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Chapter 7. PARAMETER SETUP
7-13
● D I F F
• ON-OFF control differential
When P is set to 0.0 on both 0D and 6D output models, control is set to ON-OFF control,
and operational period at that time is set.
Differential
gap
PV
OFF
ON
Reverse action
Differential
gap
PV
OFF
ON
Direct action
SPSP
• Position-proportional control dead zone
On 2G output models, a dead zone between the motor open and motor closed positions is
set.
As a general guideline, the minimum value is the value where this dead zone changes to
stop motor hunting once a fixed value set to manual output is being output.
If this value is set without any margin, the motor will be operating at all times, which will
considerably shorten its service life.
The factory setting is 5%. Use this as a guideline, and take the control results and motor
service life into consideration when setting the dead zone.
MFB (%)
*
Dead zone
Open-side
relay ON
Closed-side
relay ON
Control output (%)
*: Dead zone setting value
*
• Heat/cool control dead zone
On heat/cool models, this sets how the relationship between heat-side output and cool-
side output should be processed with respect to the MV resulting from PID operation.
Heat-cool control is calculated as follows:
PV
SP
Heat-side
output
Cool-side
output
MV
(PID operation result)
Dead zone
Heat-cool output calculation
PID set selection
(1 of 4 sets)
Heat-side PID set
Constants OL, OH
Constants P, I, D, Re
PID operation
(fixed to reverse action)
Cool-side
PID set
Heat-side
PID set
Cool-side PID set
Constants OL, OH
Note 2)
Note 4)
Note 3)
Note 1)