Operation
8/05 DC1010/1020/1030/1040 Product Manual 21
3.4.3 Control Types
3.4.3.1 Manual Operation
In the manual mode, the operator directly controls the controller output level.
Press the “A/M”key until you see “OUTL” in the upper display and a fixed control
output value in the lower display.
SETSET
To change the value of the Output (%), refer to Paragraph 3.4.1.1 Changing Parameter
Value.
Press the “SET” key to save the value.
3.4.3.2 ON/OFF Control
ON/OFF is the simplest control type. The output can be either ON (100 %) or OFF (0
%). The Process Variable (PV) is compared with the setpoint (SP) to determine the sign
of the error (ERROR = PV–SP). The ON/OFF algorithm operates on the sign of the error
signal.
The output type must be the relay output (DC10X0XX-1XX-XXX-X).
See ‘Configuration 1” Mode (Table 4-1). Change ‘P’ value to 0. Until PV reaches SP, the
control output is just ON (100%), and then the control output becomes OFF (0%).
* To prevent the control ouput from flickering too frequently, set the hysteresis ‘HYS1’
in ‘Operation’ mode (Table 3-3).
3.4.3.3 PID Control
PID control is the default control type of this controller.
PID is normally used for three-mode control. This means that the output can be adjusted
somewhere between 100 % and 0 %. It applies all three control actions—Proportional
(P), Integral (I), and Derivative (D)—to the error signal.
See ‘Configuration 1” Mode (Table 4-1). Set the PID Values “P”, “I”, “D”, “db”, and
“CYC”.
Auto Tuning
See ‘Operation” Mode (Table 3-3). Set ‘AT’ prompt to ‘YES’. The auto tuning process
will start. After the auto tuning is completed, the controller gets optimum PID values for
the control system and starts the operation automatically.
Auto tuning allows the controller to automatically adjust the PID parameters, and is
suitable for use when temperature control is not accurate enough.
See ‘Configuration 1’ Mode (Table 4-1). Prompt ATVL = auto tuning offset. It will be
deducted from the Set Value [SV] (it can prevent overshoot during auto tuning)
SV-ATVL=Auto-tuning value, ATVL=auto tuning offset
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