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4
Chapter
Cooling Proportion Band Coefficient
Sets the cooling proportional band coefficient
• Range: 0.0 to 100.0
The relationship between heating control output and cooling
control output is outlined below.
Cooling proportional band is set after the optimal value for
heating proportional band is set.
The following example shows how the cooling proportional
band is calculated.
Example: What is the coefficient that will give a cooling
proportional band of 10% when proportional band
(P) = 50% with full scale cooling
10% = (50%/2) x Coefficient
Coefficient = 0.4
To set cooling as a secondary operation, set "
CCC
CooooLLLL
" to 0.0.
With two outputs set as P=0.0 and CoL=0.0, heating and
cooling outputs become ON/OFF actions (2 state action). In
this situation, the ON/OFF hysteresis is 0.5% FS (fixed) for
heating and cooling outputs. The point of operation for the
heating output can be shifted with the “hys” parameter. The
point of operation for the cooling output can be shifted with
the “db” parameter.
Setting Cooling Proportional Band
Cooling proportional band = (Proportional band(P)/
2
) x Coefficient
Caution
This setting is valid when there are dual outputs.
(The standard types are only units where the sixth digit of the
model number is A, C, E, or P.)
proportional band (P)
heating
proportional
band
cooling
proportional
band
MV
output
cooling
heating
coefficient 0.5
50
coefficient 1.0
coefficient 2.0
OFF
HYS
DB
OFF
PV
cooling output
(OUT2)
heating output
(OUT1)
0.5%
ON
0.5%
ON
1
Press and hold the
key to display the setup
mode channel menu ("
ooo
oPPPPEEEE CCCChhhh 1111
"), then use the
keys to display Pid ("
PPP
Piiiidddd CCCChhhh 2222
").
Refer to
See p. 31 in this chapter for information on how to display
the channel menu.
2
Press and hold the
key to display P ("
PPP
P
") then
use the
keys to display CoL ("
CCC
CooooLLLL
").
Specify the cooling proportional band coefficient.
3
Press the
key, then use the
keys to set
the cooling proportional band to "2.5".
The cooling proportional band is set to "2.5°C".
4
Press the
key to confirm the setting.
5
Press the
key to return to the operation mode
PV/SV display.
Содержание PXG4
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Страница 154: ...153 17 Chapter Chapter 17 Appendix Delay Start Function 154 Return to Factory Default Setting Function 155...
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