– 12 –
Setting the valve stroke time
The valve stroke time must be set to use servo control 1 or servo control 2.
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
Adjusting the valve opening position
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
" ("
oPE Ch 1
").
●
MV output flow diagram (MV output priority processing)
7-10
Ramp Soak Function
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.
Creating a ramp soak operation pattern
Set the following items to create a pattern.
The following steps will explain how to run the specified pattern 0 in SV-1 to SV-4.
Running ramp soak
The following steps explain how to run ramp soak.
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.
1
Display the PFB menu ("
PFB [h10
").
2
Display the valve stroke time parameter ("
trvL
") and set the stroke time for the
valve in use.
3
Press the key to set the value.
Point
Auto valve adjustment sets valve stroke time automatically.
For more details on the operation, refer to “7-8 Position Feedback
Control (PFB Control)” (page 12).
1
Display the system menu ("
SYS Ch 7
").
2
Display the control parameter ("
PrCS
") and choose position feedback controls
("
PFb
").
3
Press the key to set the value.
1
Display the PFB menu ("
PFB Ch
10
").
2
Switch to manual control output and fully close the valve.
3
Display "1 (zero adjustment)" in the PFB input adjustment parameter ("
[aL
")
and press the key.
4
Press the key to enter the current input value as "zero".
5
Fully open the valve using manual control.
6
Display "2 (span adjustment)" in the PFB input adjustment parameter ("
[aL
").
7
Press the key to enter the current input value as "span".
Point
To automatically adjust the valve opening, set "
CAL
" to 3 in step 3 above.
This setting will automatically open and close the valve to adjust it auto-
matically.
Caution
•
To manually adjust the valve, carry out step 1 through step 7 as written
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.
Caution
•
MV limit does not apply to the MV output during manual operation, FALT,
or standby.
(Take extra caution when MV performs flash protection during combus-
tion control by using the overlimit function.)
MV
MV1
MV2
MV1
MV2
MV limit
PID
calculation
output
setting
during
FALT
Soft start
limit
Specify
standby
MV output
manual
MV output
parameter
“MAN”
Dual
calculation
OFF
ON
Caution
•
When using the system in the restore mode ("
ConT
") = continue ("
Con
") in
the ramp/soak menu ("
PrG Ch4
"), do not set the ramp/soak control com-
mand ("
PrG
") of the operation menu ("
oPE Ch1
") to hold ("
hLd
") during the
ramp period at the beginning of the pattern.
•
When PV start ("
PVST
") of the ramp/soak menu ("
PrG Ch4
") is on ("
on
"), set
the pattern parameter ("
PTn
") of ramp/soak ("
PrG Ch4
") to "
PTn
" = 0, 2, 6
(setting that starts with 1 seg ramp).
•
Do not set the Startup mode ("
STMd
") = standby mode ("
STbY
") of the sys-
tem menu ("
SYS Ch7
") and the restore mode ("
ConT
") = continue ("
Con
") of
the ramp/soak menu ("
PrG Ch4
") at the same time.
Pattern 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
Target SV Sets the controlled temperature.
Ramp time Sets the time to reach the target SV from the current SV.
Soak time Sets the time to maintain the specified SV.
1
Display the ramp soak menu ("
PrG [h4
").
2
Display pattern parameter ("
PTn
") and choose pattern 0 ("
0
").
Run SV-1 through SV-4.
3
Display the time parameter ("
timU
") and choose minute:second ("
MM.SS
").
Sets the units of time.Besides minute:second ("
MM.SS
"), you can also choose
hour:minute ("
hh.MM
").
4
Display the target value ("
Sv-1
") and set the target temperature.
5
Display the ramp time parameter ("
tm1r
") and set the ramp time.
6
Display the soak time parameter ("
tm1r
") and set the soak time.
7
Repeat steps 4 through 7 and set the remaining parameters.
1
Display the operation menu ("
oPe [h 1
").
2
Display program parameter ("
PrG
") and choose RUN ("
rUn
").
3
Ramp soak starts running from the current PV.
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