PID control is enabled when parameter F360 is assigned (to VIA or VIB).
If PID is enabled, then any reference that comes on the channel selected by FMOD (or alternatively selected by parameter F207 providing that F200=1 or logic function 38 is used) represents the desired process value, which means PID reference. If the preset speed is activated at this moment when PIC control is active, then the preset speed does not represent the speed in Hz but it represents the PID reference, proportionally to the max speed setting. For example, if the feedback is connected to VIB, (parameters F210-F213 in default), then the preset speed 20Hz corresponds to 40% of the feedback range (40% = 20Hz out of 50Hz) providing that F201-F203 are also kept in default values.
Using this setting (F360=1), assigning preset speed (for example F112=6, F113=7 or you can combine run fwd+preset speed, e.g. F111=22) and defining preset speed SR1, SR2,.. you can regulate application using preset PID references.
If there is the intention to switch to speed mode (to regulate speed, not process value) you have to disable PID control by assigning free logic input to function 14. If this logic is active, ATV works in speed mode and so reference on FMOD or F207 or preset speed - all represent target speed setpoint in Hz.
If PID is enabled, then any reference that comes on the channel selected by FMOD (or alternatively selected by parameter F207 providing that F200=1 or logic function 38 is used) represents the desired process value, which means PID reference. If the preset speed is activated at this moment when PIC control is active, then the preset speed does not represent the speed in Hz but it represents the PID reference, proportionally to the max speed setting. For example, if the feedback is connected to VIB, (parameters F210-F213 in default), then the preset speed 20Hz corresponds to 40% of the feedback range (40% = 20Hz out of 50Hz) providing that F201-F203 are also kept in default values.
Using this setting (F360=1), assigning preset speed (for example F112=6, F113=7 or you can combine run fwd+preset speed, e.g. F111=22) and defining preset speed SR1, SR2,.. you can regulate application using preset PID references.
If there is the intention to switch to speed mode (to regulate speed, not process value) you have to disable PID control by assigning free logic input to function 14. If this logic is active, ATV works in speed mode and so reference on FMOD or F207 or preset speed - all represent target speed setpoint in Hz.
發佈於: 施耐德電機Taiwan
