Panasonic KT4 User Manual

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Instruction manual

To prevent accidents arising from the misuse of this controller, please ensure the operator receives this manual.

SAFETY PRECAUTIONS

Be sure to read these precautions before using our products.
The safety precautions are classified into categories: “Warning” and “Caution”.

Warning : Procedures which may lead to dangerous conditions and cause death or serious injury, if not

carried out properly.

Caution : Procedures which may lead to dang erous conditions and cause superficial to medium injury

or physical damage or may degrade or damage the product, if not carried out properly.

• When using this controller on occasions which serious injury would be expected to occur or when damage is
likely to expand or proliferate, make sure to take safety measures such as installing double safety structures.

• Do not use this controller in an environment with flammable gases, or it may cause explosion.

• Fasten the electric wire with the t erminal screws securely. Imperfect connection m ay cause a bnormal
heating or fumes.

• Use this controller according to the rating and environmental conditions. Otherwise a bnormal heating or
fumes may occur.

• Do not touch the terminals while t he power is supplied to the controller, as this may cause electric shock.

• Do not disassemble or modify the controller, as this may cause electric shock or fumes.

Temperature Controller KT4

Warning

Caution

No.KT41E9 2006.08

Caution

• This instrument should be used in accordance with the specifications described in the manual.
If it is not used according to the specifications, it may malfunction or cause fire.

• Be sure to follow the warnings, cautions and notices. Not doing so could cause serious injury or accidents.

• The contents of this instruction manual are subject to change without notice.

• This instrument is designed to be installed in a control panel. If not, measures must be taken to ensure

that the operator cannot touch power terminals or other high voltage sections.

• Be sure to turn the power supplied to the instrument OFF before cleaning this instrument.

• Use a soft, dry cloth when cleaning the instrument.
(Alcohol based substances may cause tarnishing or defacement of the unit)

• As the display section is vulnerable, do not strike or scratch it with a hard object.

• Any unauthorized transfer or copying of this document, in part or in whole, is prohibited.

• Matsushita Electric Works, Ltd. is not liable for any damage or secondary damage(s) incurred as a result
of using this product, including any indirect damage.

• To pull out the inner assembly, release the hooks at the top and bottom of the instrument with thin, hard
tweezers. (If the hooks are released too far, they may break, or IP 66 function could deteriorate.)

Do not pull out the inner assembly except when repairing the instrument.)

1. Model number

1.1 Explanation of model number
A K T 4

(1) (2) (3) (4) (5) (6) (7)

(1) Supply voltage ---------------------- 1: 100 to 240V AC, 2: 24V AC/DC
(2) Input type ----------------------------- 1: Multi-input (Thermocouple, RTD, DC current and DC voltage
can be selected by key operation)
(3) Control output (OUT1) ------------ 1: Relay contact, 2: Non-contact voltage, 3: DC current
(4) Alarm output ------------------------- 1: A1 output, 2: A1 output + A2 output

1

(The alarm type and Energized /Deenergized can be selected
by key operation)
(When A2 output is applied, Heating/Cooling control cannot be
added)

1

(5) Heating/Cooling control (OUT2)-- 0: Not available, 4: Non-contact relay output

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(6) Heater burnout alarm -------------- 0: Not available, 1: Available (5A), 2: Available (10A), 3: Available
(20A), 4: Available (50A)
(Heater burnout alarm is not available for the DC current output)
(7) Serial communication ------------- 1: Available (The number is indicated only when the serial
communication is applied.)

1.2 How to read the rated label

The rated label is attached to the case.

When Heater burnout alarm is added, CT rated current is written in the bracket.

(1)

(2)

(1) Model number, supply voltage, input type, output type, etc. are entered.
(2) Lot number is entered.

A K T 4 1 1 1 1 0 0 1

No.

(e.g.)

Supply voltage: 100 to 240V AC

Multi-input
Relay contact output

A1 output

Heating/Cooling control is not added.
Heater burnout alarm is not added.
Serial communcation is applied.

2. Name and functions of the sections

(1) PV display: Indicates the PV (input value) with a red LED.

(1)

(2) SV display: Indicates the SV (main set value) with a green LED.
(3) SV1 indicator: The green LED lights when SV is indicated

on the SV display.

(2)

(4) OUT1 indicator: When OUT1 or heating output is ON, a

green LED lights. (For DC current output type, it flashes
corresponding to the MV (manipulated variable) in 0.25

(3)

second cycles.

(5) OUT2 indicator: When OUT2 is ON, a yellow LED lights.

(6) A1 indicator: When A1 output is ON, a red LED lights.
(7) EVT indicator: When Event output (A2 output, Heater

burn out alarm output) is ON, a red LED lights.

(8) AT indicator: While auto-tuning or auto-reset is being

performed, the yellow LED flashes.

(Fig. 2-1) (9) TX/RX indicator: The yellow LED flashes while serial

communication is performing.

control output OFF function works.
(To cancel the function, press the OUT/OFF key again for approx. 1 second.)

(10) (11) (12) (13)

(10) Increase key : Increases the numeric value.
(11) Decrease key : Decreases the numeric value.
(12) Mode key : Selects the setting mode or registers the set value.

(By pressing the Mode key, the set value can be registered)

(13) OUT/OFF key : The control output is turned on or off. If this key is pressed for approx. 1 second,

(4)

(5)

(6)
(7)

(8)

(9)

Notice

When setting the specifications and functions of this controller, connect terminals 1 and 2 for power
source first, then set them referring to “5. Setup” and “7. Operation flowchart” before performing
“3. Mounting to the control panel” and “4. Wiring”.

3. Mounting to the control panel

3.1 Site selection

This instrument is intended to be used under the following environmental conditions
(IEC61010-1): Overvoltage category

Ensure the mounting location corresponds to the following conditions:

• A minimum of dust, and an absence of corrosive gases

• No flammable, explosive gases

• Few mechanical vibrations or shocks

• No exposure to direct sunlight, an ambient temperature of 0 to 50 (32 to 122 )

that does not change rapidly

• An ambient non-condensing humidity of 35 to 85%RH

• No large capacity electromagnetic switches or cables through which large current is flowing

• No water, oil or chemicals or where the vapors of these substances can come into direct

contact with the controller

, Pollution degree 2

2

3.2 External dimensions (Unit: mm)

A

yp

r

(*)

)

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Gasket A

Screw t

e mounting bracket

Terminal cove

(Fig. 3.2-1)

3.3 Panel cutout (Unit: mm)

75

(Fig. 3.3-1)

3.4 CT (Current transformer) external dime nsions (Unit: mm)

48

IP66 specification may be compromised, and all
warranties will be invalidated.

45

+0.5

48

11.5

0

+0.5

45

0

n x 48-3

95

101 (*)

Lateral close mounting

+0.5

0

n: Number of unit s mounted

Caution: If lateral close mounting is used for the controller ,

44.5

59.7

48 (*)

Terminal cover (AKT4801

0

+0.5

45

AKT4815 (for 5A, 10A, 20A) AKT4816 (for 50A)
(Fig. 3.4-1)

3.5 Mounting

Mount the controller vertically to fulfill the Dust-proof/Drip-proof specification (IP66).
Mountable panel thickness: 1 to 15mm
Insert the controller from the front side of the panel.
Attach the mounting brackets by the holes at the top and bottom of the case and secure the controller

in place with the screws.

(Fig.3.5-1)

not use excessive force while
screwing in the mounting
bracket, or the case or screw
type mounting bracket could be
damaged.
The torque is approximately

0.12N•m.

Warning

s the case is made of resin, do

4. Wiring
Warning

Turn the power supply to the instrument off before wiring or checking it.
Working or touching the terminal with the power switched on may result in severe
injury or death due to Electric Shock.

3

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• RELAY : Relay contact output

• OUT1 : Control output 1 (Heating output)

• OUT2 : Control output 2 (Cooling output)

• V/A : DC voltage output/DC current

output

• S : Non-contact relay output

• A1 : Alarm 1 output

• EVT : Event output (A2 output, Heater

burnout alarm output)

• CT : CT input

• TC : Thermocouple

• RTD : Resistance temperature detector

•

• DC : DC current, DC voltage

RS-485: Serial communication

(Fig. 4-1)

Notice

• The terminal block of the KT4 Series is designed to be wired from the left side.

The lead wire must be inserted from the left side of the terminal, and fastened by the
terminal screw.

• Dotted lines show options.

• Use a thermocouple and compensating lead wire according to the sensor input specification of

this controller.

• Use the 3-wire RTD which corresponds to the input specification of this controller.

• This controller does not have built-in power switch, circuit breaker or fuse. Therefore, it is

necessary to install them in the circuit near the external controller.
(Recommended fuse: Time-lag fuse, rated voltage 250V AC, rated current 2A)

• For a 24V AC/DC power source, do not confuse polarity when using direct current (DC).

• When using a relay contact output type, use a relay according to the capacity of the load to

protect the built-in relay contact.

• When wiring, keep input wires (thermocouple, RTD, etc.) away from AC sources or load wires

to avoid external interference.

• If A2 and Heater burnout alarm are applied together, they share common output terminals.

Lead wire solderless terminal

Use a solderless terminal with an insulation sleeve in which an M3 screw fits as shown below.

The torque is approximately 0.6N•m to 1.0N•m.

Solderless

terminal

Y type

Round type

Nichifu Terminal Industries CO.,LTD.

Japan Solderless Terminal MFG CO.,LTD.
Nichifu Terminal Industries CO.,LTD.

Japan Solderless Terminal MFG CO.,LTD.

Manufacturer Model

1.25Y-3

VD1.25-B3A

1.25-3

V1.25-3

(Fig. 4-2)

Tightening

torque

0.6N•m
Max. 1.0N•m

5.8mm or less

5.8mm or less

3.2mm

3.2mm

Option: Heater burnout alarm

(1) This alarm is not usable for detecting heater current

under phase control.

(2) This alarm is not usable for detecting 3-phase

heater current.

CT

(11)

CT input Terminal

(12)

Power
supply

(3) Use the current transformer (CT) provided, and pass one

lead wire of the heater circuit into the hole of the CT.

(4) When wiring, keep CT wire away from AC sources

or load wires to avoid the external interference.

(Fig. 4-3)

Heater

4

5. Setup

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Wire the power terminals only. After the power is turned on, the sensor input character and temperature
unit are indicated on the PV display and the input range high limit value is indicated on the SV display for
approximately 3 seconds. (Table 5-1)
(If any other value is set during the scaling high limit setting, the set value is indicated on the SV display.)
During this time, all outputs and the LED indicators are in OFF status.
Control will then start indicating the input value (PV) on the PV display and main set value (SV) on the SV display.
(While control output OFF function is working,
(Table 5-1)

Sensor input

K

J
R
S
B
E
T
N
PL­C (W/Re5-26)

Pt100

JPt100

4 to 20mA DC
0 to 20mA DC
0 to 1V DC
0 to 5V DC
0 to 10V DC
1 to 5V DC

5.1 Main setting mode
Character

(PV display)

5.2 Sub-setting mode

Character

(PV display)

PV display SV display PV display SV display

SV 0

• Sets SV.

• SV low limit to SV high limit, or Scaling low limit value to scaling high limit value

AT setting/Auto-reset setting

• Selects auto-tuning Perform or auto-reset Perform.

• If the auto-tuning is cancelled during the process, P, I and D values revert to the

previous value.

• When auto-tuning has not finished after 4 hours, it is cancelled automatically.

• Auto-reset is cancelled in approximately 4 minutes.
OUT1 proportional band setting 10

• Sets the proportional band for OUT1.

• The control action becomes ON/OFF action when set to 0 or 0.0.

• 0 to 1000

OUT2 proportional band setting 1.0 times

• Sets the proportional band for OUT2.

OUT2 becomes ON/OFF action when set to 0.0.

• Available only when Heating/Cooling control (option) is applied

• 0.0 to 10.0 times (multiplying factor to OUT1 proportional band)

Integral time setting 200 seconds

• Sets the integral time.

• Setting the value to 0 disables the function.

• Auto-reset can be performed when PD is the control action (I=0).

• 0 to 1000 seconds

Derivative time setting 50 seconds

• Sets the derivative time.

• Setting the value to 0 disables the function.

• 0 to 300 seconds

Scaling high
limit value

Name, Function, Setting range

Name, Function, Setting range

(2000 ), 0.0 to 999.9 ( ) or 0.0 to 100.0%

is indicated on the PV display.)

Scaling high
limit value

5

Default value

(SV display)

Default value

(SV display)

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ARW setting 50%

• Sets ARW (anti-reset windup).

• Available only when PID is the control action.

• 0 to 100%

OUT1 proportional cycle setting

• Sets proportional cycle for OUT1.

Relay contact output: 30 seconds
Non-contact voltage output: 3 seconds

• Not available for ON/OFF action or DC current output type.

With the relay contact type, if the proportional cycle time is decreased, the fre-

quency of the relay action increases and the life of the relay contact is shortened.

• 1 to 120 seconds

OUT2 proportional cycle setting 3 seconds

• Sets proportional cycle for OUT2.

• Not available if OUT2 is ON/OFF action

• Available only when Heating/Cooling control (option) is applied

• 1 to 120 seconds

A1 value setting 0

• Sets action point for A1 output. Setting the value to 0 or 0.0 disables the function (except

process high alarm and process low alarm).

• Not available if No alarm action is selected during A1 type selection

• Refer to (Table 5.2-1).

A2 value setting 0

• Sets action point for A2 output. Setting the value to 0 or 0.0 disables the function (except

process high alarm and process low alarm).

• Not available if No alarm action is selected during A2 type selection

• Refer to (Table 5.2-1).

.

and
measured
current
value are
indicated
alternately.

Heater burnout alarm value setting 0.0A

• Sets the heater current value for Heater burnout alarm.

• Available only when Heater burnout alarm (option) is added.

• When OUT1 is OFF, heater current value shows the same value as when OUT1 was on.

• Setting the value to 0.0 disables the function.

• It is recommended to set approx. 80% of the heater current value (set value)

considering the voltage fluctuation of power supply.

• Upon returning to set limits, the alarm will stop.

• Rating 5A : 0.0 to 5.0A Rating 10A: 0.0 to 10.0A

Rating 20A: 0.0 to 20.0A Rating 50A: 0.0 to 50.0A

(Table 5.2-1)

Alarm type Setting range

High limit alarm – (Input span) to input span ( ) *1
Low limit alarm – (Input span) to input span ( ) *1
High/Low limits alarm 0 to input span ( ) *1
High/Low limit range alarm 0 to input span ( ) *1
Process high alarm Input range low limit value to input range high limit value *2
Process low alarm Input range low limit value to input range high limit value *2
High limit alarm with standby – (Input span) to input span ( ) *1
Low limit alarm with standby – (Input span) to input span ( ) *1
High/Low limits alarm with standby 0 to input span ( ) *1

• When input has a decimal point, negative low limit value is –199.9, and positive high limit value is 999.9.

• All alarm types except process alarm are

deviation setting from the SV.
*1: For DC input, the input span is the same as the scaling span.
*2: For DC input, input range low (or high) limit value is the same as scaling low (or high) limit value.

5.3 Auxiliary function setting mode 1
Character

(PV display)

Name, Function, Setting range

Set value lock selection Unlock status

Default value

(SV display)

• Locks the set values to prevent setting errors.
The setting item to be locked depends on the selection.

• When Lock 1 or Lock 2 is selected, PID Auto-tuning or Auto-reset cannot be carried out.

•

(Unlock) : All set values can be changed.

(Lock 1): None of the set values can be changed.
(Lock 2): Only main setting mode can be changed.

(Lock 3): All set values except Input type can be changed. However, they return to
their previous value after power is turn ed off because they are not saved in t he non­volatile memory. Be sure to select Lock 3 when cha nging the set value freque ntly via
communication function. (If the value set by the communication function is the same as
the value before the setting, the value will not be written in the non-volatile memory .)

Do not change any setting item in Auxiliary function setting mode 2. If any item in
the mode is changed, it will affect other setting items such as the SV and Alarm
value.

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SV high limit setting 1370

• Sets the SV high limit.

• SV low limit to input range high limit value. For DC input, SV low limit to scaling high
limit value (The placement of the decimal point follows the selection)

SV low limit setting –200

• Sets the SV low limit.

• Input range low limit value to SV high limit. For DC input, scaling low limit value to SV
high limit (The placement of the decimal point follows the selection)

Sensor correction setting 0.0

• Sets the correction value for the sensor.

• –100.0 to 100.0

( )

For DC input, –1000 to 1000 (The placement of the decimal point follows the selection)

Communication protocol selection

• Selects the communication protocol.

• Available only when Serial communication (option) is applied.

• Not available if

• Modbus ASCII mode:

Instrument number setting 0

• Sets the instrument number. (Communication cannot be carried out unless an

is indicated

, Modbus RTU mode:

instrument number is individually set when communicating by connecting plural
instruments in serial communication.)

• Available only when Serial communication (option) is added.

• 0 to 95
Communication speed selection 9600bps

• Selects a speed to be equal to the speed of the host computer.

• Available only when Serial communication (option) is added.

• 2400bps:

Parity selection Even parity

• Selects the parity.

• Not available if Serial communication (option) is not added or if

, 4800bp s: , 9600bp s: , 19200bp s:

is selected

during the Communication protocol selection.

• No parity:

Stop bit selection 1

• Selects the stop bit.

, E ven parity: , Odd parity:

• Not available if Serial communication (option) is not added or if is selected
during the Communication protocol selection.

• 1 or 2

5.4 Auxiliary function setting mode 2
Character

(PV display)

Name, Function, Setting range

Input type selection K (–200 to 1370 )

• The input type can be selected fr om thermocouple (10 types), RTD (2 types), D C
current (2 types) and DC voltage (4 types), and the unit

K –200 to 1370

–199.9 to 400.0
J –200 to 1000
R 0 to 1760
S 0 to 1760
B 0 to 1820
E –200 to 800
T –199.9 to 400.0
N –200 to 1300
PL-

0 to 1390 :

C (W/Re5-26) 0 to 2315

:

:
:
:
:
:
:

:
:

:

Pt100 –199.9 to 850.0 :
JPt100 –199.9 to 500.0
Pt100 –200 to 850
JPt100 –200 to 500

:
:

:
4 to 20mA –1999 to 9999:
0 to 20mA –1999 to 9999:
0 to 1V –1999 to 9999:
0 to 5V –1999 to 9999:
1 to 5V –1999 to 9999:
0 to 10V –1999 to 9999:

K –320 to 2500

–199.9 to 750.0

J –320 to 1800
R 0 to 3200
S 0 to 3200
B 0 to 3300
E –320 to 1500
T –199.9 to 750.0
N –320 to 2300
PL-

0 to 2500 :

C (W/Re5-26) 0 to 4200
Pt100 –199.9 to 999.9
JPt100 –199.9 to 900.0
Pt100 –300 to 1500
JPt100 –300 to 900

/ can be selected as well.

Scaling high limit setting

Default value

(SV display)

:

:
:
:
:
:
:

:
:

:

:
:

:

:

9999

• Sets scaling high limit value.

• Available only for DC input type

• Scaling low limit value to input range high limit value

(The placement of the decimal point follows the selection)

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Scaling low limit setting –1999

• Sets scaling low limit value.

• Available only for DC input type

• Input range low limit value to scaling high limit value

(The placement of the decimal point follows the selection)

Decimal point place selection No decimal point

• Selects decimal point place.

• Available only for DC input

•

No decimal point: 1 digit after decimal point:
2 digits after decimal point:

PV filter time constant setting 0.0 seconds

3 digits after decimal point:

• Sets PV filter time constant.
(If the value is set too large, it affects control result due to the delay of response)

• 0.0 to 10.0 seconds

OUT1 high limit setting 100%

• Sets the high limit value of OUT1.

• Not available for ON/OFF action

• OUT1 low limit value to 105%

(Setting higher than 100% is effective to DC current output type)

OUT1 low limit setting 0%

• Sets the low limit value of OUT1.

• Not available for ON/OFF action.

• –5% to OUT1 high limit value

(Setting less than 0% is effective to DC current output type)

OUT1 ON/OFF action hysteresis setting 1.0

• Sets ON/OFF action hysteresis for OUT1.

• Available only when the control action is ON/OFF action

• 0.1 to 100.0

( )

For DC input, 1 to 1000 (The placement of the decimal point follows the selection)

OUT2 action mode selection Air cooling

• Selects OUT2 action from air cooling, oil cooling and water cooling.

• Not available if OUT2 is ON/OFF action or if Heating/Cooling control (option) is not added.

• Air cooling:

OUT2 high limit setting 100%

, oil cooling: , water cooling:

• Sets the high limit value of OUT2.

• Not available if OUT2 is ON/OFF action or if Heating/Cooling control (option) is not added.

• OUT2 low limit value to 105%

(Setting higher than 100% is effective to DC current output type)

OUT2 low limit setting 0%

• Sets the low limit value of OUT2.

• Not available if OUT2 is ON/OFF action or if Heating/Cooling control (option) is not added.

• –5% to OUT2 high limit value

(Setting less than 0% is effective to DC current output type)

Overlap band/Dead band setting 0.0

• Sets the overlap band or dead band for OUT1 and OUT2.

+ set value: Dead band – set value: Overlap band

• Not available if OUT2 is ON/OFF action or if Heating/Cooling control (option) is not added.

• –100.0 to 100.0

( )

For DC input, –1000 to 1000 (The placement of the decimal point follows the selection)

OUT2 ON/OFF action hysteresis setting 1.0

• Sets ON/OFF action hysteresis for OUT2.

• Available only when Heating/Cooling control (option) is added.

• 0.1 to 100.0 ( ),

For DC input, 1 to 1000 (The placement of the decimal point follows the selection)

A1 type selection No alarm action

• Selects an A1 type.

No alarm action :
High limit alarm :
Low limit alarm :
High/Low limits alarm :
High/Low limit range alarm:

Process high alarm :
Process low alarm :
High limit alarm with standby :

Low limit alarm with standby :

High/Low limits alarm with standby :

8

A2 type selection No alarm action

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• Selects an A2 type.

• Available only when A2 (option) is added

• Action selection and default value are the same as those of A1 type selection.

A1 action Energized/Deenergized selection Energized

• Selects Energized/Deenergized status for A1.

• Not available if No alarm action is selected during A1 type selection

• Energized: Deenerg ized:

A2 action Energized/Deenergized selection Energized

• Selects Energized/Deenergized status for A2.

• Not available if No alarm is selected during A2 type selection or if A2 (option) is not added

• Action selection and default value are the same as those of A1 action Energized/
Deenergized selection.

A1 hysteresis setting 1.0

• Sets hysteresis for A1.

• Not available if No alarm action is selected during A1 type selection

• 0.1 to 100.0 ( )
For DC input, 1 to 1000 (The placement of the decimal point follows the selection)

A2 hysteresis setting 1.0

• Sets hysteresis for A2.

• Not available if No alarm is selected during A2 type selection or if A2 (option) is not added

• Setting range and default value are the same as those of A1 hysteresis setting.

A1 action delayed timer setting 0 seconds

• Sets action delayed timer for A1.
When setting time passes after the input enters alarm output range, the alarm is activated.

• Not available if No alarm action is selected during A1 type selection

• 0 to 9999 seconds

A2 action delayed timer setting 0 seconds

• Sets action delayed timer for A2.
When setting time passes after the input enters alarm output range, the alarm is activated.

• Not available if No alarm is selected during A2 type selection or if A2 (option) is not added

• Setting range and default value are the same as those of A1 action delayed timer setting.

Direct/ Reverse control action selection

• Selects either Reverse (Heating) or Direct (Cooling) control action.

• Reverse (Heating):

AT bias setting 20

Direct (Cooling):

Reverse
(Heating) action

• Sets bias value during PID auto-tuning.

• Not available if input type is DC current or DC voltage.

• 0 to 50

Setting item not used: This item is indicated when Serial communication (option) is
Output status selection when input abnormal Output OFF

(0 to 100 )，or 0.0 to 50.0 (0.0 to 100.0 )

added. However, this cannot be used.

• Selects the output status of OUT1 and OUT2 (option) when DC input is overscale or

underscale. See “Input abnormality indication” on pages 17, 18.

• Available only for DC current output with DC input

•

: OFF(4mA) or OUT1(OUT2) low limit

: Outputs a value between OFF(4mA) and ON(20mA) or between OUT1(OUT2)

low limit value and OUT1(OUT2) high limit value, depending on a deviation.

OUT/OFF key function selection

• Selects whether OUT/OFF key is used for control output

OUT/OFF
function

OUT/OFF function or for Auto/Manual control function.

• (OUT/OFF function) (Auto/Manual control function)

ARW function

ARW (Anti-reset windup) prevents overshoot caused by the integral action. The smaller the ARW value, the less

the overshoot caused by the integral action in the transition status, however it takes time until stabilization.

Sensor correction function

This corrects the input value from the sensor. When a sensor cannot be set at a location where control
is desired, the sensor measuring temperature ma y deviate from the temperature in the controlled
location. When controlling with plural controllers, the accuracy of sensors affects the control. Therefore,
sometimes the measured temperature (input value) does not concur.
In such a case, the control can be set at the desired temperature by adjusting the input value of sen sors.

9

Energized/Deenergized

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When [Alarm action Energized] is selected, the alarm output (between terminals 3-4, or 3-5) is conducted
(ON) while the alarm output indicator is lit.
The alarm output is not conducted (OFF) while the alarm output indicator is not lit.

When [Alarm action De energized] is se lected, the alarm output (betwee n terminals 3-4, or 3-5) is not
conducted (OFF) while the alarm output indicator is lit.
The alarm output is conducted (ON) while the alarm output indicator is not lit.

Hig h limit alarm (When Energized is set) High limit alarm (When Deenergized is set)
(Fig. 5.4-1) (Fig. 5.4-2)

5.5 Auto/Manual control function

Auto/Manual control function

• If Auto/Manual control function is selected in the OUT/OFF key function selection, Automatic or
Manual control function can be switched by pressing the

If control action is switched from automatic to manual or vice versa, balanceless-bumpless function
works to prevent rapid change of manipulated variable.
When automatic control is switched to manual control, the 1st decimal point from the right flashes on
the SV display, and the output manipulated variable (MV) on the SV display can be increased or
decreased by pressing

By pressing the

(Whenever the power to the controller is turned on, automatic control starts.)

ON

OFF

SV setting

A1 hysteresis

ON

OFF

+ A1 set point

Name, Function

or key to perform the control.

key again, the mode reverts to the PV/SV display mode (automatic control).

SV setting

A1 hysteresis

+ A1 set point

key in the PV/SV display mode.

5.6 Control output OFF function
Character

(PV display)

5.7 Output manipulated variable (MV) indication

Output manipulated variable indication

• In the PV/SV display mode, press the

Keep pressing the key until the output manipulated variable appears, though the main setting
mode appears temporarily during the process. (The SV display indicates output manipulated variable
and a decimal point flashes in 0.5 second cycles.)
If the

Control output OFF function

• A function to pause the control action or turn the control output of the unused instrument
of the plural units OFF even if the power to the instrument is supplied.

] is indicated on the PV display while the function is working.

[

• Once the control output OFF function is enabled, the function cannot be released

even if the power to the instrument is turned OFF and ON again.

To cancel the function, press the

Name, function

key is pressed again, the mode reverts to the PV/SV display.

Name, Function

key again for approx. 1 second.

key for approx. 3 seconds.

6. Running

After the unit is mounte d to the control panel and wiring is completed, operate the unit following the
procedures below.

(1) Turn the power supply to the KT4 Series ON.

• For approx. 3sec after the power is switched ON, the sensor input character and the temperature unit
are indicated on the PV display and input range high limit value is indicated on the SV display.
See (Table 5-1). (If any other value has been set during the scaling high limit setting, the SV display
indicates it.) During this time, all outputs and LED indicators are in OFF status.

• After that, control starts indicating input value(PV) on the PV display, and main set value(SV) on the SV display .

• While the Control output OFF function is working,

(2) Input each set value, referring to “5. Setup”.
(3) Turn the load circuit power ON.

Control action starts so as to keep the control target at the main set value (SV).

10

is indicated on the PV display.

7. Operation flowchart

[

]

y

pp

Outline of operation procedure

Operation before running

[STEP 1 Initial setting]

in Auxiliary function setting mode 2.

[STEP 2 Adjusting item]

[STEP 3 Lock setting]

[STEP 4 Run setting]

: Set Input type, Alarm type, Control action, etc.

: Set PID values and Alarm values in the

Sub setting mode.

: Set the Set value Lock, SV high limit and SV low

limit in Auxiliary function setting mode 1 (If Step 3
is not necessary, skip this step.)

: Set SV (desired value) in the Main setting mode.

Alarm 1 (A1) setting procedure
[Numbers (1) to (5) are indicated on the flowchart.]

(1) [A1 type]: Select an Alarm 1 type.

[If an alarm type except for
are indicated and they can be set if necessary.]

(2) [A1 action Energized/Deenergized]: Select Alarm 1 contact

output ON (Energized:
(3) [A1 hysteresis]: Set A1 hysteresis.
(4) [A1 action delayed timer]: Set A1 action delayed time.

(If input enters alarm action range and setting time has passed,

the alarm is activated.)
(5) [A1 value]: Set an action point of A1 output.

[Note] If an alarm type is changed, the alarm set value

becomes 0 (0.0). Therefore it is necessary to reset it.

is selected, items (2) to (5)

) or OFF (Deenergized: ).

Control output OFF function or

Auto/Manual control function

SV (Desired value)

PV

Press the key.

[Main setting mode] [Sub setting mode]

SV

SV

Reverts to PV/SV display.

Explanation of key

: This means that

is pressed, the set

if
value is saved, and the
controller proceeds to the
next setting item.

Press key for approx. 1sec.

Press the while holding down the key.

AT/Auto-reset

PV

OUT1 proportional

PV SV

OUT2 proportional

PV SV

PV SV

PV SV

PV

OUT1 proportional

PV SV

OUT2 proportional

PV SV

SV

/

Selection

band

Set value

band

Set value

Integral time

Set value

Derivative time

Set value

ARW

SV

Set value

cycle

Set value

cycle

Set value

• If AT is cancelled during the process,

PID values revert to the previous value.

• Auto-reset is automatically cancelled
in 4 minutes.

• Set the value with , keys.

• ON/OFF action when set to 0 or 0.0

• Set the value with , keys.

• Available when Heating/Cooling

• Set the value with , keys.

• PD action when set to 0.

Auto-reset can be performed.

• Set the value with , keys.

• Setting the value to 0 disables the

• Set the value with , keys.

• Available for PID action

• Set the value with , keys.

• Not available for DC current output or

if OUT1 is ON/OFF action

• Set the value with , keys.

• Not available if OUT2 is ON/OFF

action

PV/SV display

control (OUT2) is added

function.

Press the ke

Press the key
for approx. 3sec.

Press for a

Set value Lock

PV

PV

PV

Sensor correction

PV

Communication protocol

PV

Instrument number

PV

Communication speed

PV

PV

SV

Selection

SV high limit

SV

SV low limit

SV

SV

SV

Selection

SV

SV

Parity

SV

.

Output MV indication

rox. 3sec while holdingdown .

Auxiliary function setting mode 1

• Make a selection with

keys.

• If Lock 1 or Lock2 is designated,

AT or Auto-reset does not work.

• Be sure to select Lock 3 when
using Serial communication.

Set value

Set value

Set value

Set value

Selection

Selection

• Set the value with

• Set the value with , keys.

• Set the value with

• Make a selection with ,

keys.

• Not available for

• Set the value with , keys.

• Make a selection with ,

keys.

• Make a selection with ,

keys.

• Not available if
during Communication protocol
selection

,

, keys.

, keys.

indication

is selected

(5)

A1 value

PV SV

A2 value

PV SV

Set value

Set value

• Set the value with , keys.

• Not available if
during A1 type selection

• Set the value with , keys.

• Not available if
during A2 type selection

is selected

is selected

Stop bit

PV

SV

Selection

Reverts to the PV/SV display.

• Make a selection with

• Not available if
during Communication protocol
selection

, keys.

is selected

Setting items with dotted lines are optional

Heater burnout alarm value

PV

.

SV

Set value

• Set the value with

• OFF when set to 0.0

, keys.

and they appear only when the options are

added.

Reverts to the PV/SV display.

11

8. Action explanation

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8.1 OUT1 action

Control

action

Relay contact

output

Non-contact

voltage output

DC current

output

Indicator

(OUT1) Green

: Acts ON or OFF.

8.2 EVT (Heater burnout alarm) action

Heating (Reverse) action Cooling (Direct) action

Proportional band

ON

OFF

6

7

Cycle action is performed according to deviation

+

6

12V DC

7

Cycle action is performed according to deviation Cycle action is performed according to deviation

+

6

20mA DC 20 to 4mA DC

7

Changes continuously according to deviation

Lit Unlit

6

7

6

++

12/0V DC

7

6

7

SV setting

6

7

6

0V DC

7

6

4mA DC

7

Unlit

Proportional band

ON

OFF

SV setting

6

7

Cycle action is performed according to deviation

++

6

0V DC 12V DC

7

+++

6

4mA DC

7

Changes continuously according to deviation

6

7

6

0/12V DC

7

6

4 to 20mA DC

7

6

7

+

6

7

++

6

20mA DC

7

Lit

Alarm action

ON

OFF

8.3 OUT1 ON/OFF action

Control

action

ON

OFF

Relay contact

output

6

7

+

Non-contact

voltage output

6

7

++

DC current

output

6

20mA DC

7

Indicator

(OUT1) Green

Lit

: Acts ON or OFF.

Setting

Load current

Output

LargeSmall

Indicator

3

5

3

5

UnlitLit

Heating (Reverse) action Cooling (Direct) action

Hysteresis

SV setting

6

7

6

+

7

6

4mA DC

7

6

7

+

6

0V DC12V DC

Unlit

0V DC 12V DC

7

6

+

4mA DC

7

Hysteresis

SV setting

+

+

20mA DC

ON

OFF

6

7

6

7

6

7

LitUnlit

12

Press the and keys for approx. 3 seconds.

[

Input type (character indication) and range

K –200 to 1370 :
–199.9 to 400.0
J –200 to 1000
R 0 to 1760
S 0 to 1760
B 0 to 1820
E –200 to 800
T –199.9 to 400.0
N –200 to 1300

0 to 1390 :

PL-

(W/Re5-26)

C

0 to 2315 :

:
:
:
:
:
:

:
:

Pt100 –199.9 to 850.0 :

JPt100 –199.9 to 500.0

Pt100 –200 to 850
JPt100 –200 to 500

:
:

:

K –320 to 2500

–199.9 to 750.0 :
J –320 to 1800
R 0 to 3200 :
S 0 to 3200 :
B 0 to 3300 :
E –320 to 1500 :
T –199.9 to 750.0 :
N –320 to 2300 :
PL- 0 to 2500 :

C

(W/Re5-26)

0 to 4200

Pt100 –199.9 to 999.9
JPt100 –199.9 to 900.0 :

Pt100 –30 0 to 1500
JPt100 –300 to 900 :

4 to 20mA DC –1999 to 9999:
0 to 20mA DC –1999 to 9999:
0 to 1V DC –1999 to 9999:
0 to 5V DC –1999 to 9999:
1 to 5V DC –1999 to 9999:
0 to 10V DC –1999 to 9999:

:

:

:

:

:

Alarm type

High limit alarm: The alarm action is deviation setting from the SV. The alarm is activated
if the input value reaches the high limit set value. Character indication:
Low limit alarm: The alarm action is

deviation setting from the SV. The alarm is activated
if the input value goes under the low limit set value. Character indication:
High/Low limits alarm: Combines High limit and Low limit alarm actions. When input value
reaches high limit set value or goes under the low limit set value, the alarm
is activated. Character indication:
High/Low limit range alarm: When input value is between the high limit set value and low

limit set value, the alarm is activated. Character indication:

Process alarm: Within the scale range of the controller, alarm action points can be set
at random and if the input reaches the randomly set action point, the alarm is
activated.
Character indication: Process high alarm

, Process low alarm

Alarm with standby function: When the power to the controller is turned on, even if the input

enters the alarm action range, the alarm is not activated. (If the controller is

allowed to keep running, once the input exceeds the alarm action point, the

standby function will be released.)

Character indication:

High limit alarm with standby :
Low limit alarm with standby :
High/Low limits alarm with standby :

PV

Input type

Scaling high limit

PV

Scaling low limit

PV

Decimal point place

PV

PV filter time

constant

PV

OUT1 high limit

PV

OUT1 low limit

PV

OUT1 ON/OFF action

hysteresis

PV

OUT2 action mode

PV

OUT2 high limit

PV

OUT2 low limit

PV

Overlap/Dead band

PV

OUT2 ON/OFF action

hysteresis

PV

Press the

and keys for approx. 3 seconds.

Auxiliary function setting mode 2]

SV

Selection

SV

Set value

SV

Set value

SV

Selection

SV

Set value

SV

Set value

SV

Set value

SV

Set value

SV

Selection

SV

Set value

SV

Set value

SV

Set value

SV

Set value

• Make a selection with the

• Default value:

• Set the value with the

• Available for DC current, DC voltage input

• Set the value with the

• Available for DC current, DC voltage input

• Make a selection with the

• Available for DC current, DC voltage input

• Set the value with the

• Set the value with the

• Not available for ON/OFF action

• Set the value with the

• Not available for ON/OFF action

• Set the value with the

• Available for ON/OFF action

• Make a selection with the , keys.

• Available if Heat/Cool control (OUT2) is added

• Set the value with the

• Available if Heat/Cool control (OUT2) is added

• Set the value with the

• Available if Heat/Cool control (OUT2) is added

• Set the value with the

• Available only when Heat/Cool control (OUT2) is
added

• Set the value with

• Available only when Heat/Cool control (OUT2) is
added

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

, keys.

(1)

(2)

A1 type

PV SV

A2 type

PV SV

A1 action Energized/

Deenergized

PV SV

A2 action Energized/

Deenergized

PV SV

(3)

A1 hysteresis

PV SV

A2 hysteresis

PV SV

A1 action delayed

(4)

PV SV

A2 action delayed

PV SV

Direct/Reverse control

PV SV

AT b ias

PV SV

Setting item not used

PV SV

Output status selection

when input abnormal

PV SV

Selection

Selection

Selection

Selection

Set value

Set value

timer

Set value

timer

Set value

Selection

Set value

Set value

Selection

• Make a selection with the , keys.

• Default value:

• Make a selection with the , keys.

• Available when A2 is added

• Make a selection with the , keys.

• Not available if

is selected during A1

type selection

• Make a selection with the , keys.

• Not available if

is selected during A2

type selection

• Set the value with the , keys.

• Not available if
type selection

• Set the value with the , keys.

• Not available if
type selection

is selected during A1

is selected during A2

• Set the value with the , keys.

• Not available if

is selected during A1

type selection

• Set the value with the , keys.

• Not available if

is selected during A2

type selection

• Make a selection with the , keys.

• Default value:

• Set the value with the , keys.

• Available for thermocouple, RTD input

• Do not set this item even if is indicated
on the PV display.

• Make a selection with the , keys.

• Available only when input is DC current and DC

voltage with DC current output.

OUT/OFF key function

13

PV SV

Selection

Reverts to the PV/SV display.

• Make a selection with the , keys.

8.4 A1 and A2 action

Alarm
action

ON

OFF

High limit alarm

SV

setting

High/Low limit range alarm

A1 hysteresis

+ A1 set pointA1 set point

A1 hysteresis A1 hysteresis A1 hysteresis

ON

OFF

A1 hysteresis

A1 set point

SV

+ A1 set point

setting

Process high alarm

ON

OFF

A1 set point

Alarm
action

ON

OFF

High limit alarm with standby High/Low limit alarm with standbyLow limit alarm with standby

SV

setting

A1 hysteresis A1 hysteresis A1 hysteresis

ON

OFF

ON

OFF

Alarm
action

ON

OFF

A1 set point

SV

setting

+ A1 set point

: Standby functions in this section.

ON

OFF

A1 set point

SV

setting

+ A1 set point

ON

OFF

A1 set point A1 set pointSV

A1 indicator lights when its output terminals 3 and 4 are connected (ON), and goes off when
they are not connected (OFF).
A2 indicator lights when its output terminals 3 and 5 are connected (ON), and goes off when
they are not connected (OFF).

8.5 Heating/Cooling control action

Control action

Relay contact

output (OUT1)

Heating P-band

ON

Heating

action

OFF

Cycle action is performed according to deviation.

(Cooling P-band)

ON

(Cooling

action)

OFF

SV setting

666

777

6

Non-contact

voltage output

(OUT1)

DC current

output (OUT1)

Non-contact

relay output

(OUT2)

Indicator

(OUT1) Green

Indicator

(OUT2) Yellow

+

12V DC

7

-

Cycle action is performed according to deviation.

6

+

20mA DC

7

-

Changes continuously according to deviation.

Lit

Unlit

: Acts ON (lit) or OFF (unlit).
: Represents Heating control action.
: Represents Cooling control action.

6

+

12/0V DC

7

-

6

+

20 to 4mA DC

7

-

Cycle action is performed according to deviation.

+

-

+

-

6

0V DC

7

6

4mA DC

7

333

555

Unlit

Lit

14

High/Low limits alarmLow limit alarm

SV

setting

Process low alarm

A1 set pointA1 set pointA1 set pointA1 set point

setting

A1 hysteresis

A1 set point

8.6 Heating/Cooling control action (when setting dead band)

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Control action

Relay contact

output (OUT1)

Non-contact

voltage output

(OUT1)

DC current

output (OUT1)

Non-contact

relay output

(OUT2)

Indicator

(OUT1) Green

Indicator

(OUT2) Yellow

ON

Heating

action

OFF

Cycle action is performed according to deviation.

6

+

12V DC

7

-

Cycle action is performed according to deviation.

6

+

20mA DC

7

-

Changes continuously according to deviation.

Lit

Unlit Lit

Heating P-band (Cooling P-band)

SV setting

6

+

12/0V DC

7

-

6

+

20 to 4mA DC

7

-

Dead band

(Cooling

action)

666

777

6

+

0V DC

7

-

6

+

4mA DC

7

-

3 3 3

5 5 5

Cycle action is performed according to deviation.

ON

OFF

Unlit

: Acts ON (lit) or OFF (unlit).

: Represents Heating control action.

: Represents Cooling control action.

8.7 Heating/Cooling control action (when setting overlap band)

Control action

Relay contact

output (OUT1)

Non-contact

voltage output

(OUT1)

DC current

output

(OUT1)

Non-contact

relay output

(OUT2)

Indicator

(OUT1) Green

Indicator

(OUT2) Yellow

ON

Heating

action

OFF

Cycle action is performed according to deviation.

6

+

12V DC

7

-

Cycle action is performed according to deviation.

6

+

20mA DC

7

-

Changes continuously according to deviation.

Lit

Unlit

Heating p-band

Cooling p-band

Overlap band

(Cooling

action)

SV setting

666

777

6

+

12/0V DC

7

-

6

+

20 to 4mA DC

7

-

+

-

+

-

6

0V DC

7

6

4mA DC

7

3 3 3

555

Cycle action is performed according to deviation.

Unlit

ON

OFF

Lit

: Acts ON (lit) or OFF (unlit).

: Represents Heating control action.
: Represents Cooling control action.

9. PID auto-tuning of this controller

In order to set each value of P, I, D and ARW automatically, the auto-tuning process should be made
to fluctuate to obtain an optimal value. One of 3 types of fluctuation below is automatically selected.

Sometimes the auto-tuning process will not fluctuate if auto-tuning is performed at or near room
temperature. Therefore auto-tuning might not finish normally.

15

(1) In the case of a large difference between the SV and processing temperature (PV) as the

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temperature is rising

When AT bias is set to 20

Temp.

SV

Temperature 20

(4)

, the AT process will fluctuate at the temperature 20 lower than the SV.

lower than the SV

Calculating PID constant

(1):

PID contatnt calculated

(2):

Controlled by the PID

(3):

constant set by auto-tuning.

(4):

AT bias value

AT

(1) (2) (3)

Time

:

Auto-tuning starting point

AT

(2) In the case of a stable control

The AT process will fluctuate around the SV.

Temp.

SV

Calculating PID constant

(1):

(2):

PID constant calculated
Controlled by the PID

(3):

constant set by auto-tuning

AT

(1) (2) (3)

Time

:

Auto-tuning starting point

AT

(3) In the case of a large difference between the SV and processing temperature (PV)

as the temperature is falling.

When AT bias is set to 20

Temp.

SV

(4)

Temperature 20 higher than the SV

, fluctuation is applied at the te mperature 20 higher tha n the SV .

(1): Calculating PID constant
(2): PID constant calculated
(3):

Controlled by the PID
constant set by auto-tuning

(4): AT bias value

:AT

AT

(1) (2) (3)

Time

Auto-tuning starting point

10. Specifications

10.1 Standard specifications
Mounting : Flush
Setting : Input system using membrane sheet key
Display PV display : Red LED 4 digits, character size 10.2 x 4.9 mm (H x W)

SV display : Green LED 4 digits, character size 8.8 x 4.9 mm (H x W)

Accuracy (Setting and Indication):

Thermocouple : Within
whichever is greater
However, for R, S input, 0 to 200
B input, 0 to 300
K, J, E, T, N input, less than 0
RTD : Within

within
DC current : Within
DC voltage : Within

Input sampling period : 0.25 seconds
Input Thermocouple : K, J, R, S, B, E, T, N, PL-

(However, for B input: External resistance, 40
RTD : Pt100, JPt100, 3-wire system

Allowable input lead wire resistance (10
DC current : 0 to 20mA DC, 4 to 20mA DC
Input impedance: External shunt resistor (AKT4810) 50
Allowable input current (50mA or less)
DC voltage : 0 to 1V DC Input impedance (1M
Allowable input voltage (5V or less)
Allowable signal source resistance (2k

0.2% of each input span 1digit, or within 2 (4 ),

(400 ): Within 6 (12 )

(600 ): Accuracy is not guaranteed

(32 ): Within 0.4% of input span 1digit

0.1% of each input span 1digit, or

1 (2 ), whichever is greater

0.2% of each input span 1digit

0.2% of each input span 1digit

, C(W/Re5-26) External resistance, 100 or less

or less)

or less per wire)

or more)

or less)

16

: 0 to 5V DC, 1 to 5V DC, 0 to 10V DC Input impedance (100k

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or more)

Allowable input voltage (15V or less)
Allowable signal source resistance (100

or less)

Control output (OUT1)

Relay contact : 1a, Control capacity 3A 250V AC (resistive load)
1A 250V AC (inductive load cosø=0.4)
Electrical life, 100,000 cycles
Non-contact voltage (For SSR drive): 12
DC current : 4 to 20mA DC, Load resistance, maximum 550

+2

V DC maximum 40mA (short circuit protected)

0

A1 output

Action : ON/OFF action

Hysteresis : 0.1 to 100.0

( ), or 1 to 1000

Output : Relay contact, 1a
Control capacity, 3A 250V AC (resistive load)
Electrical life, 100,000 cycles

Control action

PID action (with auto-tuning function)
PI action: When derivative time is set to 0
PD action (with auto-reset function): When integral time is set to 0
P action (with auto-reset function): When both derivative and integral times are set to 0.
ON/OFF action: When proportional band is set to 0 or 0.0
OUT1 proportional band : 0 to 1000

(2000 ), 0.0 to 999.9 ( ) or 0.0 to 100.0%

(ON/OFF action when set to 0 or 0.0)
Integral time : 0 to 1000sec (OFF when set to 0)
Derivative time : 0 to 300sec (OFF when set to 0)
OUT1 proportional cycle : 1 to 120sec (Not available for DC current output type)
ARW : 0 to 100%

OUT1 output hysteresis : 0.1 to 100.0

( ), or 1 to 1000

OUT1 output limit : 0 to 100% (DC current output type: –5 to 105%)

Circuit insulation configuration

Insulation resistance : 10M

1

Power

Power
supply

2

3

4

5

A1

EVT (A2, Heater burnout

alarm) or OUT2

or more, at 500V DC

11

12

Insulation

CT

input

Commu-

nication

Output

13

14

15

CPU

Input

6

7

8
9

10

Dielectric strength : 1.5kV AC for 1 minute between input terminal and power terminal

1.5kV AC for 1 minute between output terminal and power terminal
Supply voltage : 100 to 240V AC 50/60Hz, 24V AC/DC 50/60Hz
Allowable voltage fluctu atio n: 100 to 240V AC: 85 to 264V AC, 24V AC/DC: 20 to 28V AC/DC

Power consumption : Approx. 8VA

Ambient temperature

: 0 to 50 (32 to 122 )

Ambient humidity : 35 to 85%RH (no condensation)
Weight : Approx. 200g
External dimension : 48 x 48 x 96.5mm (W x H x D)
Material : Flame-resistant resin (Case)
Color : Ash gray (Case)
Attached function :

[Set value lock], [Sensor correct ion], [A uto/ma nu al cont ro l switching],

[Input abnormality indication]

Output status

Output status
selection when
input abnormal

Contents and

Indication

Overscale
Measured value
has exceeded
Indication range
high limit value.
"

" flashes.

Underscale
Measured value

has dropped below
Indication range low
limit value.
"

" flashes.

Direct action Reverse action Direct action

ON (20mA) or
OUT1 high
limit value
OFF (4mA) or
OUT1 low
limit value

OFF (4mA) or
OUT1 low
limit value

OUT1 OUT2

Reverse action

ON or

OFF (4mA) or
OUT1 low limit
value

OFF or
OUT2 low limit
value

OUT2 high limit
value
OFF or
OUT2 low limit
value

ON (20mA) or
OUT1 high
limit value
OFF (4mA) or
OUT1 low limit
value

ON or
OUT2 high limit
value
OFF or
OUT2 low limit
value

OFF or
OUT2 low limit
value

Only for DC input and DC current output type, [Output status selection when input abnormal] is
available. For other inputs and outputs except for DC input and DC current output, the output status
will be the same one as when OFF is selected during [Output status selection when input abnormal].
For manual control, the preset MV (manipulated variable) is outputted.

17

Thermocouple and RTD input

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Input Input range Indication range Control range

K，T

–199.9 to 400.0 –199.9 to 450.0 –205.0 to 450.0
–199.9 to 750.0

–199.9 to 850.0 –209.0 to 850.0

–199.9 to 850.0 –199.9 to 900.0 –210.0 to 900.0

Pt100

–200 to 850 –210 to 900 –210 to 900
–199.9 to 999.9 –199.9 to 999.9 –211.0 to 1099.9
–300 to 1500

–318 to 1600 –318 to 1600

–199.9 to 500.0 –199.9 to 550.0 –206.0 to 550.0

JPt100

–200 to 500 –207 to 550 –207 to 550
–199.9 to 900.0 –199.9 to 999.9 –211.0 to 999.9
–300 to 900

–312 to 1000 –312 to 1000

Indication range and Control range for the thermocouple inputs except the above:
[Input range low limit value – 50

(100 )] to [input range high limit value + 50 (100 )]

DC current and voltage input
Indication range : [Scaling low limit value – Scaling span x 1%] to [Scaling high limit value

+Scaling span x 10%]
(If the input value is out of the range –1999 to 9999, the PV display flashes

“

” or “ ”)

Control range : [Scaling low limit value – Scaling span x 1%] to [Scaling high limit value

+Scaling span x 10%]

DC input disconnection: When DC input is disconnected, PV display flashes “
20mA DC and 1 to 5V DC inputs, and “

” for 0 to 1V DC input.

” for 4 to

For 0 to 20mA DC, 0 to 5V DC and 0 to 10V DC inputs, the PV display
indicates the value corresponding with 0mA or 0V input.

[Burnout]: When the thermocouple or RTD input is burnt out, OUT1 is turned OFF (for DC current

output type, OUT1 low limit value) and PV display flashes “

”.

[Self-diagnosis]: The CPU is monitored by a watchdog timer, and when an abnormal status is

found on the CPU, the controller is switched to warm-up status.

[Automatic cold junction temperature compensation] (Only thermocouple input type)

This detects the temperature at the connecting terminal between the thermocouple and instrument,

and always keeps it set to the same status as when the reference junction is located at 0

[Power failure countermeasure]:

The setting data is backed up in the non-volatile memory.

[Warm-up indication]

After the p ower supply to the instrument is turned on, the sensor input character an d
temperature unit are indicated on the PV display and input range high limit value is indicated on
the SV display for 3 seconds.
For DC current and voltage inputs, the scaling high limit value is indicated.

Accessories included: Screw type mounting bracket 1 set, Instruction manual 1 copy

CT (Current transformer); For rating 5A, 10A, 20A (AKT4815) 1 piece
For rating 50A, (AKT4816) 1 piece

Accessories sold separately: Terminal cover (AKT4801) 1 piece, 50

shunt resistor (AKT4810) 1 piece

(32 ).

10.2 Optional specifications
Alarm 2 (A2)

If A2 and Heater burnout alarm are applied together, they utilize common output terminals.
Action : ON/OFF action
Hysteresis : 0.1 to 100.0

( ), or 1 to 1000

Output : Relay contact, 1a

Control capacity, 3A 250V AC (Resistive load)

Electrical life, 100,000 cycles

Heater burnout alarm (including sensor burnout alarm)

Watches the heater current with CT (current transformer), and detects the burnout.

This alarm is also activated when indication is overscale and underscale.
(To detect Heater burnout, a CT for 50A can also be used for 5A, 10A and 20A ratings, however, this
is not suitable for small ampere ratings due to a low degree of accuracy. For a 20A rating or less, use
a CT designated for 20A.)

This option cannot be applied to DC current output type.
If A2 and Heater burnout alarm are applied together, they utilize common output terminals.
Rating : 5A, 10A, 20A, 50A (Must be specified)
Setting range : 5A, 0.0 to 5.0A (Off when set to 0.0) 10A, 0.0 to 10.0A (Off when set to 0.0)
20A, 0.0 to 20.0A (Off when set to 0.0) 50A, 0.0 to 50.0A (Off when set to 0.0)
Setting accuracy : Within

5% of the rated value
Action : ON/OFF action
Output : Relay contact 1a

Control capacity, 3A 250V AC (resistive load)
Electrical life, 100,000 cycles

18

Heating/Cooling control (OUT2)

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• OUT2 side

Proportional band: 0.0 to 10.0 times OUT1 proportional band (ON/OFF action when set to 0.0)
Proportional cycle: 1 to 120 seconds

• Overlap band/Dead band setting range

Thermocouple, RTD inputs: –100.0 to 100.0
DC current, DC voltage inputs: –1000 to 1000 (The placement of the decimal point follows the selection)

( )

• OUT2 output ON/OFF action hysteresis setting

Thermocouple, RTD inputs: 0.1 to 100.0
DC current, DC voltage inputs: 1 to 1000 (The placement of the decimal point follows the selection)

( )

• Integral and derivative times are the same as those of OUT1.

• OUT2 action mode selection function

Air cooling (linear characteristic), Oil cooling (1.5th power of the linear characteristic),
Water cooling (2nd power of the linear characteristic)

• Output: Non-contact relay, Control capacity; 0.3A 250V AC

Serial communication

The following operations can be carried out from the external computer.
(1) Reading and setting of SV, PID and various set values
(2) Reading of the PV and action status
(3) Change of the functions
Cable length : Max. communication distance 1000m, Cable resistance; Within 50
Communication interface : EIA RS-485
Communication method : Half-duplex communication start stop synchronous
Communication speed : 2400, 4800, 9600, 19200bps (Selectable by keypad operation)
Parity : Even, Odd and No parity (Selectable by keypad operation)
Stop bit : 1, 2 (Selectable by keypad operation)
Communication protocol : Modbus RTU, Modbus ASCII (Selectable by keypad operation)
Connectable number of units : Maximum 31 units to 1 host computer
Communication error detection : Parity, checksum (LRC, CRC)

11. Tr oubleshooting

If any malfunctions occur, refer to the following items after checking the power supply to the controller.

11.1 Indication
Problem

PV display is indicating [ ].

[ ] is flashing on the PV
display.

[ ] is flashing on the PV
display.

• Control output OFF function is working.
Press the

• Thermocouple, RTD or DC voltage (0 to 1V DC) is burnt out.
Change each sensor.

How to check whether the sensor is burnt out

[Thermocouple]

If the input terminal of the instrument is shorted, and if a value

around room temperature is indicated, the instrument is likely to

be operating normally, however, sensor may be burnt out.
[RTD]
If approx. 100
between A-B of the instrument and between B-B is shorted, and
if approximate 0

operating normally, however, the sensor may be burnt out.
[DC voltage (0 to 1V DC)]

If the input terminal of the instrument is shorted, and if a scaling
low limit value is indicated, the instrument is likely to be operating
normally, however, the signal wire may be disconnected.

• Check whether the input terminals of thermocouple, RTD or DC voltage
(0 to 1V DC) are securely mounted to the instrument input terminals.

Connect the sensor terminal to the instrument input terminal securely.

• Check whether the input signal source of DC voltage (1 to 5V DC)
or DC current (4 to 20mA DC) is disconnected.

How to check whether the input signal wire is disconnected

[DC voltage (1 to 5V DC)]

If the input to the input terminal of the instrument is 1V DC and if
a scaling low limit value is indicated, the instrument is likely to be
operating normally, however, the signal wire may be disconnected.

[DC current (4 to 20mA DC)]

If the input to the input terminal of the instrument is 4mA DC and
if a scaling low limit value is indicated, the instrument is likely to be
operating normally, however, the signal wire may be disconnected.

• Check if the input signal wire of DC voltage (1 to 5V DC), DC current

(4 to 20mA DC) is securely connected to the instrument input terminals.

Connect the signal lead wire to the instrument input terminal securely.

19

Presumed cause and solution

key for approx. 1 second to release the function.

of resistance is connected to the input terminals

(32 ) is indicated, the instrument is likely to be

[

CTi Automation - Phone: [phone] - Fax: [phone] - Web: www.ctiautomation.net - Email: [e-mail]

] is flashing on the PV

display.

The PV display keeps indicating
the value which was set during
scaling low limit value.

The indication of PV display is
abnormal or unstable.

The PV display is indicating
[

].

11.2 Key operation
Problem

• Unable to set the SV, P, I, D,
proportional cycle or alarm
setting

• The values do not change by
, keys.

The setting indication does not
change in the input range even if
the

and new values are unable to be set.

, keys are pressed,

11.3 Control
Problem

Temperature does not rise.

The control output remains in
an ON status.

The control output remains in
an OFF status.

• Check whether the polarity of thermocouple or compensating lead
wire is correct.

• Check whether codes (A, B, B) of RTD agree with the instrument
input terminals. Ensure that they are wired properly.

• Check whether the input signal source for DC voltage (0 to 5V DC,

0 to 10V DC) and DC current (0 to 20mA DC) is disconnected.

How to check whether the input signal wire is disconnected

[DC voltage (0 to 5V DC, 0 to 10V DC)]

If the input to the input terminal of the instrument is 1V DC and if a
value corresponding to 1V DC is indicated, the instrument is likely to
be operating normally, however, the signal wire may be disconnected.

[DC current (0 to 20mA DC)]

If the input to the input terminal of the instrument is 1mA DC and if a

value corresponding to 1mA DC is indicated, the instrument is likely to

be operating normally, however, the signal wire may be disconnected.

• Check whether the input terminal of DC voltage (0 to 5V DC, 0 to

10V DC) and DC current (0 to 20mA DC) is securely mounted to the
instrument input terminals. Ensure that DC input terminals are
mounted to the instrument input terminals securely.

• Check whether sensor input or temperature unit (
Select the sensor input and temperature unit (

or ) is correct.

or ) properly.

• Sensor correcting value is unsuitable. Set it to a suitable value.

• Check whether the specification of the sensor is correct.

Set the sensor to the proper specification.

• AC leaks into the sensor circuit. Use an ungrounded type sensor.

• There may be equipment that interferes with or makes noise near

the controller.
Keep equipment that interferes with or makes noise away from the
controller.

• Internal memory is defective.

Contact our agency or us.

Presumed cause and solution

• Set value lock (Lock 1 or Lock 2) has been selected.
Release the lock selection.

• During PID auto-tuning or auto-reset.
In the case of PID auto-tuning, cancel auto-tuning.
It takes approximately 4 minutes until auto-reset is finished.

• SV high or low limit value in the Auxiliary function setting mode 1

may be set at the point where the value does not change.
Set it to a suitable value while in the Auxiliary function setting mode 1.

Presumed cause and solution

• Sensor is out of order.
Change the sensor.

• Check whether the sensor is se curely mounted to the instrument
input terminal.
Check whether control output terminals are se curely mounted
to the actu ator input terminals.
Mount the sensor or control output terminal securely.

• Ensure that the wiri ng of sensor or contro l output terminal is
correct.

• OUT1 or OUT2 low limit value is set to 100% or higher
during Auxiliary function setting mode 2.
Set it to a suitable value.

• OUT1 or OUT2 high limit value is set to 0% or less during
Auxiliary function setting mode 2.
Set it to a suitable value.

20