Hitachi WJ Series User Manual page 230

Chapter 9
Basic PID control setting and adjustment
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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.
d004
A023
A031
(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%.
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Value after conversion = Value before conversion × "PID scale [A075]"
F001 A011
A024 A025
A032 A033
[d004]=0.1% (read only), [F001]=0.01%, [A011] to [A145]=0.1%
9-8-4
A012 A020
A026 A027
A034 A035
Inverter Functions
A220 A021
A028 A029
A101 A102
A022
A030
A145