Cooling Method Setting Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.8

Cooling Method Setting Function

At the execution of auto tuning, an auto tuning operational expression is automatically selected depending on a selected
cooling method and an operation is started.
Select one of the following methods:
• Air cooling: Select this method when cooling characteristics are a non-linear shape and cooling capacity is low.
• Water cooling: Select this method when cooling characteristics are a non-linear shape and cooling capacity is high.
• Linear: Select this method when cooling characteristics are close to a linear shape.
Cooling characteristics (rate
of when the manipulated value
for cooling (MVc) 100% is 1)
1
0.8
0.6
0.4
0.2
0
0
At the execution of the auto tuning, PID constants are calculated based on this setting and the auto tuning is executed.
Therefore, more suitable PID constants can be calculated by the setting according to the cooling characteristics of the device.
For details on the auto tuning function, refer to the following:
Page 38 Auto Tuning Function
Setting method
Configure the setting as follows:
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Heating/cooling control setting] 
[Cooling method setting]
• An operational expression of the auto tuning for the calculation of PID constants is determined based on this
setting. Thus, always configure this setting before the execution of the auto tuning.
• Air cooling and water cooling roughly indicate the level of the cooling ability. When a device is too cooled
even though air cooling has been selected, set Water cooling (1H). When a device is less likely to be cooled
even though water cooling has been selected, set Air cooling (0H).
• Generally, the ability of water cooling is higher than that of air cooling and cooling may be too strong when
the same PID constants as the one for air cooling are used for water cooling. It takes time until the control
becomes stable upon the first start-up, disturbance, or setting change. Therefore, the auto tuning calculates
PID constants so that the PID constants of when Water cooling (1H) is set become larger than the ones of
when Air cooling (0H) is set.
1 FUNCTIONS
34
1.8 Cooling Method Setting Function
Cooling system and cooling characteristics
Water-cooling
Devices such as
cooling water piping
10 20 30 40 50
Manipulated value for cooling (MVc) (%)
60 70 80 90 100
Air-cooling
Devices such as
cooling fans
Linear
Devices such as
electron coolers
Complete linear
characteristics