2-180 Speed Units
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
on page 2-180.
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 6
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.
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