WEG CFW-09 User Manual page 163

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
P234
Analog InputAI1 Gain
164
Range
Unit Description / Notes
b) Active Dead Zone P233 = 1
When the Analog Input AI4 is programmed for -10 V to +10 V (P246 = 4),
the curves shown in figure 6.27 are still valid, with the difference that with
AI4 negative the direction of rotation is reversed.
0.000 to 9.999
[ 1.000 ]
0.001
AIx
P235
P243
P246
OFFSET (P236, 244, P247)
The internal values AI1', AI3', and AI4' are the results of the following
equation:
For example: AI1 = 5 V, Offset = -70 % and Gain = 1.00:
AI1' = -2 V, means that the motor will run in reverse with a reference
equal to 2 V.
Reference
P134
P133
0
0 ..................................... 10 V
0 ................................... 20 mA
4 mA .............................. 20 mA
10 V .................................. 0
20 mA ................................ 0
20 mA ............................. 4 mA
Figure 6.28 a) and b) - Actuation of the analog inputs
P234, P242, P245
GAIN
+
+
Figure 6.29 - Block diagram of the analog input AI1, AI3, AI4
AIx' = (AIx + OFFSET x 10 V) x Gain
100
AI1' = (5 + (-70) x 10 V) x 1 = -2 V
100
Alx Signal
AI1' - P018
AI3' - P020
AI4' - P021