7-16
Chapter 7. PARAMETER SETUP
• Position-proportional control dead zone
On 2G output models, a dead zone between the motor open and mo-
tor 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 con-
trol results and motor service life into consideration when setting
the dead zone.
• Heat-cool control dead zone
-100 to +50 %
Heat-cool control is calculated as follows:
MFB (%)
*
Dead zone
Open-side
relay ON
Closed-side
relay ON
Control output (%)
*: Dead zone setting value
*
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)
