Omron SYSDRIVE 3G3RV, User Manual

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6
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n
PID Feedback Loss Detection
When
performing PID control, be sure to use the PID feedback loss detection function. If PID feedback is lost,
the
Inverter output frequency may accelerate to the maximum output frequency.
When
setting b5-12 to 1 and the status of the PID feedback value detection level in b5-13 is insufficient and
continues
for the time set in b5-14, an FbL (PID feedback reference lost) alarm will be displayed on the Digi-
tal
Operator and Inverter operation will continue.
When
b5-12 is set to 2, an FbL (PID feedback reference lost) error alarm will be displayed on the Digital
Operator,
the error contact will operate, and Inverter operation will be stopped.
The
time chart for PID feedback loss detection (set b5-12 to 2) is shown below.
Fig 6.77 PID Feedback Loss Detection Time Chart
n
PID Sleep
The
PID sleep function stops the Inverter when the PID sleep function delay time continues while the PID
control
target value is at an insufficient level to operate the PID sleep function. When the PID sleep delay time
continues
and the PID control target value is above the PID sleep function operation level, Inverter operation
will
automatically resume.
When
PID control is disabled, the PID sleep function is also disabled. When using the PID sleep function,
select
decelerate to stop or coast to stop as the stopping method.
The
PID sleep time chart is shown below.
Fig 6.78 PID Sleep Time Chart
PID feedback value
Loss detection
level
b5-13)
Loss detection time
b5-14)
No FbL
detection
FbL detection
Time
Loss detection time
b5-14)
PID target value
Sleep operation
level b5-15
Sleep operation
delay time Sleep operation
delay time
Run command has been input
Operation status output
Internal run command
External run command
Operating
Operation Stopped
b5-16 b5-16