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Setting the valve stroke time
The valve stroke time must be set to use servo control 1 or servo control 2.
Display the PFB menu ("
PFB [h10
1
Display the valve stroke time parameter ("
2
valve in use.
Press the
key to set the value.
3
Auto valve adjustment sets valve stroke time automatically.
Point
For more details on the operation, refer to "7-8 Position Feedback
Control (PFB Control)" (page 12).
7-8
Position Feedback Control (PFB Control)
PFB control uses the opening position signal from the valve in its MV output calculation for the
controller, but is otherwise a similar function to "7-7 Valve Controls (Servo Control 1 / Servo
Control 2)".
Unlike the servo controls, which use estimated controls for the valve position, PFB controls
allow detailed control.
Setting position feedback control
Display the system menu ("
SYS Ch 7
1
Display the control parameter ("
2
("
PFb
").
Press the
key to set the value.
3
Adjusting the valve opening position
Display the PFB menu ("
PFB Ch 10
1
Switch to manual control output and fully close the valve.
2
Display "1 (zero adjustment)" in the PFB input adjustment parameter ("
3
and press the
key.
Press the
key to enter the current input value as "zero".
4
Fully open the valve using manual control.
5
Display "2 (span adjustment)" in the PFB input adjustment parameter ("
6
Press the
key to enter the current input value as "span".
7
To automatically adjust the valve opening, set "
Point
This setting will automatically open and close the valve to adjust it auto-
matically.
•
To manually adjust the valve, carry out step 1 through step 7 as written
Caution
above.
•
If the valve is not connected or connected incorrectly, it can still be
adjusted, but will not achieve accurate results.
•
There is no open-circuit judgment function for the valve opening feed-
back signal.
7-9
Manual Output
Allows the control output to be manually set at an arbitrary value.
●
Manual Mode Display
A decimal point will light up at the bottom right of the display during manual mode.
The same decimal point appears on the parameter setting display.
●
Switchover between Auto and Manual
Modes can be changed by four methods: the front key (user key), DI function, communica-
tion function, or the parameter "
MAn
●
MV output flow diagram (MV output priority processing)
MV1
MV
PID
Dual
MV limit
calculation
calculation
MV2
•
MV limit does not apply to the MV output during manual operation, FALT,
Caution
or standby.
(Take extra caution when MV performs flash protection during combus-
tion control by using the overlimit function.)
").
trvL
") and set the stroke time for the
").
PrCS
") and choose position feedback controls
").
CAL
" to 3 in step 3 above.
" ("
oPE Ch 1
").
output
Specify
Soft start
setting
standby
limit
during
MV output
FALT
manual
MV output
parameter
"MAN"
7-10
Automatically runs after setting the times for the SV changes.
You can choose up to sixteen steps for the SV setting and seven types of ramp soak operation
patterns.
SV
step1
SV-1
PV
TM1r
Caution
Creating a ramp soak operation pattern
Set the following items to create a pattern.
Pattern
Target SV
Ramp time
Soak time
The following steps will explain how to run the specified pattern 0 in SV-1 to SV-4.
Display the ramp soak menu ("
1
[aL
")
Display pattern parameter ("
2
Run SV-1 through SV-4.
Display the time parameter ("
3
Sets the units of time.Besides minute:second ("
hour:minute ("
Display the target value ("
4
[aL
").
Display the ramp time parameter ("
5
Display the soak time parameter ("
6
Repeat steps 4 through 7 and set the remaining parameters.
7
Running ramp soak
The following steps explain how to run ramp soak.
Display the operation menu ("
1
Display program parameter ("
2
Ramp soak starts running from the current PV.
3
Point
Guaranty soak
This function guarantees the soak time. Only soak time within the specified range of tempera-
ture for SV is counted towards soak time.
As seen in the figure below, only the sum of the shaded areas is counted as soak time. The
operation moves onto the next step when the total soak time equals the specified soak time.
OFF
MV1
MV2
ON
– 12 –
Ramp Soak Function
SV-8
step2
step3
SV-7
SV-3
SV-4
SV-2
SV-5
SV-6
TM1s
TM5s
• • • •
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
TM5r
step1 to 4: pattern0
step5 to 8: pattern1
step1 to 8: pattern2
step1 to 16: pattern6
•
When using the system in the restore mode ("
the ramp/soak menu ("
PrG Ch4
mand ("
PrG
") of the operation menu ("
ramp period at the beginning of the pattern.
•
When PV start ("
PVST
") of the ramp/soak menu ("
the pattern parameter ("
PTn
") of ramp/soak ("
(setting that starts with 1 seg ramp).
Do not set the Startup mode ("
STMd
•
tem menu ("
SYS Ch7
") and the restore mode ("
the ramp/soak menu ("
PrG Ch4
") at the same time.
Sets which steps to use from the following seven types.
Steps 1 to 4 / Steps 5 to 8 / Steps 9 to 12 / Steps 13 to 16 / Steps 1 to 8 / Steps 9
to 16 / Steps 1 to 16
Sets the controlled temperature.
Sets the time to reach the target SV from the current SV.
Sets the time to maintain the specified SV.
PrG [h4
PTn
") and choose pattern 0 ("
timU
") and choose minute:second ("
hh. M M
").
Sv-1
") and set the target temperature.
tm1r
tm1r
oPe [h 1
PrG
") and choose RUN ("
•
To interrupt the ramp soak operation, choose HOLD ("hLD") in step 2. To
cancel the interruption, choose RUN ("rUn") again.
•
"End" will display when ramp soak has completed.
soak time=T1+T2+T3
process value
guaranty soak
range upper limit
guaranty soak
range lower limit
SV
SV-9
SV-13
SV-12
SV-10
SV-14
SV-11
SV-15
SV-16
TM16r
step9 to 12: pattern3
step13 to 16: pattern4
step9 to 12: pattern5
ConT
") = continue ("
Con
"), do not set the ramp/soak control com-
oPE Ch1
") to hold ("
hLd
") during the
PrG Ch4
") is on ("
on
"), set
PrG Ch4
") to "
PTn
" = 0, 2, 6
") = standby mode ("
STbY
") of the sys-
ConT
") = continue ("
Con
").
0
").
MM. S S
").
MM. S S
"), you can also choose
") and set the ramp time.
") and set the soak time.
").
rUn
").
T1
T2
T3
PV
t
time
TM16s
") in
") of
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