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5 Advanced Operations
• When the Automatic Filter Setting parameter is set to "OFF"
• When the RUN/STOP parameter is set to "STOP"
• When auto-tuning (AT) has been executed
• When the display is moved to the Initial Setting Level or Manual Control Level
• When a sensor error occurs
• When the temperature variations cannot be eliminated
• When the power supply is turned OFF
Calculations for the input digital filter will not be performed if the following things occur at startup.
• When the process value is not close to the set point
• When the SP ramp operates
Using Automatic Filter Adjustment
Automatic filter adjustment will be performed with the following operation.
Execute auto-tuning in advance. Refer to 4-9-1 AT (Auto-tuning). Or, if you are also using adaptive control, make
preparations for adaptive control in advance. (Refer to 5-3 Performing Adaptive Control)
Operating Procedure
Initial
settings*
*For example, setting startup conditions.
• Automatic filter adjustment performed.
1
Press the M Key several times in the Adjustment Level to dis-
play fa (Automatic Filter Adjustment).
2
Press the U or D Key to select on (ON).
The
will be set automatically.
3
When adjustments have been completed, the
will go out.
The Automatic Filter Adjustment parameter will automatically return
to off (OFF).
Precautions for Correct Use
• If you use automatic filter adjustment, do not use manual operation to change the PID
constants that were automatically set by auto-tuning. It may not be possible to suppress
hunting in some cases.
• If you perform automatic filter adjustment when there is a continuous deviation between the
process temperature and set point*, the input digital filter may not be adjusted correctly.
Turn ON automatic filter adjustment when the process temperature is close to the set point.
*
Examples of continuous deviation are given below.
Example 1: Heat cannot escape, so the temperature declines only slowly.
Example 2: The power supply to the heater is not turned ON.
• If a MV change rate limit has been set, the input digital filter may not be adjusted correctly.
• If there are water drops or similar object on the temperature sensor, the input digital filter may
not be adjusted correctly.
5 - 6
Complete
Execute
auto-tuning.
auto-tuning.
indicator will light and the Input Digital Filter parameter
Increase the
Start
temperature.
packing.
Adjustment Level
indicator
E5@D Digital Temperature Controllers User's Manual (H224)
Automatic filter
adjustment
performed.
fa
Automatic Filter
Adjustment
off
fa
on
fa
off
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