AutomationDirect DURAPULSE Series User Manual page 119

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.
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 = -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%
The negative (-) value for the Analog Offset % shows that a negative offset is needed
for P4.01.
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
1st Ed. Rev. D 05/2013
60Hz
22.5Hz
0Hz
-15Hz
0V 5V
-10V 0V
0mA 10mA 20mA
4mA 12mA 20mA
DURA
PULSE
Chapter 4: AC Drive Parameters
Forward
Reverse
10V
10V
AC Drive User Manual
4–51