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3 7 Heat-Cool Control
3 7 Heat-Cool Control
The Heat-Cool Control can use one of
The Heat-Cool Control can use one of
mode are shown in the following table.
mode are shown in the following table.
Heat
Control Modes
Uses
Heat : ON-OFF
OUT1
Cool : ON-OFF
Heat : ON-OFF
OUT2
Cool : P ( PD )
Heat : ON-OFF
OUT2
Cool : PID
Heat : P ( PD )
OUT1
Cool : ON-OFF
Heat : PID
OUT1
Cool : ON-OFF
Heat : PID
OUT1
Cool : PID
: Don't care
: Don't care
: Adjust to meet process
: Adjust to meet process
requirements
requirements
NOTE :
NOTE :
The ON-OFF control may result excessive overshoot and undershoot problems in the process. The P ( or PD )
The ON-OFF control may result excessive overshoot and undershoot problems in the process. The P ( or PD )
control will result in a deviation process value from the set point. It is recommended to use PID control for the Heat-Cool
control will result in a deviation process value from the set point. It is recommended to use PID control for the Heat-Cool
control to produce a stable and zero offset process value.
control to produce a stable and zero offset process value.
Other Setup Required :
Other Setup Required :
O1TY, CYC1, O2TY, CYC2, A2SP , A2DV
O1TY, CYC1, O2TY, CYC2, A2SP , A2DV
O1TY & O2TY are set in accordance with the types of OUT1 & OUT2 installed. CYC1 & CYC2 are selected according to
O1TY & O2TY are set in accordance with the types of OUT1 & OUT2 installed. CYC1 & CYC2 are selected according to
the output 1 type ( O1TY ) & output 2 type ( O2TY ).
the output 1 type ( O1TY ) & output 2 type ( O2TY ).
Generally, selects 0.5 ~ 2 sec. for CYC1, if SSRD or SSR is used for O1TY; 10 ~ 20 sec. if relay is used for O1TY, and
Generally, selects 0.5 ~ 2 sec. for CYC1, if SSRD or SSR is used for O1TY; 10 ~ 20 sec. if relay is used for O1TY, and
CYC1 is ignored if linear output is used. Similar condition is applied for CYC2 selection.
CYC1 is ignored if linear output is used. Similar condition is applied for CYC2 selection.
If OUT2 is configured for ON-OFF control ( by selecting = AL2 ), the OUT2 acts as alarm output, and the process alarm
If OUT2 is configured for ON-OFF control ( by selecting = AL2 ), the OUT2 acts as alarm output, and the process alarm
as well as deviation alarm ( see section 3-9 & 3-10 ) can be used. Adjust A2SP to change set point if process alarm is
as well as deviation alarm ( see section 3-9 & 3-10 ) can be used. Adjust A2SP to change set point if process alarm is
used, and adjust SP1 ( with preset A2DV ) to change set point if deviation alarm is used.
used, and adjust SP1 ( with preset A2DV ) to change set point if deviation alarm is used.
Examples:
Examples:
Heat PID+Cool ON-OFF :
Heat PID+Cool ON-OFF :
TI1=0,TD1=0, and set appropriate values for O1TY and CYC1.
TI1=0,TD1=0, and set appropriate values for O1TY and CYC1.
Heat PID+Cool PID :
Heat PID+Cool PID :
set OUT1=REVR, OUT2=COOL, CPB=100, DB=-4.0, PB1=0, TI1=0 TD1=0, and set appropriate
set OUT1=REVR, OUT2=COOL, CPB=100, DB=-4.0, PB1=0, TI1=0 TD1=0, and set appropriate
values for O1TY, CYC1, O2TY, CYC2.
values for O1TY, CYC1, O2TY, CYC2.
If you have no idea about a new process, then use
If you have no idea about a new process, then use
SELF to enable the self-tuning program .See section 3-19 for self-tuning description. You can use the
SELF to enable the self-tuning program .See section 3-19 for self-tuning description. You can use the
program for the new process or directly set the appropriate values for PB1, TI1 & TD1 according to the historical records
program for the new process or directly set the appropriate values for PB1, TI1 & TD1 according to the historical records
for the repeated systems. If the control behavior is still inadequate, then use
for the repeated systems. If the control behavior is still inadequate, then use
section 3-21 for manual tuning.
section 3-21 for manual tuning.
6
6
combinations of control modes. Setup of parameters for each control
combinations of control modes. Setup of parameters for each control
Cool
Uses
OUT1 OUT2 O1HY OFST PB1 TI1 TD1 CPB
OUT2
REVR
=AL2
OUT1
DIRT
=AL2
OUT1
DIRT
=AL2
OUT2
REVR
=AL2
OUT2
REVR
=AL2
OUT2
REVR
COOL
Table 3.1 Heat-Cool Control Setup
Table 3.1 Heat-Cool Control Setup
Set OUT1= REVR, OUT2= =AL2, A2FN= PV1.H, A2MD=NORM, A2HY=0.1, PB1=0,
Set OUT1= REVR, OUT2= =AL2, A2FN= PV1.H, A2MD=NORM, A2HY=0.1, PB1=0,
self-tuning
self-tuning
Setup Values
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
program to optimize the PID values by selecting YES for
program to optimize the PID values by selecting YES for
manual tuning
manual tuning
UM25001D
DB
A2FN A2MD A2HY
DE.HI
or
NORM
PV1.H
DE.LO
or
NORM
PV1.L
DE.LO
or
NORM
PV1.L
DE.HI
or
NORM
PV1.H
DE.HI
or
NORM
PV1.H
auto-tuning
auto-tuning
to improve the control. See
to improve the control. See
45
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