User`s guide

111
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
P234
0.00 to 9.99
Analog InputAI1
[ 1.00 ]
Gain
0.01
The analog inputs AI1 and AI2 define the inverter
frequency reference as shown in the curves presented in
the parameter P233 (figure 6.17 and figure 6.18).
The internalvalueAIx’thatdefinesthe frequencyreference
to be used by the inverter, is given as percent of the full
scalereading andisobtained byusingoneof thefollowing
equations (refer to the parameters P235 and P239):
P235/P239
0
0
1
Signal
0 to 10 V
0 to 20 mA
4 to 20 mA
Equation
AIx' =
GAIN
.
AIx
+
OFFSET
10
100
AIx' =
GAIN
.
AIx
+
OFFSET
20
100
AIx' =
GAIN
.
AIx- 4
+
OFFSET
16
100
Table 6.17
- Definition of the analog input signal
AI1 (P235) and AI2 (P239)
where:
- x = 1, 2.
- AIx is given in V or mA, according to the used signal
(refer to the parameters P235 and P239).
Figure 6.18 -
Analog input response with Active (P233 = 1) Dead
Zone
P134
Reference
0
Alx Signal
0
................
10 V
0
................
20 mA
4 mA
...........
20 mA
P133
- GAIN is defined by the parameters P234 and P238 for
AI1 andAI2 respectively.
- OFFSET is defined by the parameters P236 and P240
forAI1 andAI2 respectively.
This is shown in the figure 6.19.
Figure 6.19
- Block diagram of the analog inputs AI1 and AI2
GAIN
P234, P238
AIx'
OFFSET
(P236, P240)
P235
P239
AIx