Speed units, Start inhibits, Start permissives – Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual User Manual
Page 176: Start inhibits start permissives, Permissive conditions
Speed Units
176
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
Speed Units
[Speed Units] selects the units to be used for all speed related
parameters. The options for [Speed Units] are:
•
“Hz” – converts status parameters only to Hz.
•
“RPM” – converts status parameters only to RPM.
•
“Convert Hz” - converts all speed based parameters to Hz, and changes the
value proportionately (i.e. 1800 RPM = 60 Hz).
•
“Convert RPM” - converts all speed based parameters to RPM, and changes
the value proportionately.
Start Inhibits
The [Start Inhibits] parameter indicates the inverted state of all start permissive
conditions. If the bit is on (HI or 1), the corresponding permissive requirement
has not been met and the drive is inhibited from starting. It will be updated
continually, not only when a start attempt is made. See also
Start Permissives
Start permissives are conditions required to permit the drive to start in any mode
– run, jog, auto-tune, etc. When all permissive conditions are met the drive is
considered
ready to start. The ready condition is available as the drive ready
status.
Permissive Conditions
1.
No faults can be active.
2.
No type2 alarms can be active.
3.
The TB Enable input (if configured) must be closed.
4.
The DC bus precharge logic must indicate it is a start permissive.
5.
All Stop inputs must be negated (See special Digital Inputs Stops
Configuration issues below).
6.
No configuration changes (parameters being modified) can be in-progress.
If all permissive conditions are met, a valid start, run or jog command will start
the drive. The status of all inhibit conditions, except for item
above, are
reflected in the output parameter Start Inhibits. The configuration change
condition is a transient (short-term) condition and not directly user controlled. It
is therefore not reflected in the Start Inhibits parameter.
Note that the Start Inhibits conditions do not include any of the functionality
imposed by the DPI logic such as owners, masks, local control, etc.
Vector