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Temperature Controller METICOM CTI Series
Chapter 6 Temperature Control Operations
6.1 Control Modes
[
Auto
]
:
This type of control is a “closed-loop” system and requires a thermocouple feedback signal.
The controller uses a PID algorithm to determine the required output power to hold the actual
temperature value equal to the setpoint.
This mode is applied on all zones when the system starts to work.
[Standby]
:
This type of control is similar to Auto mode. It is a “closed-loop” system and requires a thermocouple
feedback signal.
The controller uses a PID algorithm to determine the required output power to hold the actual
temperature value equal to standby temperature value (70% of setpoint).
[
Manual
]
:
This type of control is an “open-loop” system and requires no thermocouple feedback signal.
The controller regulates output power according to the manual setting.
This mode only can be selected by zone setting.
Auto Tune function:
This function is for getting the optimal PID value for a system.
It is a “closed-loop” system and requires a thermocouple feedback signal.
Generally, AT function only needs to be executed when PID factory setting cannot meet the system
requirements.
After finished auto tuning, the optimal PID value is saved, and the controller returns to Auto mode.
This function only can be selected by zone setting.
Note
：
To start PID auto-tuning function, present temperature value should be lower than set point.