Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 65)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 65
Drive Configuration Chapter 1
automatically adds this time delay and makes sure that the system is ready to start
before it receives the command.
Using Hand-Off-Auto with Auto/Manual
To take control of the drive speed when switching from Auto to Hand on the H-
O-A switch, the Auto/Manual feature can be used. See
Auto/Manual on page 27
for more on Auto/Manual Control.
In the circuit below, a speed potentiometer was added to the analog input to
provide a speed reference to the drive. When the H-O-A switch is moved from
Auto to Hand, the digital input block requests manual control and issues a start
command to the drive. If the digital input port receives manual control, the drive
accelerates to the reference speed from the analog input. All attempts to change
the speed except from the analog input are blocked. If the drive is stopped while
in Hand, switch the H-O-A switch to Off and then back to Hand to restart the
drive.
If another port has manual control of the drive, but does not have exclusive
ownership of the logic commands (due to P326 [Manual Cmd Mask]), turning
the switch to Hand causes the drive to begin moving but for the analog input to
have no control over the speed.
+24V
H A
O
XOO
XOO
OOX
DI 0: Stop
DI 1: HOA Start
+24V
+10V
H A
O
XOO
OOX
XOO
DI 0: Stop
DI 1: HOA Start and
Manual Control
Analog IN 0: DI Manual
Speed Reference
Speed Potentiometer