Automation Direct DURApulse GS4 User Manual page 213

a i P
nalog nPut araMeter
This example illustrates how to provide a positive offset of the Analog Input, while using the full
scale of the potentiometer or other analog device. At the same time, the Maximum Frequency
Reference is limited by reducing the Analog Input Gain.
When the analog signal is at its lowest value, the set-point frequency will be at 11.5Hz. When the
analog signal is at its maximum value, the set-point frequency will be 39.6Hz.
• Minimum Frequency Reference = 11�5Hz
• Maximum Frequency Reference = 39�6Hz
For AI1, AI2, and AI3: P4.24 (AI V/Hz Calculated Selection) MUST BE SET TO ZERO (All Inputs
Use Bias and Gain) TO ENABLE BIAS AND GAIN CALCULATIONS.
Calculations (see
A) Drive Maximum Output Frequency = P0.04 = (1750 rpm / 1750 rpm) x 60Hz = 60Hz
B) Analog Offset % = (11.5Hz / 60Hz) x 100 = 19.2%
Analog Input (AIx)
AIx Bias Parameter
C) Analog Gain % = [(39.6Hz – 11.5Hz) / 60Hz] x 100 = 46.8% = AIx Input Gain
Analog Input
Polarity
AIx Gain Parameter
D) Mid-point Frequency = [(39.6Hz – 11.5Hz) / 2] + 11.5Hz = 25.6Hz
Parameter Settings
Analog Input
Polarity
AIx Bias Parameter
AIx Polarity Parameter
AIx Gain Parameter
Reverse Run Parameter
Examples
• Output Freq = [ (Analog_In%) x (Gain%) + (Bias%) ] x
• For AI1 set to 0~10V, and an analog input of 5 Volts:
Output Freq = [ (5/10) x (0�468) + (0�192) ] x 60Hz =
• For analog input of 10 Volts:
Output Freq = [ (10/10) x (0�468) + (0�192) ] x 60Hz
DURA
GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
pulse
e 7: P
xaMPle ositive
page 4–112 for formulas)
AI1 AI2
P4�10 P4�15
AI1
Positive (+) Positive (+)
P4�12
AI1 or AI2 or
Positive (+) Positive (+)
P4�10 P4�15
P4�11 P4�16
P4�12 P4�17
Max_Out (Hz)
25�6Hz
= 39�6Hz
Chapter 4: AC Drive Parameters
o r a
FFset with educed nalog
AI3
P4�19
AI2 AI3
Positive (+) Negative (-)
P4�17 P4�21 P4�22
AI3
Positive (+) Negative (-)
P4�19
P4�20
P4�21 P4�22
P4�09
Results
Maximum
Output
Frequency
Maximum
Frequency 39.6Hz
Reference
25.6Hz
11.5Hz
Positive Offset
g
ain
Parameter Settings
19�2%
1: Positive Offset
46�8%
0: Digital FWD/REV
60Hz
30Hz
0Hz
0V 5V
-10V 0V
0mA 10mA
4mA 12mA
Page 4–119
10V
10V
20mA
20mA