Rockwell Automation 20D PowerFlex 700H and 700S Frame 9...14 Drives - Manual (Page 43)

Rockwell Automation Publication PFLEX-IN006E-EN-P - July 2013 43
Control Wiring for PowerFlex 700H Drives Chapter 2
When digital input 4 is low, the drive runs in automatic mode, consuming the
speed reference from the communications adapter. When digital input 4 goes
high the drive takes the last value from the communication adapter and loads it
into the HIM. So, the manual speed reference produced by the HIM starts at the
last value produced by the communication adapter.
Application Note:
To facilitate a smooth transfer from manual HIM speed reference back to
automatic (communicated) speed reference, you will need to execute the
following in controller logic:
• While the drive is in manual mode, the controller will need to continually
transfer the speed feedback or output frequency into its speed reference.
This will eliminate any disturbance in the speed when the drive goes from
manual mode back to automatic mode.
Auto/Manual Notes
• Manual control is exclusive. If a HIM or terminal block takes manual
control, no other device can take manual control until the controlling
device releases manual control.
• If a HIM has manual control and power is removed from the drive, the
drive will return to Auto mode when power is reapplied.
• Parameter 192 [Save HIM Ref ] can enable manual mode to allow starts
and jogs from the HIM in 2-wire mode.