i-therm AI-7482 Operation instructions

i
(48 X 48)
AI-7482 AI-7782
(72 X 72)
AI-7982
(96 X 96)
AI-7882
(48 X 96)
1. DISPLAY TYPE : Dual 4- Digit 7 Segment LED
4 Digit Bright White (PV)
4 Digit Luminous Green (SV)
STATUS LED’S : OP 1 : Main Control Output
OP 2 : Alarm Status
SOAK : Soak Timer
TUNE : Tuning Status (Only AI-7982)
2. INPUT
Sensor input : TC:J,K,R,S,N,T,B & RTD: Pt-100
Range : Refer below table.
Sampling Time : 125 msec.
Resolution : 1°C/0.1°C(Only for RTD)
CJC for TC : Built in automatic
LWC for Pt-100 : Built in upto 18E max.
Digital Filter : 1 to 10 Sec.
3. RELAY OUTPUT
Contact type : N/O, CM, N/C
Contact Rating : 5A @ 250VAC or 30 VDC
Life expectancy : > 5,00,000 operations
Isolation : Inherent
4. SSR DRIVE OUTPUT
Drive Capacity : 12V @ 30mA.
Isolation : Non-Isolated.
5. FUNCTION
Output 1 : Main Control output
Output 2 : Programmable
1) Auxiliary control
2) Alarm
3) Soak timer
4) Alarm + Soak timer
Control Action : ON-OFF/PID (Select)
Control Mode : Heat/Cool (Select)
Compliance : ----
6. ENVIRONMENTAL
Operating Range : 0 ~50°C, 5~90% Rh
Storage Humidity : 95% Rh (Non-condensing)
7. POWER SUPPLY
Supply Voltage : 90~270VAC, 50/60Hz.
Consumption : 4W Maximum.
8. PHYSICAL
Housing : ABS Plastic
USER’S OPERATING MANUAL FOR PID DIGITAL TEMPERATURE CONTROLLER
(Models: AI 7482 / 7882 / 7782 / 7982 / 7682)
SPECIFICATIONS : - SAFETY INSTRUCTION :
This controller is meant for temperature control
applications. It is important to read the manual prior to
installing or commissioning of controller. All safety
related instruction appearing in this manual must be
followed to ensure safety of the operating personnel as
well as the instrument.
GENERAL
vThe controller must be configured correctly for intended
operation. Incorrect configuration could result in
damage to the equipment or the process under control
or it may lead personnel injury.
vThe controller is generally part of control panel and in
such a case the terminals should not remain accessible
to the user after installation.
MECHANICAL
vThe Controller in its installed state must not come in
close proximity to any corrosive/combustible gases,
caustic vapours, oils, steam or any other process by-
products.
vThe Controller in its installed state should not be
exposed to carbon dust, salt air, direct sunlight or
radiant heat.
vAmbient temperature and relative humidity surrounding
the controller must not exceed the maximum specified
limit for proper operation of the controller.
vThe controller in its installed state must be protected
against excessive electrostatic or electromagnetic
interferences. Ventilation holes provided on the chassis
of the instrument are meant for thermal dissipation
hence should not be obstructed in the panel.
ELECTRICAL
vThe controller must be wired as per wiring diagram & it
must comply with local electrical regulation.
vCare must be taken not to connect AC supplies to low
voltage sensor input.
vCircuit breaker or mains s/w with fuse (275V/1A) must
be installed between power supply and supply terminals
to protect the controller from any possible damage due
to high voltage surges of extended duration.
vCircuit breaker and appropriate fuses must be used for
driving high voltage loads to protect the controller from
any possible damage due to short circuit on loads.
vTo minimize pickup of electrical noise, the wiring for low
voltage DC and sensor input must be routed away from
high current power cables. Where it is impractical to do
this, use shielded ground at both ends.
vThe controller should not be wired to a 3-Phase supply
with unearthed star connection. Under fault condition
such supply could rise above 264 VAC which will damage
the controller.
vThe Electrical noise generated by switching inductive
loads might create momentary Fluctuation in display,
alarm latch up, data loss or permanent damage to the
instrument. To reduce this use snubber circuit across
the load.
v It is essential to install a over Temp. Protection device
to avoid any failure of heating system. Apart from
spoiling the product, this could damage the process
being controlled.
1OIM AI-7X82 V2.0 Page 1 of 9
Model no.
Display height (PV)
Display height (SV)
AI-7482
0.36” 0.56” 0.80” 0.36” 0.36”
0.36”0.36”0.24” 0.39” 0.56”
AI-7882AI-7782 AI-7982 AI-7682
AI-7682
(96 X 48)
Fe-k(J) T/C
Cr-AL(K) T/C
Sensor Type Accuracy
o
± 1 C
o
0 ~ 1700 C
o
0 ~ 1700 C
o
0 ~ 1800 C
o
-100 ~ 450 C
Resolution
Range
o
1 C
o
1 C
o
1 C
}
(R) T/C
(S) T/C
TC - N
TC - T
TC - B
Pt-100(RTD)
Pt-100(RTD 0.1)
o
0 ~ 760 C
o
-99 ~ 1300 C
o
-99 ~ 1300 C
o
-99 ~ 400 C
o
-99.9 ~ 450.0 C
o
1 C
o
1 C
o
1 C
o
1 C
o
1 C
o
0.1 C
o
± 0.3 C

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OVER ALL DIMENSIONS & PANEL CUT OUT (IN MM)
MECHANICAL INSTALLATION
The label on the controller identifies the serial number, wiring connections and batch number.
INSTALLATION GUIDELINES :
1. Prepare the cut-out with proper dimension as shown in figure.
2. Remove clamp from controller
3. Push the controller through panel cut-out and secure the
controller in its place by tightening the side clamp.
C H
MODEL : AI - 7682
E
D
CH
A
B
F
G
PANEL
CUTOUT
CAUTION: To prevent the risk of electrical shock, switch off the power before making/removing any connection or removing
the controller from its enclosure.
ELECTRICAL INSTALLATION
The electrical connection diagram is shown on the controller enclosure as below.
A
B D
CH
E
G
F
MODEL:-AI-7482/7782/7982
PANEL
CUTOUT
MODEL : AI - 7882
B
AE
DG
F
PANEL
CUTOUT
AI-7782 AI - 7982AI-7482
SSR2
NC NOCM
RELAY2
SUPPLY
LN
12345
678 9 10
11
13
14
15
16
12
NO NCCM
RELAY1
SSR1
SUPPLY
L
N
123456
78910 11 12
15
16
13
14
NO NCCM
RELAY2
NO NCCM
RELAY1
SSR2
SSR1
SSR2
123456789
10 11 12 13 14 15 16 17 18
NO NCCM
RELAY1
SSR1
NO NCCM
RELAY2
LN
SUPPLY
SSR2SSR1
123456789
10 11 12 13 14 15 16 17 18
NO NCCM
RELAY1
NO NCCM
RELAY2
LN
SUPPLY
AI - 7682/7882
2OIM AI-7X82 V2.0 Page 2 of 9
TABLE : 1
Model
Dim
48
72
96
96
48
48
72
96
48
96
8
10
10
10
10
75
65
45
45
45
44
68
92
44
92
44
68
92
92
44
9
9
9
9
9
A B HC D F GE
43
66
89
89
43
AI-7482
AI-7782
AI-7982
AI-7682
AI-7882
AI - 7482 AI - 7782 AI - 7982
FRONT PANEL LAYOUT
AI - 7882
AI - 7682
Glows when OP1 is ON & flashes when delay time (dly1) is in operation(if selected mode is ON-OFF)
Glows when OP2 is ON & flashes when alarm condition persists even after
acknowledged OR delay time (dly2) is in operation & selected mode is ON-OFF.
Glows when Soak mode is selected & flashes when Soak timer is in operation.
( ( (
along with UP key. (4) To scroll the parameter & to store its value.
1) For SP programming. 2) To access Control mode. 3) To access Configuration mode
( (
(with SET key) . (3) To acknowledge Alarm. (4) To enter in tune mode (with DOWN Key).
1) To increase/alter parameter value in program mode. 2) To Enter in configuration mode
( ( To enter in tune mode (with
UP Key).
1) To decrease / alter parameter value in program mode. 2)
It will display (1) Measured value of selected input or Error massages in run mode.
(2) Parameters Value in program mode.
It will display (1) (Main s ) / SP2 (Auxiliary/Alarm) set value / Set Soak time
value/ balance or elapsed soak time in run mode. (2) Parameter code in program mode.
SP et point
1
2
3
4
5
6
7
OP1 LED
OP2 LED
SOAK LED
UPPER
DISPLAY
LOWER
DISPLAY
SET
KEY
SHIFT
KEY
Sr. NAME FUNCTION
UP
KEY
DOWN
KEY
(1) To increase/alter parameter value in program mode with Up / Dn Key.
(2) Press for 3Sec in Programming this will help to go back to previous parameter.
FRONT PANEL LAYOUT DESCRIPTION :
4
5
6
7
12
3
AI-7482
OP1
OP2
SOAK
PV
SV
SET AT RESET START
6
7
4
5
12
3
OP1
OP2
SOAK
PV
SV
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AI-7782
SET AT RESET START
6
7
4
5
1
2
3
OP1 OP2 SOAK
PV
SV
TUNE
SET AT RESET START
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AI-7982
1
2
4
3
6
7
5
PV
SV
AI-7882
OP1
OP2
SOAK
SET START
AT RESET
1
5
3
2
6
47
SET START
AT RESET
PV
SV
AI-7682
OP2 SOAKOP1

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POWER UP: At power on, following sequence will be prompted on the display till it reaches to Home display mode.
In home display mode, by pressing DOWN key, User can
view the set value of SP1 & SP2 (if OP2 = AUXILIARY or
ALARM mode) or timer value(if OP2 = soak mode)
sequentially.
Here, Lower display will show SP1-value, SP2-value,
Alarm SP-Value & Timer-value by pressing DOWN key and
it’s respective parameter code (SP1/SP2/AL.SP/SOAK
TIME) by pressing UP key.
UPPER
DISPLAY
LOWER
DISPLAY
MODEL VERSION HOME
PV
SV
PROGRAMMING
USER LIST : To access the user list press SET key once.
100 %
OUTPUT
POWER
LIMIT
0.0 %
TO
100.0 %
This parameter will be prompted only if selected control action is PID.
This parameter will decide the maximum output power in % applied to
the load.
CYCLE
TIME
0.5
to
100.0 Sec.
This parameter will be prompted only if selected control action is PID.
User can set this value based on process being controlled & type of
output being selected. For Relay O/P, cycle time should be more than
12sec & for SSR O/P, cycle time should be less than 10sec.
16.0 Sec.
DERIVATIVE
TIME
0
to
300 Sec.
This parameter will be prompted only if selected control action is PID. It
defines how strongly the controller will react to rate of change of PV.
Value of this parameter is automatically set by auto tune function. If set
to ‘0’, this function will be disabled.
60
INTEGRAL
TIME
0
to
9999 Sec.
This parameter will be prompted only if selected control action is PID. It
sets the time taken by PID algorithm to remove steady state error. Value
of this parameter is automatically set by auto tune function. If set to ‘0’,
this function will be disabled.
240
PROPORTIONAL
BAND
0.5
to
99.9°C
This parameter will be prompted only if selected control action is PID. It
sets proportional band over which the output power is adjusted
depending upon the error (SV-PV). Value of this parameter is
automatically set by Auto tune function.
o
5.0 C
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER
RANGE
DESCRIPTION DEFAULT
CONTROL LIST : SET & DOWN key simultaneously To enter in this mode, press for 3 sec. User can then set the
following control parameters.
OUTPUT
OFF
1 to10 This parameter will be prompted only if selected control action is PID.
With this parameter O/P will be Completely OFF after the Set Point +
Offset Value. If Disable, O/P will act Depending upon the PID Value
after Set Point achieved.
Disable
3OIM AI-7X82 V2.0 Page 3 of 9
This parameter is prompted only if output 2 is configured as soak timer.
Controller starts the execution of soak time as per the mode selected.
Soak timer can be programmed using four different time base in Config.
List.
This parameter is prompted if SP2 is Enable & output 2 is configured as
(1) Either absolute auxiliary control or as an alarm (High/Low) mode.
(2) Either deviation auxiliary control or as a deviation alarm mode.
(3) As a band alarm(For all above Sp2 has to be enable).
SOAK
TIME
1 Sec to
999.9 Hrs. 1 min.
LSPL ~ HSPL
-99 to +99°C
2 t o 9 9 ° C
SET
POINT 2
o
0 C
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER
RANGE
DESCRIPTION DEFAULT
CONTROL
SET POINT
LSPL ~ HSPL
----------
o
0 C
User can change SP1 value using UP/ DOWN keys. Holding the key,
will change the value at a faster rate. Press SET key to store the
desired value & move on to the next parameter.
This parameter will be available only if Enabled in Configuration List.
User can set ramp rate/min for SP1 (Set Point) to minimize overshoot.
RAMP
RATE
o
0.0 C
to
o
25.0 C
Disable
This parameter is prompted only if Control Logic for Output1 is
configured for Heat-Cool.
O/p2 will be automatically activated /de-activated w.r.t SP1 & HYS.
OP2
MODE AUTO
O/p2 will be permanently Activated (ON).
O/p2 will be permanently De-Activated (OFF).
0
Set this parameter to 15 (Default LOCK CODE) to access Control List.
User has a choice to set different Lock Code via USER LOCK CODE in
Config. List.
1 ~ 9999
LOCK
CODE

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0
to
500 Sec.
0 Sec.
DELAY 2
HYS 2 o
1 to 25 C o
2 C
CONTROL
HYS
o
1 to 25 C 2°C
TUNE
OFFSET
50 %
to
100 %
100 %
DELAY 1
0
to
500 Sec.
120 Sec.
This parameter will be prompted only if selected control action is ON -
OFF. It sets the dead band between ON & OFF switching of the Output.
Larger value of hysterisis minimize the number of ON-OFF operation to
the load. This increases life of actuators like contactors but, also
produces large errors (between PV & SV).
-9.9
to
9.9°C
0 °C
GAP 1
-9.9
to
9.9°C
0 °C
GAP 2
0
to
99 Sec.
10 Sec.
SOAK
TIME
DELAY
0.0
to
99°C.
This parameter will be prompted only if selected control action is ON -
OFF. It sets the main output Delay time where O/P once turned OFF will
turn ON only after Delay time, regardless difference between PV & SP.
Also, Delay will be considered at every power ON.
This parameter will be prompted only if Control Logic for Output1 is
configured for Heat-Cool.
SP (set point) will be consider as (SP-Gap1) for heating.
This parameter will be prompted only if selected control mode for
output2 is Auxiliary control or an Alarm. The value of this parameter sets
the dead band between ON & OFF switching of output load.
This parameter will be prompted only if Control Logic for Output1 is
configured for Heat-Cool.
SP (set point) will be consider as (SP+Gap2) for cooling.
This parameter will be prompted only if Output2 is configured as an
Auxiliary control output OR Control Logic is configured for Heat-Cool. In
this mode, it sets the output Delay time where O/P once turned OFF will
turn ON only after Delay time, regardless difference between PV &
SP2. Also, Delay will be considered at every power ON.
This parameter will be prompted only if selected control mode for
Output2 is Soak timer. Depending on end of soak strategy, the value of
this parameter sets the activation time for OP2 when Soak timer is over.
Setting this parameter to ‘0’ will make OP2 continuously ON at the end
of Soak time till User starts the next cycle.
This parameter defines the permissible deviation of PV from SP during
soak time cycle. If PV falls outside the Soak band during soak cycle,
Timer halts. Timer will start only when PV falls within the soak band.
This parameter is ignored if set to ‘0’.
0 Sec.
SOAK
BAND
CONFIGURATION LIST : (1) key simultaneously To enter in this mode, press and hold SET & UP for 3 sec.
(2) Press UP or DOWN key to scroll between parameter options.
(3) Press SET key to store current parameter & move on to the next parameter.
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER
RANGE
DESCRIPTION DEFAULT
This parameter will be prompted only if selected control action is PID.
This parameter allows the User to carry out Auto Tuning function below
the set point. (If tune offset is set to 50 %, tuning will be carried out at
50 % of the set point and if set to 100 %, tuning will be carried out at
100 % of the set point.)
4OIM AI-7X82 V2.0 Page 4 of 9
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DESCRIPTION DEFAULT
Set this parameter to 15 (Default LOCK CODE) to access Config. List.
User have a choice to set different Lock Code via USER LOCK CODE in Config.
List.
LOCK
CODE 0
Fe-k(J) T/C
Cr-AL(K) T/C
o
0 ~ 760 C
o
-99 ~ 1300 C
o
-99 ~ 1300 C
o
-99 ~ 400 C
o
1 C
o
1 C
o
1 C
}
(R) T/C
(S) T/C
TC - N
TC - T
o
0 ~ 1700 C
o
0 ~ 1700 C
o
1 C
o
1 C
o
1 C
Sensor Type Accuracy
Resolution
Range
1
±oC
TC - J
INPUT
TYPE
This parameter value is set according to the type of sensor (Thermocouple or RTD
input) connected to the controller's input terminals.

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5OIM AI-7X82 V2.0 Page 5 of 9
AUTO
TUNE
Enable
This parameter will be prompted only if selected control action is PID.
If Enabled, this parameter will be prompted if user press Up & Down keys
Simultaneously for 3Sec.
If Disabled, this parameter will not be prompted if user press Up & Down keys
Simultaneously for 3Sec.
LOWER
SET
POINT
LIMIT
o
0 C
Sets the minimum limit for set point adjustment. It can be set from minimum
specified range of selected sensor to HSPL value.
HIGHER
SET
POINT
LIMIT
o
400 C
Sets the maximum limit for set point adjustment. It can be set from LSPL value to
maximum specified range of selected sensor.
PROCESS
VALUE
OFFSET
o
0 C
Function of this parameter is to add/subtract a constant value to the measured PV
to obtain Final PV for control applications. This parameter value needs to be
altered for one of the following reason : -
(i) To compensate for known thermal gradient.
(ii)To match the display values with another recorder or indicator measuring the
same PV.
INPUT
FILTER 1
The controller is equipped with an adaptive digital filter which is used to filter out
any extraneous pulses on the PV. The filtered PV Value is used for all PV
dependent functions. If the PV signal is fluctuating due to noise, increase the filter
time constant value.
CONTROL
MODE
FOR O/P 1
PID
User can select between PID or ON-OFF action algorithm to be adopted for
output.
HEAT
CONTROL
LOGIC
FOR O/P 1
User can select heating logic in which OP1 will remain ON till PV < SP.
(PV increases when output is ON.)
User can select cooling logic in which OP1 will remain ON till PV > SP.
(PV decreases when output is ON.)
This parameter will be prompted only if selected input is RTD or RTD.1 and is
used for BOD application. Here OP1 acts as Heating control & OP2 as Cooling
control.
OVERSHOOT
CONTROL
POINT
Disable
This parameter will be prompted only if selected control action is PID. Setting this
parameter on higher side will proportionally slows down the rate of rise of PV to
minimize overshoot (this may cause delay to reach SP). Setting on lower side will
proportionally or disabling this parameter will increase the rate of rise of PV
(which may cause overshoot). Disable this option if delay is not required to reach
SP.
RAMP
RATE
Disable
This parameter will be prompted only if OCP (over shoot control point) is disabled.
When enabled, User can set the desired RAMP rate in USER list.
When disabled, this parameter will not be prompted in USER list.
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DESCRIPTION DEFAULT
INPUT
TYPE
This parameter value is set according to the type of sensor (Thermocouple or RTD
input) connected to the controller's input terminals.
o
0.3 C
±
Pt-100(RTD 0.1)
o
-100.0 ~ 450.0 C
o
0.1 C
Pt-100(RTD) o
-100 ~ 450 C
o
1 C
o
0 ~ 1800 C
TC - B
o
1 C
Sensor Type Accuracy
Resolution
Range
1
±oC
1
±oC

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OUTPUT 2
LOGIC
HEAT
User can select Heat logic for control Output 2 in which OP2 will remain ON till
PV<SP2 (PV increases when output is ON).
User can select Cool logic for control Output 2 in which OP2 will remain ON till
PV> SP2 (PV decreases when output is ON).
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DESCRIPTION DEFAULT
TABLE 3 : Below listed options will appear only if OP2 is selected as an Auxiliary Control Mode .
INPUT
TYPE
If selected, User can set SP2 value independently, irrespective of SP1.
In this mode SP2 is always related with SP1.
User can set SP2 value with deviation of ± 99°C w.r.t SP1.
ABS
SET
POINT
2
Enable
If Enabled, User can View & edit the Set point (SP2) in USER list.
If disabled, User can not View or edit Set Point (SP2) in USER list.
6OIM AI-7X82 V2.0 Page 6 of 9
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DESCRIPTION DEFAULT
OUTPUT 2
MODE
Disable
This parameter will appear only if Control logic is Heat-Cool.
If Enabled, User can set Diff. mode for OUTPUT 2 in USER list.
If disabled, User can not set Diff. mode for OUTPUT 2 in USER list.
OUTPUT 2
CONTROL
15.0
This parameter will appear only if Control logic is Heat-Cool.
OP2 will be OFF at Ambient + OP2C value irrespective of output 2 mode.
Auxiliary
Toggle
OUTPUT 2
FUNCTION
This parameter allows the user to select output 2 as an ‘Auxiliary’ control.
For options refer Table 3.
This parameter allows the user to select output 2 as an ‘Alarm’ control.
For options refer Table 4.
This parameter allows the user to select output 2 as a ‘Soak’ mode.
For options refer Table 5.
This parameter allows the user to select output 2 to function as both ‘Alarm’ &
‘Soak’. For options refer Table 4 & 5.
By pressing DOWN key, Lower display will Toggle between SP1-value, SP2-
value, Alarm SP-Value(AL.SP) & Timer-value(SOAK).
By this parameter Lower display will only show the SP1-value.
By this parameter Lower display will only show the Timer value(SOAK TIME).
15
Default USER LOCK CODE is 15 to access Control & Configuration List.
User has a choice to set its own USER LOCK CODE between 1 to 9999, this is to
prevent unauthorized access of Control & Configuration List.
USER
LOCK
CODE
LOWER
DISPLAY
MESSAGE
SET
POINT 1
Enable
If Enabled, User can View & edit the Set point (SP1) in USER list.
If disabled, User can only View the Set Point (SP1) but Can not edit it in USER
list.

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TABLE 4 : Below listed points will appear only if O/P2 is selected as an Alarm mode. In Alarm mode, Controller
continuously compares PV with either SP (for deviation or Band -alarm) or an independent Alarm set points (for
process high and process low alarm). HYS2 in Control list decides when to switch OFF the Alarm.
7OIM AI-7X82 V2.0 Page 7 of 9
Low Alarm : OP2 activates when PV<SP2.
OUTPUT-2 ON
OUTPUT-2 OFF
SP2
PV
SP2
OUTPUT-2 OFF
OUTPUT-2 ON PV
High Alarm : OP2 activates when PV>SP2.
OUTPUT-2 OFF
OUTPUT-2 ON
SP2
PV
Direct acting
SP2
OUTPUT-2 ON
OUTPUT-2 OFF PV
Reverse acting
DEVIATION
Band Alarm : OP2 activates when PV falls outside the band w.r.t. SP1 in either
direction.
OUTPUT ONOUTPUT ON
PV
SP1
SP2SP2
OUTPUT OFF
OUTPUT OFF OUTPUT OFF
PV
SP1
SP2SP2
OUTPUT ON
LOWER
DISPLAY UPPER
DISPLAY
PARA
METER DEFAULT
DESCRIPTION
ALARM
TYPE
ALARM
LOGIC
DIRECT
User can select direct Alarm Logic in which OP2 will be ON under alarm condition;
otherwise OFF (used for audio visual alarm).
User can select Reverse Alarm Logic in which OP2 will be ON in normal
conditions & will be OFF under alarm conditions (used to trip the process in alarm
conditions).
ALARM
INHIBIT
If this parameter is set as ‘YES’ & Alarm condition persists, it will Disable Alarm
O/P at power ON.
If this parameter is set as ‘NO’ & Alarm condition persists, it will Enable Alarm O/P
at power up.
NO
ALARM
ACK.
AUTO
Once the Alarm is activated, User has following three options to de-activate it.
When PV falls within the programmed limits The Alarm will be de-activated
automatically.
Once the alarm is activated, it remains activated until acknowledged manually by
UP key.
Once the alarm is activated, it can be de-activated either by pressing UP key or
when PV falls within the alarm limits.
ALARM
SET
POINT
Enable
If Enabled, User can View & edit the Alarm Set point in USER list.
If disabled, User can not View or edit Alarm Set Point in USER list.
High Deviation Alarm : OP2 activates when PV is greater than SP1 ± set
deviation value
OUTPUT ON
PV
SP1
OUTPUT OFF
OUTPUT OFF
+Ve
dev
PV
Sp1
OUTPUT ON
Low Deviation Alarm : OP2 activates when PV is less than SP1 ± set deviation
value
OUTPUT OFF
PV
OUTPUT ON
OUTPUT ON
PV
OUTPUT OFF
SP2 SP2
SP2 SP2
OUTPUT ON
PV
SP1
OUTPUT OFF
OUTPUT ON
PV
OUTPUT OFF
SP2
SP2
OUTPUT OFF
PV
SP1
OUTPUT ON
OUTPUT OFF
PV
OUTPUT ON
SP2
SP2
-Ve
dev
+Ve
dev
+Ve
dev
+Ve
dev
-Ve
dev
-Ve
dev
-Ve
dev

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Note : - 1) User can restart soak time at any moment during its execution, by pressing START key for 3 sec.
TABLE 5 : Below listed option will appear only if OP2 is selected as a soak timer.
8OIM AI-7X82 V2.0 Page 8 of 9
If set as ‘YES’, soak time value will not be stored at the time of power failure.
If set as ‘NO’ at power ON, soak time will continue from stored value.
(Note: Seconds will not be stored.)
RESET
OF
RUNNING
SOAK
TIME
NO
If selected, soak timer will increment (from 0 to set value)
(Note:- User can alter the new time value which should be > elapsed time even if
soak timer is running. If user sets new time value < elapsed time, running timer
will be terminated & End of soak Strategy will be executed.
If selected ,soak timer will decrement (from set value to 0).
(Note:- User can alter the new time value even when soak timer is running. In this
case, balance time of previous set value will be ignored & new cycle will be
executed.
DIRECTION
FOR
SOAK
TIME
DN
User can define 4 different modes to start the soak timer as follows : -
In this mode, Timer will start after pressing START key for 3 sec., irrespective of
PV.
In this Mode, after power ON Timer starts when PV >= SV. To continue with next
cycle, user has to either switch Power on & off OR press START key for 3 sec
when STRT message is displayed on the lower display.
In this Mode, Timer will start only after pressing START key for 3 sec & PV>=SV
for any of the following conditions.
(1) At every Power ON.
(2) Completion of current soak time cycle.
(3) Power failure during soak time is in progress.
TIMER
START
MODE
MOD 2
In this Mode, Timer will start only after pressing START key for 3 sec & PV>=SV
for any of the following conditions.
(1) At every Power ON.
(2) Completion of current soak time cycle.
After executing start command, if cycle doesn't complete due to power failure,
cycle will continue whenever PV >= SV after restore of power. No need to press
START key.
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DEFAULT
DESCRIPTION
END OF
SOAK
STRATEGY
It defines the behaviour of the controller at the end of soak timer cycle . Options
are as below. If selected, the controller maintain PV at SP indefinitely irrespective
of start or end of a soak timer.
The controller de-energizes OP1 as soon as the soak time is over. Here upper
display will continue to show PV & lower display will show message "start".Next
cycle will start only when user press START key for 3 sec.
The controller energizes OP2 for a time period programmed via (StdL) parameter
at the end of a soak time cycle. User can utilise OP2 for audio/visual indication.
The controller executes both, the Heater OFF and Alarm ON function as
described above.
BOTH
User can select the timer base of soak time among the four options as shown.
Minutes & Seconds (Range 99 minutes, 59 seconds).
Minutes (Range 9999 minutes).
Hours & Minutes (Range 99 Hours , 59 minutes).
Hours (Range 999.9 Hours).
TIME
BASE
SOAK
TIMER
MMMM

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AUTO TUNING MODE : To enter in this mode, Press and hold SHIFT key for minimum 3 sec.
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DEFAULT
DESCRIPTION
This function will be executed only if selected control action is PID & Auto tune is
Enable.
The Auto-tuning function can be initiated by setting this parameter to YES. The
decimal of LSB flashes till auto tuning function is in progress. During Auto-tuning,
The controller learns the process characteristics by itself & calculates required P, I
& D values.
User can cancel or abort this feature by setting this parameter to NO.
AUTO
TUNING
MODE
NO
USER GUIDE : -
ON-OFF ACTION : In this mode, Output (Relay/SSR) remains ON till actual temperature reaches to the set point value. On
reaching to SP, Output turns OFF & remains OFF till actual temperature drops down (in Heat Logic) or raises (in Cool Logic)
equal to hysterisis set by user. (As shown in Fig. 3.1 & 3.2)
AUTO TUNING MODE : In this mode, Controller learns the process characteristics by itself and calculates the required P,I &
D values. It can be performed at any time after power ON but, it is best to start it when the process is at Ambient temperature
in order to minimize overshoot & undershoot. Auto tuning is applied in case of :
(1) Initial set up for a new process.
(2) Substantial change in SP from previous auto tuning value.
(3) Control accuracy is not satisfactory.
If the control performance by using auto-tuning is still unsatisfactory, User can apply further adjustments of P,I & D values as
shown in Table:3 below.
Fig: 3.1
HEAT LOGIC / ON-OFF TIME
0
TEMP ( C)
HYSTERISIS
SP
ON ON ON
AMB
O/P OFF
OFF
Fig: 3.2
TIME
COOL LOGIC / ON OFF
O/P O/P
0
TEMP ( C)
AMB HYSTERISIS
ON ON ON
SP
OFF OFF
Proportional Band
Integral Time
Derivative Time
Slow Response
Over Shoot or Oscillations
Slow Response
Instability or Oscillation
Slow Response or Oscillation
High Over Shoot
Decrease PB
Increase PB
Decrease Int
Increase Int
Decrease Dt
Increase Dt
Adjust Symptom Solution
Table: 3
NC : Normally Close terminal of relay
NO : Normally Open terminal of relay
OP1 : Output 1
OP2 : Output 2
C.A. : Control Action
CJC : Cold junction compensation
CM : Common terminal of relay
LWC : Lead wire (Length)-
compensation
SP1 : Set Point Value (set temp.)
PV : Process Value (actual Tmp.)
SSR : Solid State Relay
T/C : Thermocouple
ABBREVIATION :
9OIM AI-7X82 V2.0 Page 9 of 9
413, New Sonal Link Service Industrial Premises Co-op Society Ltd,
Building No.2, Link Road, Malad (W), Mumbai - 400064.
Tel: [phone];
E-mail : [e-mail]
Website : www.itherm.co.in
Mfgd by: Innovative Instruments & Controls LLP
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