6. Function Description
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6.5.5 Process PID control
Process PID controller is added ouside the speed control loop and a wide variety of process control can be
implemented without using the stand-alone PID controller outside the speed control loop or PLC. ‘Process PID Enb’ at
CON_20 determines whether Process PID controller is enabled or not. ‘Process PID Enb’ at CON_20 can be set as
follows.
(Example) programming CON_20 “Process PID Enable/Disable”
RUN/STOP command
CON_20 (Proc PID Enb)
ON OFF
Disable Disable Disable
Enable Enable Disable
Terminal
Depending on terminal
definition
Disable
If ‘Process PID Enb’ at CON_20 is set to ‘Terminal’, Process PID controller is enabled using ’Proc PID Dis’, which is
the one of the functions of the multi-function terminal input. To avoid the saturation of the process PID controller,
process PI controller is enabled only when the multi-function terminal is set to ‘Proc PID Dis’ and the terminal is ‘OFF’
and the run command is ‘ON’.
Multi-function input terminal defined as
“Proc PID Dis”
RUN/STOP command
Input signal ON OFF
ON Disable Disable
Defined
OFF
Enable Disable
Not defined Disable Disable
The command to Process PID controller uses the digital value (CON_10) set using the keypad or the analog value
(‘Process PID F/B’) which is the one of the multi-function analog output. The setting range of Process PID digital input at
CON_11 is from –100 to100% and the setting range of analog input command is from –10 to 10V.
Code LCD display Description Setting range Unit Factory setting
CON_11 Proc PID Ref
Process PID Reference Source
(Keypad)
-100.0 ~ 100.0 % 0.0
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