i-therm Px-428 Operation instructions

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USER’S OPERATING MANUAL FOR PID DIGITAL TEMPERATURE CONTROLLER
(Models: Px 428 / 728 )
SPECIFICATIONS : -
1
SAFETY INSTRUCTION :
installing or commissioning of controller. All safety
GENERAL
the controller must not exceed the maximum specified
operation. Incorrect configuration could result in
related instruction appearing in this manual must be
applications. It is important to read the manual prior to
or it may lead personnel injury.
to the user after installation.
vThe Controller in its installed state must not come in
vThe Controller in its installed state should not be
exposed to carbon dust, salt air, direct sunlight or
vAmbient temperature and relative humidity surrounding
ELECTRICAL
vCircuit breaker or mains s/w with fuse (275V/1A) must
close proximity to any corrosive/combustible gases,
followed to ensure safety of the operating personnel as
v The controller must be configured correctly for intended
v The controller is generally part of control panel and in
well as the instrument.
such a case the terminals should not remain accessible
This controller is meant for temperature control
MECHANICAL
products.
vThe controller in its installed state must be protected
interferences. Ventilation holes provided on the chassis
must comply with local electrical regulation.
vCare must be taken not to connect AC supplies to low
caustic vapours, oils, steam or any other process by-
radiant heat.
of the instrument are meant for thermal dissipation
voltage sensor input.
vTo minimize pickup of electrical noise, the wiring for low
damage to the equipment or the process under control
limit for proper operation of the controller.
to protect the controller from any possible damage due
driving high voltage loads to protect the controller from
this, use shielded ground at both ends.
against excessive electrostatic or electromagnetic
hence should not be obstructed in the panel.
vThe controller should not be wired to a 3-Phase supply
such supply could rise above 264 VAC which will damage
any possible damage due to short circuit on loads.
vCircuit breaker and appropriate fuses must be used for
vThe controller must be wired as per wiring diagram & it
to high voltage surges of extended duration.
high current power cables. Where it is impractical to do
the controller.
be installed between power supply and supply terminals
vThe Electrical noise generated by switching inductive
loads might create momentary Fluctuation in display,
alarm latch up, data loss or permanent damage to the
with unearthed star connection. Under fault condition
voltage DC and sensor input must be routed away from
being controlled.
spoiling the product, this could damage the process
to avoid any failure of heating system. Apart from
instrument. To reduce this use snubber circuit across
the load.
v It is essential to install a over Temp. Protection device
2 : Alarm Status
S : Soak Timer
T : Tuning Status (Only Px-X28)
Range : Refer below table.
2. INPUT
CJC for TC : Built in automatic
1. DISPLAY TYPE : Dual 4- Digit 7 Segment LED
4 Digit Bright White (PV)
4 Digit Luminous Green (SV)
STATUS LED’S : 1 : Main Control Output
Sensor input : TC:J,K,R,S,N,T,B, RTD: Pt-100 & Pt-100(RTD 0.1)
Sampling Time : 125 msec.
Resolution : 1°C/0.1°C(Only for RTD)
LWC for Pt-100 : Built in upto 18E max.
3. RELAY OUTPUT
Digital Filter : 1 to 10 Sec.
Contact type : N/O, CM, N/C
Contact Rating : 5A @ 250VAC or 30 VDC
Life expectancy : > 5,00,000 operations
Isolation : Inherent
Compliance : ----
3) Soak timer
Isolation : Non-Isolated.
1) Auxiliary control
5. FUNCTION
6. ENVIRONMENTAL
Output 1 : Main Control output
2) Alarm
Storage Humidity : 95% Rh (Non-condensing)
Consumption : 4W Maximum.
8. PHYSICAL
7. POWER SUPPLY
Control Action : ON-OFF/PID (Select)
Housing : ABS Plastic
Drive Capacity : 12V @ 30mA.
Output 2 : Programmable
4) Alarm + Soak timer
Control Mode : Heat, Cool, Heat/Cool (Select)
4. SSR DRIVE OUTPUT
Operating Range : 0 ~50°C, 5~90% Rh
Supply Voltage : 90~270VAC, 50/60Hz.
Model no.
Display height (PV)
Display height (SV)
Px-428
0.36” 0.70”
0.24” 0.50”
Px-728
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
OIM Px-X28 V2.0 Page 1 of 9
(72x72)
Px-728
(48x48)
Px-428

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SET START RESET
AT
-therm
i
Px-728
T
T
S
1
2
PV
SV
i
-therm
Px-428
AT START RESET
SET
T
S
1
2
2
MECHANICAL INSTALLATION
The label on the controller identifies the serial number, wiring connections and batch number.
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.
Px-428 Px- 728
OVER ALL DIMENSIONS & PANEL CUT OUT (IN MM)
INSTALLATION GUIDELINES :
3. Push the controller through panel cut-out and secure the
controller in its place by tightening the side clamp.
2. Remove clamp from controller
1. Prepare the cut-out with proper dimension as shown in figure.
MODEL:Px428/728/928
AEF
PANEL
CUTOUT
FRONT PANEL LAYOUT
FRONT PANEL LAYOUT DESCRIPTION :
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.
(1) For SP programming. (2) To access Control mode. (3) To access Configuration mode along with UP key. (4) To scroll the
parameter & to store its value.
(1) To increase/alter parameter value in program mode. (2) To enter in configuration mode (with SET key). (3) To acknowledge Alarm.
(4) To enter in tune mode (with DOWN key).
(1) To decrease/alter parameter value in program mode. (2) To enter in tune mode (with UP key).
It will display (1) Measured value of selected input or Error messages in run mode. (2) Parameters value in program mode.
It will display (1) SP (Main set point) / SP2 (Auxiliary/Alarm) set value / Set Soak time value/ balance or elapsed soak time in run
mode. (2) Parameter code in program mode.
1
2
3
4
5
6
7
Sr. NAME FUNCTION
(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.
OP1 LED
OP2 LED
SOAK LED
UPPER
DISPLAY
LOWER
DISPLAY
SET
KEY
SHIFT
KEY
UP
KEY
DOWN
KEY
OIM Px-X28 V2.0 Page 1 of 9
Px- 728
50 370 45 45 45
TABLE : 1
Model
Dim A B C D F GE
Px- 428
Model no.
Weight (gms.)
Px-428 Px-728
50
72 72 3 60 68 68 68
130 200
Px-428 Px-728
4
5
7
1
2
3
6
4
5
7
1
2
3
6
OP2
NO
NC
CM
16
10
3
2
4
5
8
NO
NC
CM
OP1-RLY
9
7
OP1-SSR
12 13
11
1514 16
Digital I/P
R
W
W
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OP2-RLY
NO
NC
CM
OP1-RLY
NO
NC
CM
w
w
R
1
2
3
4
5
6
714
13
12
11
10
9
8
15
18 20
19
16 17
Digital I/P
OP2-SSR OP1-SSR
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PV
SV

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PROGRAMMING
USER LIST : To access the user list press SET key once.
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.
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.
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.
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.
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.
CONTROL LIST : To enter in this mode, press SET & DOWN key simultaneously for 3 sec. User can then set the
following control parameters.
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.
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.
(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).
This parameter is prompted if SP2 is Enable & output 2 is configured as
SOAK
TIME
SET
POINT 2
CONTROL
SET POINT
----------
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.
User can set ramp rate/min for SP1 (Set Point) to minimize overshoot.
This parameter will be available only if Enabled in Configuration List.
RAMP
RATE
Output 2 will be automatically activated /de-activated w.r.t SP1 & HYS.
This parameter is prompted only if Control Logic for Output1 is
configured for Heat-Cool.
Output 2 will be permanently Activated (ON).
Output 2 will be permanently De-Activated (OFF).
User has a choice to set different Lock Code via USER LOCK CODE in
Config. List.
Set this parameter to 15 (Default LOCK CODE) to access Control List.
1 ~ 9999
LOCK
CODE
PROPOR
TIONAL
BAND
INTEGRAL
TIME
DERIV
ATIVE
TIME
CYCLE
TIME
OUTPUT
POWER
LIMIT
OUTPUT
OFF
0°C
0°C
Disable
Disable
Auto
1 min.
0
5.0°C
240
60
16.0 sec.
100 %
LSPL ~ HSPL
0.0 °C
to
25.0 °C
LSPL ~ HSPL
-99 to +99°C
2 to 99°C
1 Sec to
9999 Hrs.
OP2
MODE
PARA
METER
PARA
METER
LOWER
DISPLAY
LOWER
DISPLAY
UPPER
DISPLAY
UPPER
DISPLAY
RANGE
RANGE
DESCRIPTION
DESCRIPTION
DEFAULT
DEFAULT
OIM Px-X28 V2.0 Page 3 of 9
50 %
to
100 %
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.)
TUNE
OFFSET 100 %

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(3) Press SET key to store current parameter & move on to the next parameter.
(2) Press UP or DOWN key to scroll between parameter options.
CONFIGURATION LIST : (1) To enter in this mode, press and hold SET & UP key simultaneously for 3 sec.
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.
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
This parameter value is set according to the type of sensor (Thermocouple or RTD
input) connected to the controller's input terminals.
50 %
to
100 %
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.)
TUNE
OFFSET 100 %
0
to
500 Sec.
o
1 to 25 C
o
1 to 25 C
0
to
500 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
-9.9
to
9.9°C
0
to
99 Sec.
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’.
CONTROL
HYS
DELAY 1
DELAY 2
HYS 2
GAP 2
GAP 1
SOAK
TIME
DELAY
SOAK
BAND
2°C
2°C
120 Sec.
0°C
0°C
0 Sec.
10 Sec.
0 Sec.
0
TC - J
LOCK
CODE
INPUT
TYPE
PARA
METER
LOWER
DISPLAY
UPPER
DISPLAY RANGE DESCRIPTION DEFAULT
LOWER
DISPLAY
UPPER
DISPLAY
PARA
METER DESCRIPTION DEFAULT
OIM Px-X28 V2.0 Page 4 of 9

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If Enabled, this parameter will be prompted if user press Up & Down keys
Simultaneously for 3Sec.
This parameter will be prompted only if selected control action is PID.
If Disabled, this parameter will not be prompted if user press Up & Down keys
Simultaneously for 3Sec.
Sets the minimum limit for set point adjustment. It can be set from minimum
specified range of selected sensor to HSPL value.
Sets the maximum limit for set point adjustment. It can be set from LSPL value to
maximum specified range of selected sensor.
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 : -
(ii)To match the display values with another recorder or indicator measuring the
same PV.
(i) To compensate for known thermal gradient.
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.
User can select between PID or ON-OFF action algorithm to be adopted for
output.
User can select heating logic in which OP1 will remain ON till PV < SP.
(PV increases when output is ON.)
(PV decreases when output is ON.)
User can select cooling logic in which OP1 will remain ON till PV > SP.
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.
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.
When enabled, User can set the desired RAMP rate in USER list.
This parameter will be prompted only if OCP (over shoot control point) is disabled.
When disabled, this parameter will not be prompted in USER list.
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
INPUT
TYPE
LOWER
SET
POINT
LIMIT
HIGHER
SET
POINT
LIMIT
PROCESS
VALUE
OFFSET
INPUT
FILTER
CONTROL
LOGIC
FOR O/P 1
OVER
SHOOT
CONTROL
POINT
RAMP
RATE
AUTO
TUNE
TC - J
0°C
0°C
400°C
6
PID
Heat
Disable
Disable
Enable
CONTROL
MODE
FOR O/P 1
DEFAULT
DESCRIPTION
UPPER
DISPLAY
LOWER
DISPLAY
PARA
METER
OIM Px-X28 V2.0 Page 5 of 9

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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
OP2 will be OFF at Ambient + OP2C value irrespective of output 2 mode.
This parameter will appear only if Control logic is Heat-Cool.
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
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.
This parameter allows the user to select output 2 as an ‘Auxiliary’ control.
For options refer Table 3.
For options refer Table 4.
This parameter allows the user to select output 2 as an ‘Alarm’ control.
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.
OUTPUT 2
FUNCTION Auxiliary
When NONE is selected, Output 2 will be permanently de-activated.
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).
This parameter will appear only if Output 2 is set as SOAK/ AL.ST
By this parameter Lower display will show Setpoint till soak timer has not started
and afterwards, it will display the Timer value(SOAK TIME).
LOWER
DISPLAY
MESSAGE
SP1
LOWER
DISPLAY
RAMPING
SETPOINT
This parameter will appear only if Ramp rate is enabled.
If Enabled, User can View ramping setpoint.
If disabled, User can View target setpoint.
This parameter will appear only if Ramp rate is enabled.
Enable
TABLE 3 : Below listed options will appear only if OP2 is selected as an Auxiliary Control Mode .
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
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
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.
OIM Px-X28 V2.0 Page 6 of 9

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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.
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.)
(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 increment (from 0 to set value)
(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.
If selected ,soak timer will decrement (from set value to 0).
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.
(2) Completion of current soak time cycle.
(1) At every Power ON.
(3) Power failure during soak time is in progress.
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.
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.
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 9999 Hours).
END OF
SOAK
STRATEGY
TIME
BASE
SOAK
TIMER
DIRECTION
FOR
SOAK
TIME
RESET
OF
RUNNING
SOAK
TIME
TIMER
START
MODE
BOTH
MMMM
DN
NO
MOD 2
PARA
METER
LOWER
DISPLAY
UPPER
DISPLAY DESCRIPTION DEFAULT
OIM Px-X28 V2.0 Page 8 of 9

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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.
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
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
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).
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.
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.
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
ALARM
TYPE
ALARM
LOGIC
ALARM
INHIBIT
ALARM
ACK.
ALARM
SET
POINT
Low
Direct
No
Auto
Enable
PARA
METER
UPPER
DISPLAY
LOWER
DISPLAY DESCRIPTION DEFAULT
OIM Px-X28 V2.0 Page 7 of 9

9
E-mail : [e-mail]
338, New Sonal Link Service Industrial Premises Co-op Society Ltd,
Building No.2, Link Road, Malad (W), Mumbai - 400064.
Tel: [phone];
Website : www.itherm.co.in
Mfgd by: Innovative Instruments & Controls LLP
i
i
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.)
SSR : Solid State Relay
T/C : Thermocouple
PV : Process Value (actual Tmp.)
ABBREVIATION :
TEMP (°C)
SP
AMB
O/P
HYSTERISIS
ON ON ON
OFF OFF
HEAT LOGIC/ ON-OFF TIME
Fig : 3.1
TEMP (°C)
SP
AMB
O/P O/P
HYSTERISIS
ON ON ON
OFF OFF
TIME
Fig : 3.2
COOL LOGIC/ ON-OFF
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)
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.
(2) Substantial change in SP from previous auto tuning value.
(3) Control accuracy is not satisfactory.
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.
AUTO TUNING MODE : To enter in this mode, Press and hold SHIFT key for minimum 3 sec.
This function will be executed only if selected control action is PID & Auto tune is
Enable.
User can cancel or abort this feature by setting this parameter to NO.
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.
AUTO
TUNING
MODE
NO
PARA
METER
UPPER
DISPLAY
LOWER
DISPLAY DESCRIPTION DEFAULT
OIM Px-X28 V2.0 Page 9 of 9

9
Building No.2, Link Road, Malad (W), Mumbai - 400064.
Tel: [phone];
Website : www.itherm.co.in
E-mail : [e-mail]
338, New Sonal Link Service Industrial Premises Co-op Society Ltd,
Mfgd by: Innovative Instruments & Controls LLP
i
i
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
compensation
C.A. : Control Action
CJC : Cold junction compensation
CM : Common terminal of relay
LWC : Lead wire (Length)-
SP1 : Set Point Value (set temp.)
SSR : Solid State Relay
T/C : Thermocouple
PV : Process Value (actual Tmp.)
ABBREVIATION :
TEMP (°C)
SP
AMB
O/P
HYSTERISIS
ON ON ON
OFF OFF
HEAT LOGIC/ ON-OFF TIME
Fig : 3.1
TEMP (°C)
SP
AMB
O/P O/P
HYSTERISIS
ON ON ON
OFF OFF
TIME
Fig : 3.2
COOL LOGIC/ ON-OFF
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)
(2) Substantial change in SP from previous auto tuning value.
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 :
(3) Control accuracy is not satisfactory.
(1) Initial set up for a new process.
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.
AUTO TUNING MODE : To enter in this mode, Press and hold SHIFT key for minimum 3 sec.
This function will be executed only if selected control action is PID & Auto tune is
Enable.
User can cancel or abort this feature by setting this parameter to NO.
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.
AUTO
TUNING
MODE
NO
PARA
METER
UPPER
DISPLAY
LOWER
DISPLAY DESCRIPTION DEFAULT
OIM Px-X28 V2.0 Page 9 of 9