Extech VFL Operating Manual
INSTRUCTION MANUAL VFL Series PID Controllers
■FRONT PANEL DESCRIPTION：
(1) PV－Process Value
(2) SV－Setting Value
(3) AT－Auto tuning LED
(4) MA－Manual mode LED
(5) A1－Alarm 1 LED
(6) A2－Alarm 2 LED
(7) C1－Control 1 LED
(8) C2－Control 2 LED
(1)
Press and hold this key for 5 seconds to reset alarm timer.
(2)
(3)
(4)
To abort an Auto Tune process, press and hold the shift key for 5 seconds.
(5)
(6)
(7)
－
SET KEY. Press once to access the next programmabl e parameter.
－UP KEY. Press to increase the set point or paramet er value.
－DOWN KEY. Press to decrease the set point or parame ter value.
－SHIFT KEY. Press the shift key for 5 seconds to execute Auto Tune process (Yes. 1 mode)
－
Press the SET and UP keys once to return the normal operation.
－LEVEL KEY. Press the SET & SHIFT keys simultaneously for 5 seconds to select programming
level, then press the SET key to enter this level.
---Press the UP & DOWN keys simultaneously for 5 seconds to access “LnLo” & “LnHi” parameters.
■PANEL CUTOUT：
Model A B C D E a b c d
48VFL 48 48 6 100 45 45+0.5 45+0.5 60 48
96VFL 96 96 10 80 91 92+0.5 92+0.5 120 96
(Units: mm)
■ WIRING DIAGRAM
■Wiring Precautions:
1. Before wiring, verify the controller label for correct model number and options.
2. For thermocouple input, use the appropriate compensation wire. And note the polarity of input signal.
3. To avoid noise induction, keep input signal wires away from instrument power lines, load lines and power lines of
other electrical equipment.
■ PROGRAMMING LEVEL PARAMETERS
■
lst. Prog. Level 2nd. Prog. Level 3rd. Prog. Level 4th Prog. Level 5th. Prog. Level
+
1. When 2nd Output (Cooling) is not selected, CPb、Cti、
Ctd、HYS2 and db parameters are not available.
2. When Pb≠0.0， HYS1 will be skipped.
3. When CPb≠0.0，HYS2 will be skipped.
4. When Pb＝0.0，ti、td will be skipped.
5. When CPb＝0.0，Cti、Ctd will be skipped.
■PARAMETER DESCRIPTION：
LEVEL Selection
Press
key to select programming level. Then press key to enter this level.
LEVEL
USER LEVEL
CODE DESCRIPTION RANGE Default
Set point value of control
Alarm 1 set point value/Timer set value while A1FU is set to
T.on or T. off, the unit can be HH.MM or MM.SS. It depends on
the “P.tnE” parameter.
Alarm 2 set point value/ Timer set value while A2FU is set to
T.on or T. off, the unit can be HH.MM or MM.SS. It depends on
the “P.tnE” parameter.
：Auto-tuning is disable
Autotune PV is compared wit SV during auto tuning.
：Standard type auto-tuning.
：Low PV type auto-tuning.
keys for at least 5 seconds to access Soft Level. Use or
Description
SoFt Level
PID Level
Option Level
LoLt － HiLt
-1999 － 9999/
00.00~99.59
-1999 － 9999/
00.00~99.59
500
10
10
no
PV is compared with SV-10%FS during Auto-tuning.
Output percentage. Adjustable when “Hand” is set to “Yes”
：Disable the manual mode Manual control
：Enable the manual mode.
-100.0
－ 100.0
no
0.0
SOFT LEVEL
Code Description Range Default
Ramp rate for the process value to limit an a brupt C hange
of process (℃/min)
Set point value of soft-start
Output percentage of soft-start
0 - 9999
（0.0 –
999.9）
LoLt － HiLt ０
0.0 - 100.0 100.0
0.0
PID LEVEL
CODE DESCRIPTION RANGE Default
Proportional band variable. Set to 0.0 for ON/OFF control mode
Integral time (Reset). This value is automatically calculated by
activating the Autotune function. If desired, the user can later
adjust this parameter to better suit the application. When PB=0.0,
this parameter will be not available. When set to zero, Pb & td ≠ 0
0.0-300.0% 10.0
0-3600sec 240
for PD control
Derivative (Rate). This value is automatically calculated by
activating the Auto tune function. If desired, the user can later
adjust this parameter to better suit the application. When PB=0.0,
this parameter will be not available. When set to zero, Pb & td ≠ 0
for PI control
Proportional cycle time of output 1
Proportional band variable for secondary control output (cooling).
Set 0.0 for ON/OFF
Integral time for secondary control output. When PB=0.0, this
parameter will be not available. When set to zero, Pb & td ≠ 0 for
PD control
Derivative time for secondary control output. When Pb=0.0, this
parameter will be not available. When set to zero, P b & ti ≠ 0for
PI control
Proportional cycle time of output 2
Hysteresis for ON/OFF control on output 1
Hysteresis for ON/OFF control on output 2
Hysteresis of alarm 1
Hysteresis of alarm 2
Dead band value. This defines the area in which output 1 and
output 2 are both active (negative value) or the area in which
output 1 and output 2 are both inactive (positive value)
0-900sec 60
0-100sec 15
0.0-300.0% 10.0
0-3600sec 240
0-900sec 60
0-100sec 15
0-2000(0.0-200.0) 1
0-2000(0.0-200.0) 1
0-2000 1
0-2000 1
-1000-1000
0
(-100.0-100.0)
Set point offset. This value will be added to SV to perform control.
-1000-1000 0
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