Honeywell DCP301 User Manual page 98

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.
• 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.
Closed-side
relay ON
• 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:
Heat-side
PID set
Constants P, I, D, Re
PV
(fixed to reverse action)
SP
Reverse action
Differential
gap
SP
Dead zone
*
MFB (%)
Cool-side
PID set
Note 3)
PID operation
(PID operation result)
Chapter 7. PARAMETER SETUP
Direct action
ON
OFF
PV
SP
*: Dead zone setting value
Open-side
relay ON
*
PID set selection
(1 of 4 sets)
Heat-side PID set
Constants OL, OH
Heat-cool output calculation
MV
Dead zone
ON
OFF
Differential
gap
PV
Control output (%)
Note 4)
Note 2)
Cool-side PID set
Constants OL, OH
Heat-side
output
Cool-side
output
Note 1)
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