WEG CFW-10 EASYDRIVE User Manual page 68

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
P234
Analog Input AI1
Gain
68 (1)
This parameter can be changed only with disabled inverter (stopped motor).
Range
Description / Notes
0.0 to 999 The analog input AI1 defines the inverter frequency
[ 100 ] reference as shown in the curve below.
0.1%
Figure 6.17 - Analog Input AI1 Signal x Frequency reference.
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):
- AI1 is given in V or mA, according to the used signal
- GAIN is defined by the parameter P234;
- OFFSET is defined by the parameter P236.
This is shown in the block diagram below:
AI1
P235
Frequency Reference
P134
P133
0
0 .................. 100%
0 ..................... 10V
0 .................. 20mA
4mA .............. 20mA
P235 Signal
0 (0 to 10)V
0 (0 to 20)mA
1 (4 to 20)mA
(see parameter P235);
OFFSET
(P236)
Figura 6.18 - Block diagram of the analog input A1
AI1
(P235=0)
(P235=0)
(P235=1)
Equation
(
(
AI1 OFFSET
. GAIN
AI1'= +
10 100
(
(
AI1 OFFSET
. GAIN
AI1'= +
20 100
(
AI1-4 OFFSET
AI1'= +
16 100
P234
GAIN
(
. GAIN
AI1'