17
Cooling side proportional band coefficient
(DUAL type only) (Setting range: 0, 0.1 to 100.0)
[Description]
• Cooling side proportional band co-
efficient can be set automatically by
auto-tuning.
• Cooling side proportional band can
be set (see diagram (a) below).
• To set cooling side proportional
band, its coefficient should be ob-
tained to optimum control from the
following equation after setting
heating side proportional band.
· Heating side proportional band is
.
· Set the coefficient to 0, and the
cooling side is put in ON-OFF
action.
Example) Altering cooling control proportional band co-
efficient of 5.0 to 5.5
Key operation
Description
Press the SEL key to display P.
Press the SEL key repeatedly until
is displayed.
Press the or key to display
5.5.
Press the DATA key once.
Current data (5.0 coefficient) is
displayed.
Press the SV key when you need to
display the operation status display.
After pressing the ENT key, the
cooling side proportional band
coefficient is registered.
Operation will be started with 5.5
coefficient.
Display
SEL
ENT
SV
DATA
SEL
Output
Setting (SV)
Heating side
Cooling side
Coefficient 0.5
Coefficient 1.0
Coefficient 2.0
Deviation
(–)
Deviation
(+)
Heating side
proportional
band
Cooling side
proportional
band
Proportional band (P)
(a)
Proportional band (P)
2
Example) Set cooling side propor-
tional band to 10% of full
scale by proportional band
(P) = 50%.
Proportional band (P)
2
Cooling side proporitona band =
×
Coefficient
Therefore, Coefficient = 0.4
50%
2
10% =
×
Coefficient
Related parameter: P (Page 6)
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