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4.25 Cooling Method Setting Function
An auto tuning calculation formula is automatically selected according to the selected cooling method during auto
tuning and the operation is started using this function.
Select one of the following characteristics:
• Air cooled: The cooling characteristic is nonlinear and cooling ability is low.
• Water cooled: The cooling characteristic is nonlinear and cooling ability is high.
• Linear: The cooling characteristic is close to the linear shape.
PID constants are calculated and executed based on this setting during auto tuning; therefore, more appropriate PID
constants can be found by setting more applicable cooling characteristic of a device.
For details on the auto tuning function, refer to the following.
Page 176, Section 4.6
(1) Setting method
Set the characteristic in Cooling method setting (Un\G719). ( Page 151, Section 3.4.2 (73))
● An auto tuning calculation formula to find PID constants is determined based on this setting; therefore, configure this
setting before executing auto tuning.
● "Air Cooled" and "Water Cooled" roughly indicate the level of the cooling ability. When a device is too cooled even if it is
set to air cooled, set the module to Water cooled (1
H
). When a device is not very cooled even if it is set to water cooled,
set the module to Air cooled (0
H
).
● In general, the ability of water cooling is higher than that of air cooling and cooling may be too strong if the same PID
constants as air cooling are used. Some time is required until the control becomes stable upon the initial start-up,
disturbance, or setting change. Therefore, in auto tuning, PID constants for when the module is set to Water cooled (1
H
)
become larger than those for when the module is set to Air cooled (0
H
).
Heating-cooling
Cooling system and cooling characteristics
0
0.2
0.4
0.6
0.8
1
0 102030405060708090100
Manipulated value for cooling (MVc) (%)
Cooling characteristics (rate
of when the manipulated value
for cooling (MVc) 100% is 1)
Complete linear
characteristics
Devices such as
cooling fans
Devices such as
electron coolers
Air-cooling
Devices such as
cooling water piping
Water-cooling
Linear