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7.5 MODULE 5 - C OOLING (S ECONDARY ) P ARAMETERS ( 5-O2 )
5-O2
PARAMETER MENU
CNFP
CYC2
COOLING
CYCLE
TIME
gAN2
COOLING
RELATIVE
GAIN
db-2
HEAT/COOL
DEADBAND/
OVERLAP
??? to 2???? seconds
???? to ????
To enable Cooling in Heat/Cool applications, theAlarm 2Action must first
be set for Cooling. (For P16 Controllers, the cooling output is sometimes
referred to as secondary output.) When set to cooling, the output no longer
operates as an alarm but operates as a cooling output. The O2 terminals are the
same as A2, however a separate O2 annunciator indicates Cooling Operation.
Cooling output power ranges from -100% (full cooling) to 0% (no cooling,
unless a heat/cool overlap is used). The Power Limits in Output Module 2-OP
also limit the cooling power. In applications requiring only a Cooling output,
the main 01 output should be used.
CYCLE TIME
???2
2??
This cycle time functions like the O1 Output Cycle Time but allows
independent cycle time for cooling. A setting of zero will keep output O2 off.
RELATIVE GAIN
DEADBAND/OVERLAP
???2
?
This defines the overlap area in which both heating and cooling are active
(negative value) or the deadband area between the bands (positive value). If a
heat/cool overlap is specified, the percent output power is the sum of the heat
power (O1) and the cool power (O2). If Relative Gain is zero, the cooling
output operates in the On/Off Control Mode, with the On/Off Control
Hysteresis ???? in Output Module 2??? becoming the cooling output hysteresis.
The function of Deadband is illustrated in the Control Mode Explanations. For
most applications, set this parameter to 0.0 prior to starting Auto-Tune. After
the completion of Auto-Tune, this parameter may be changed.
???2
1??
??? to 1???
This defines the gain of the cooling relative to the heating. It is generally set
to balance the effects of cooling to that of heating. This is illustrated in the Heat/
Cool Relative Gain Figures. A value of 0.0 places the cooling output into On/
Off Control.
HEAT/COOL RELATIVE GAIN FIGURES
O1
+100%
2X PROPORTIONAL
BAND
O2
-100%
O1
+100%
DEADBAND
NEGATIVE VALUE
RELATIVE GAIN
2 1
.5
O2
-100%
OUTPUT
)
POWER ( %
OUTPUT
)
POWER ( %
HEAT
COOL
TEMPERATURE
RELATIVE GAIN = .5
COOL
TEMPERATURE
SETPOINT
Heat/Cool Deadband = 0
HEAT
SETPOINT
Heat/Cool Deadband < 0
O1
+100%
DEADBAND
POSITIVE VALUE
2
RELATIVE GAIN
1
.5
O2
-100%
OUTPUT
)
POWER ( %
TEMPERATURE
HEAT
SETPOINT
RELATIVE GAIN = .5
COOL
Heat/Cool Deadband > 0
18
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