Chapter 9 Inverter Functions
9-8-4
Basic PID control setting and adjustment
1 Enabling the PID function
PID control is enabled by setting "PID enable [A071]".
When "PID enable [A071]" is set to "Enable (01)", the inverter limits the frequency command
at 0 Hz if the PID calculation result is negative.
When "PID enable [A071]" is set to "Enable (with inverted output) (02)", the frequency
command can be output in the direction of reverse rotation if the PID calculation result is
negative. (When [A071] is set to "Enable (with inverted output) (02)", the "PID output range
[A078]" is disabled.)
2 Unit conversion and scale setting when PID is enabled
When the PID function is enabled, the following parameter units change to percentage (%)
units with the maximum frequency set as 100%. In addition, set "PID scale [A075]" to apply
scale conversion as shown below. Set [A075] if necessary.
Value after conversion = Value before conversion × "PID scale [A075]"
(Note) Please note the read and write units for the above parameters change during
Modbus communication when the PID function is enabled. When writing, use units
of 0.01 Hz, and when reading, use the following percentage (%) units with the
maximum frequency set as 100%.
[d004]=0.1% (read only), [F001]=0.01%, [A011] to [A145]=0.1%
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