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6 Operation and Functions
6-1. Using FIX Mode
FIX: Adjustment function without using the program function.
Pressing the
or
key on the 3-1 FIX ON/OFF screen turns OFF shown on the target value (SV) display to ON and the decimal point of the
rightmost digit blinks. Then, press the
ENT key, and the decimal point stops blinking to register the selection. (When OFF is set for FIX on this
screen, the program mode turns ON.)
Pressing the
key calls the next setting screen. Set a necessary item, if any.
When the display returns to the basic screen upon completion of setting, is shown on the pattern number display and the FIX mode is ON.
6-2. Setting Target Value (SV) (FIX Mode)
Setting on the basic screen
When the
or
key is pressed on the 0-0 basic screen, the decimal point of the rightmost digit blinks and the numerical value changes. The value
keeps changing while either of the keys is being pressed. Once an intended value is reached, press the ENT key to register it. The registration of the data
stops the blink of the decimal point.
Setting on the SV setting screen
When the
or
key is pressed on the 3-2 FIX SV setting screen, the decimal point of the rightmost digit blinks and the numerical value changes.
The value keeps changing while either of the keys is being pressed. Once an intended value is reached, press the
key to register it. The registration of
the data stops the blink of the decimal point.
* In the program mode, SV value is unable to be changed on the basic screen.
* In the program mode, the 1-1 start SV setting screen and the 2-1 step SV setting screen should be used to set an SV.
* No target value can be changed while auto tuning (AT) is in execution. It should be set after releasing AT.
6-3. Setting Output Manually
For switching between auto and manual, press the
key continuously for 3 seconds (in the state of RUN) on the output monitoring screen.
During manual output, the MAN lamp lights and it goes out when automatic output begins.
To set a target value, press the
or
key on the output monitoring screen. When the target value is reached, the setting completes. To release it, press
the
key again for 3 seconds continuously, and automatic output is resumed.
* Changing to manual output is not possible while auto tuning is in execution.
100% output is shown as
and the decimal point of blinks.
When OFF is set for proportional band (P) in the case of contact output or SSR drive voltage output, the value of output is either 0.0% or 100.0%.
When OFF is set for proportional band (P) in the case of voltage output or current output, the output value becomes the lower or higher limit value of a set
output limiter.
Supplementary Explanation of Monitoring Screen
The output monitoring screen (OUT) and automatic output/manual output:
1) When auto is changed to manual, output is in balanceless action and an output value immediately before the change is displayed. When manual is changed to
auto, output is in bumpless action if it is bumpless. If it is outside the proportional band, however, the output is not in bumpless action.
2) In case power supply was turned OFF and power is applied again, control output is in the mode (either manual or auto) which was ON at the time of
interruption of power supply.
NOTE: Even in the manual mode, it is possible to call another screen but it should be noted that control output is in the manual state. Blinking of the MAN
action LED shows that the manual mode is ON.
6.4. Auto Tuning (AT)
This is the function to automatically calculate and set P.I.D. values, i.e., parameters of PID control. The time required for calculation depends on the details of
control.
Execution of AT
Pressing the
key on the AT execution setting screen changes OFF shown on the target set value (SV) display to ON and the decimal point on the
rightmost digit blinks. Upon pressing the
key, the decimal point stops blinking and AT action begins. When the target set value stays in the inclined
portions (portions indicated by the arrows of the action display), AT is in the state of standby (the AT lamp lights), and AT is executed while the target set
value stays in the level portion (the AT lamp blinks).
While AT is in execution, the ON/OFF action of output is repeated several times in accordance with rise and fall of the measured value from the target
value as the border and PID values are stored in an internal memory. Immediately when they are stored, control using these PID values begins and AT
action ends. Then, the target set value display shows OFF and the AT lamp goes out. (In case there is AT still to be executed, it is put in the state of
standby.)
