Automation Direct DURApulse GS4 User Manual page 211

a i P
nalog nPut araMeter
This example shows an application in which the drive runs full-speed forward and jogs in reverse.
The full scale of the potentiometer (or other analog signal device) will be used.
When calculating the values for the Analog Input using reverse motion, the reverse frequency
reference should be shown using a negative (-) number. Pay special attention to signs (+/-) for
values representing reverse motion.
• Minimum Frequency Reference = -15Hz (reverse)
• Maximum Frequency Reference = 60Hz
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 % = [ (-15Hz) / (60Hz) ] x 100 = -25%
Analog Input (AIx)
AIx Bias Parameter
The negative (-) value for the Analog Offset % shows that a negative offset is needed for P4.11,
P4.16, or P4.20, or a negative value in P4.10, P4.15, or P4.19. Do not use negatives in both
parameters.
C) Analog Gain % = [(60Hz – (-15Hz)) / 60Hz] x 100 = 125% = AIx Input Gain
Analog Input
Polarity
AIx Gain Parameter
D) Mid-point Frequency = [(60Hz – (-15Hz)) / 2] + (-15Hz) = 22.5Hz
Parameter Settings
Analog Input
Polarity
AIx Bias Parameter
AIx Polarity Parameter
AIx Gain Parameter
Reverse Run Parameter
* This example uses Bias = -20% and Polarity = 1: Positive Offset.
The example will work exactly the same with Bias = +20% and Polarity = 2: Negative Offset.
Examples
• Output Freq = [ (Analog_In%) x (Gain%) + (Bias%) ] x
• For AI1 set to 0~10V, and an analog input of 1 Volt:
Output Freq = [ (1/10) x (1�25) + (-0�25) ] x 60Hz = -7�5Hz
• For analog input of 7 Volts:
Output Freq = [ (7/10) x (1�25) + (-0�25) ] x 60Hz = 37�5Hz
DURA
GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
pulse
e 5: F
xaMPle orward
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)
Chapter 4: AC Drive Parameters
r /r J
un everse og
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
Parameter Settings
-25�0% *
1: Positive Offset *
125�0%
1: AI Bias FWD/REV
60Hz
22.5Hz
Forward
0Hz
Reverse
-15Hz
0V 5V 10V
-10V 0V 10V
0mA 10mA 20mA
4mA 12mA 20mA
Page 4–117