1)
Frequency Reference
- AI1 is given in V or mA, according to the used signal
(see parameter P235);
- GAIN is defined by the parameter P234;
- OFFSET is defined by the parameter P236.
This is shown in the block diagram below:
P235
0
0
1
Signal
(0 to 10)V
(0 to 20)mA
(4 to 20)mA
Equation
AI1'=
AI1
+
OFFSET
. GAIN
10 100
AI1'=
AI1
+
OFFSET
. GAIN
20 100
AI1'=
AI1-4
+
OFFSET
. GAIN
16 100
(
(
(
(
(
(
GAIN
P234
AI1'
OFFSET
(P236)
P235
AI1
Figura 6.18 - Block diagram of the analog input A1
(1)
This parameter can be changed only with disabled inverter (stopped motor).
