3 4 Heat Only Control
3 4 Heat Only Control
Heat Only ON-OFF Control : Select REVR for OUT1, Set PB1 to 0, SP1 is used
to adjust set point value, O1HY is used to adjust dead band for ON-OFF
control, TIME is used to adjust the dwell timer ( enabled by selecting TIMR for
A1FN or A2FN ). The output 1 hysteresis ( O1HY ) is enabled in case of PB1 =
0 . The heat only on-off control function is shown in the following diagram :
Heat Only ON-OFF Control : Select REVR for OUT1, Set PB1 to 0, SP1 is used
to adjust set point value, O1HY is used to adjust dead band for ON-OFF
control, TIME is used to adjust the dwell timer ( enabled by selecting TIMR for
A1FN or A2FN ). The output 1 hysteresis ( O1HY ) is enabled in case of PB1 =
0 . The heat only on-off control function is shown in the following diagram :
SP1+O1HY/2
SP1 O1HY/2
SP1
ON
OFF
OUT1 Action
PV
Dead band = O1HY
Time
Time
The ON-OFF control may introduce excessive process oscillation even if
hysteresis is minimized to the smallest. If ON-OFF control is set ( ie. PB1 = 0 ),
TI1, TD1, CYC1, OFST, CPB and PL1 will be hidden and have no function to the
system. The manual mode, auto-tuning, self-tuning and bumpless transfer will
be disabled too.
Select REVR for OUT1, set TI1 to 0, SP1 is used
to adjust set point value, TIME is used to adjust the dwell timer ( enabled by
selecting TIMR for A1FN or A2FN ). OFST been enabled in case of TI1 = 0
is used to adjust the control offset ( manual reset ). Adjust CYC1 according to
the output 1 type ( O1TY ).Generally, CYC1= 0.5 ~ 2 sec for SSRD and SSR,
CYC1=10 ~ 20 sec for relay output .CYC1 is ignored if linear output is selected
for O1TY.
if PB1 is not equal to 0.
OFST is measured by % with range 0 - 100.0 %. In the steady
state ( ie. process has been stabilized ) if the process value is lower than the
set point a definite value, say 5 C, while 20 C is used for PB1, that is lower 25
%, then increase OFST 25 %, and vice versa. After adjusting OFST value, the
process value will be varied and eventually, coincide with set point.
Using the P control ( TI1 set to 0 ), the auto-tuning and self-tuning are disabled.
Refer to section 3-20 " manual tuning " for the adjustment of PB1 and TD1.
Manual reset ( adjust OFST ) is not practical because the load may change
from time to time and often need to adjust OFST repeatedly. The PID control
can avoid this situation.
Selecting REVR for OUT1, SP1 is used to adjust set
point value. TIME is used to adjust the dwell timer ( enabled by selecting
TIMR for A1FN or A2FN ). PB1 and TI1 should not be zero. Adjust CYC1
according to the output 1 type ( O1TY ). Generally, CYC1 = 0.5 ~ 2 sec for
SSRD and SSR, CYC1 = 10 ~ 20 sec for relay output. CYC1 is ignored if
linear output is selected for O1TY.
In most cases the self-tuning can be used to substitute the auto-tuning. See
If self-tuning is not used ( select NONE for SELF ), then use
auto-tuning for the new process, or set PB1, TI1 and TD1 with historical values.
See
for auto-tuning operation. If the control result is still
unsatisfactory, then use manual tuning to improve the control . See
for manual tuning. BTC-9300 contains a
algorithm to achieve a
to the
process if it is properly tuned.
Heat only P ( or PD ) control :
O1HY is hidden
OFST Function :
Heat only PID control :
Section 3-18.
Section 3-19
Section
3-20
very clever PID and Fuzzy
very small overshoot and very quick response
The ON-OFF control may introduce excessive process oscillation even if
hysteresis is minimized to the smallest. If ON-OFF control is set ( ie. PB1 = 0 ),
TI1, TD1, CYC1, OFST, CPB and PL1 will be hidden and have no function to the
system. The manual mode, auto-tuning, self-tuning and bumpless transfer will
be disabled too.
Select REVR for OUT1, set TI1 to 0, SP1 is used
to adjust set point value, TIME is used to adjust the dwell timer ( enabled by
selecting TIMR for A1FN or A2FN ). OFST been enabled in case of TI1 = 0
is used to adjust the control offset ( manual reset ). Adjust CYC1 according to
the output 1 type ( O1TY ).Generally, CYC1= 0.5 ~ 2 sec for SSRD and SSR,
CYC1=10 ~ 20 sec for relay output .CYC1 is ignored if linear output is selected
for O1TY.
if PB1 is not equal to 0.
OFST is measured by % with range 0 - 100.0 %. In the steady
state ( ie. process has been stabilized ) if the process value is lower than the
set point a definite value, say 5 C, while 20 C is used for PB1, that is lower 25
%, then increase OFST 25 %, and vice versa. After adjusting OFST value, the
process value will be varied and eventually, coincide with set point.
Using the P control ( TI1 set to 0 ), the auto-tuning and self-tuning are disabled.
Refer to section 3-20 " manual tuning " for the adjustment of PB1 and TD1.
Manual reset ( adjust OFST ) is not practical because the load may change
from time to time and often need to adjust OFST repeatedly. The PID control
can avoid this situation.
Selecting REVR for OUT1, SP1 is used to adjust set
point value. TIME is used to adjust the dwell timer ( enabled by selecting
TIMR for A1FN or A2FN ). PB1 and TI1 should not be zero. Adjust CYC1
according to the output 1 type ( O1TY ). Generally, CYC1 = 0.5 ~ 2 sec for
SSRD and SSR, CYC1 = 10 ~ 20 sec for relay output. CYC1 is ignored if
linear output is selected for O1TY.
In most cases the self-tuning can be used to substitute the auto-tuning. See
If self-tuning is not used ( select NONE for SELF ), then use
auto-tuning for the new process, or set PB1, TI1 and TD1 with historical values.
See
for auto-tuning operation. If the control result is still
unsatisfactory, then use manual tuning to improve the control . See
for manual tuning. BTC-9300 contains a
algorithm to achieve a
to the
process if it is properly tuned.
Heat only P ( or PD ) control :
O1HY is hidden
OFST Function :
Heat only PID control :
Section 3-18.
Section 3-19
Section
3-20
very clever PID and Fuzzy
very small overshoot and very quick response
Figure 3.2 Heat Only
ON-OFF Control
Figure 3.2 Heat Only
ON-OFF Control
Setup ON-OFF :
Adjust :
OUT1 =
PB1 = 0
SP1, O1HY, TIME( if enabled)
Setup ON-OFF :
Adjust :
OUT1 =
PB1 = 0
SP1, O1HY, TIME( if enabled)
Setup P:
OUT1 =
TI1 = 0
CYC1 ( if RELAY, SSRD or SSR is
selected for O1TY )
Setup P:
OUT1 =
TI1 = 0
CYC1 ( if RELAY, SSRD or SSR is
selected for O1TY )
Adjust :
SP1, OFST, TIME ( if enabled ),
PB1 ( = 0 ), TD1
Adjust :
SP1, OFST, TIME ( if enabled ),
PB1 ( = 0 ), TD1
Setup PID :
Adjust:
OUT1 =
O1TY
CYC1 ( if RELAY, SSRD or SSR is
selected for O1TY )
SELF = NONE or YES
SP1, TIME ( if enabled ), PB1 ( = 0 ),
TI1 ( = 0 ), Td1.
Setup PID :
Adjust:
OUT1 =
O1TY
CYC1 ( if RELAY, SSRD or SSR is
selected for O1TY )
SELF = NONE or YES
SP1, TIME ( if enabled ), PB1 ( = 0 ),
TI1 ( = 0 ), Td1.
Auto-tuning:
Used for new process. during initial
tuning
Auto-tuning:
Used for new process. during initial
tuning
Self-tuning:
Used for a process any time.
Self-tuning:
Used for a process any time.
Manual Tuning:
May be used if self-tuning and
auto-tuning are inadequate.
Manual Tuning:
May be used if self-tuning and
auto-tuning are inadequate.
UM93001C
43