AutomationDirect DURAPULSE Series - Page 119

4–51
Example 5: Forward Run/Reverse Jog
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.
• Minimum Frequency Reference = -15 Hz (reverse)
• Maximum Frequency Reference = 60 Hz
Calculations
A) Max Output Frequency = (1750 rpm / 1750 rpm) x 60 Hz = 60 Hz
B) Analog Offset % = (-15 Hz / 60 Hz) x 100 = -25%
C) Analog Gain % = ((60 Hz – 15 Hz) / 60 Hz) x 100 = 125%
D) Mid-point Frequency = ((60 Hz – (-15 Hz)) / 2) + (-15 Hz) = 22.5 Hz
Parameter Settings
P4.01: 02 – Negative Input Offset Polarity
P4.02: 25 – 25% Analog Input Offset
P4.03: 125 – 125% Analog Input Gain
P4.04: 01 – Reverse Motion Enable
Results
Maximum Output
Frequency
60Hz
-15Hz
22.5Hz
0Hz
Forward
Reverse
0V 5V 10V
-10V 0V 10V
0mA 10mA 20mA
4mA 12mA 20mA
The negative (-) value for the Analog Offset % shows that a negative offset is needed
for P4.01.
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.
Chapter 4: AC Drive Parameters
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013