30
Useful
Functions
Handling
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)
n05
n06
n07
n08
n09
–
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
: De
viation (
˚
C)
T
: De
viation (
˚
C)
T
: De
viation (
˚
C)
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: 7.0
Calculated temperature control gain I
Factory settings of the standard model
P: 120
I: 120
0
0
0
Item
Parameter No.
Operation
Unit status
Remarks
Step
∗
To use the Oil Cooling Unit in normal conditions, this function is not required.
PIM00132A_EN.fm 30 ページ ２００７年９月２０日 木曜日 午後３時４分
