30
When temperature control is unstable
Auto-tuning
(P: Small, I: Large)
Auto-tuning
(P: Large, I: Small)
T: Time
T: Time
T: Time
Improved temperature control
High deviation
High deviation
Low deviation
When temperature control
response is slow
Target temperature
Target temperature
Target temperature
Auto-tuning (Conceptual drawing)
P/I gain calculation coefficient (Response coefficient)
Temperature control gain P (for low deviation)
Temperature control gain I (for low deviation)
Temperature control gain P (for high deviation)
Temperature control gain I (for high deviation)
n005
n006
n007
n008
n009
–
Checking tuning conditions
Operation for stabilizing initial status
Operation for collecting control target data
Before start
Step 0
Step 1
Step 2
Calculation of temperature control gain P
and I from collected data, and writing gain
into each parameter
Step 3
–
Operation status
(Operation mode: Other than 9)
Operation status
(Operation mode: Other than 9: Same as before start)
Operation status
(Automatic operation for 2 minutes at 1% capacity)
Operation status
(Automatic operation for 10 minutes at 100% capacity)
Stop
Stop
Select a desired operation mode.
∗[Note] 1., 3.
∗[Note] 4.
∗[Note] 5.
∗[Note] 6.
After completion
T: Deviation (˚C)
T: Deviation (˚C)
T: Deviation (˚C)
Handling
Useful
Functions
For Temperature Control Improvement—“Auto-tuning mode”
Outline of the function
Depending on the system of the main machine, problems of “unstable temperature control” or “slow response in temperature
control” may be raised. In such cases, it is possible that the temperature control gain
∗
P or I setting is not suitable for the system.
∗ Temperature control gain: Coefficient to determine a control value according to deviation (temperature difference)
P: Proportional gain
I: Integral gain
In such cases, you can improve the temperature control performance by using the “Auto-tuning mode” that provides more
suitable gain settings.
Outline of operation
The auto-tuning mode executes the following steps.
Check the Oil Cooling Unit status in each step.
The auto-tuning mode automatically writes calculated values of
temperature control gain (P and I) into specified parameters.
Calculated temperature control gain P
Initial value: 2.0
Calculated temperature control gain I
Factory settings of the standard model
P: 40
I: 40
0
0
0
Item
Parameter No.
Operation Unit status RemarksStep
∗ To use the Oil Cooling Unit in normal conditions, this function is not required.
PIM00318A_EN.fm Page 30 Tuesday, October 26, 2010 12:37 PM
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