Omron K8AK-TH User manual

1
Temperature Monitoring Relay
K8AK-TH
Compact and Slim Relay Ideal for
Temperature Alarms and Monitoring
• Excessive temperature increases can be prevented and
abnormal temperatures can be monitored.
• Temperature monitoring in slim design with a width of just
22.5 mm.
• Rotary switches simplifies temperature settings.
• Universal-input support for thermocouple or platinum
resistance thermometer sensor input.
• Change the output relay between normally open and
normally closed operation.
• Alarm status identification with LED indicator.
•Self-holding output.
Ordering Information
K8AK-TH (Temperature Input Models)
* Refer to Setting Ranges on page 3 for the setting ranges.
Note: When ordering, designate the power supply specification. Different Relay models are used for 100 to 240 VAC and 24 VAC/VDC.
Refer to Safety Precautions on page 8.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Power supply
voltage
Type Output relays Input types Setting units (setting range) Model
100 to 240 VAC Temperature
input 1 relay Thermocouple or platinum resistance thermometer Setting unit: 1°C or 1°F (0 to 999°C/°F) K8AK-TH11S 100-240VAC
Thermocouple Setting unit: 10°C/°F* K8AK-TH12S 100-240VAC
24 VAC/DC Thermocouple or platinum
resistance thermometer Setting unit: 1°C or 1°F (0 to 999°C/°F) K8AK-TH11S 24VAC/DC
Thermocouple Setting unit: 10°C/°F* K8AK-TH12S 24VAC/DC
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K8AK-TH
2
Specifications
Ratings
Characteristics
Item Power supply voltage 100 to 240 VAC 50/60 Hz 24 VAC 50/60 Hz or 24 VDC
Allowable voltage range 85% to 110% of power supply voltage
Power consumption 5 VA max. 2 W max. (24 VDC), 4 VA max. (24 VAC)
Sensor inputs K8AK-TH11S Thermocouple: K, J, T, E; Platinum-resistance thermometer: Pt100, Pt1000
K8AK-TH12S Thermocouple: K, J, T, E, B, R, S, PLII
Output relay One SPDT relay (5 A at 250 VAC, resistive load)
External inputs
(for latch setting)
Contact input ON: 1 kΩmax., OFF: 100 kΩmin.
Non-contact input ON residual voltage: 1.5 V max., OFF leakage current: 0.1 mA max.
Leakage current: Approx. 10 mA
Setting method Rotary switch setting (set of three switches)
Indicators Power (PWR): Green LED, Relay output (ALM): Red LED
Other functions Alarm Mode (upper limit/lower limit), non-fail safe/fail safe selection, output latch, setting protection, temperature
unit °C/°F
Ambient operating temperature −20 to 55°C (with no condensation or icing)
Ambient operating humidity Relative humidity: 25% to 85%
Storage temperature −25 to 65°C (with no condensation or icing)
Measurement accuracy K8AK-TH11S: ±1% of the setting range or ±4°C, whichever is larger
K8AK-TH12S: ±1% of the setting range (±1% FS)
hysteresis width 2°C
Output relay Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC/30 VDC: 100,000 operations
Sampling cycle 100 ms
Insulation resistance 20 MΩ(at 500 V) between charged terminals and exposed uncharged parts
20 MΩ(at 500 V) between any charged terminals (i.e., between input, output, and power supply terminals)
20 MΩ(at 500 V) between contacts (open)
Dielectric strength 2,300 VAC, 50/60 Hz for 1 min between terminals of different charge
Vibration resistance Vibration of 10 to 55 Hz and acceleration of 50 m/s2for 5 min with 10 sweeps each in X, Y, and Z directions
Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes
Weight Approx. 160 g
Degree of protection IP20
Memory protection Non-volatile memory (number of writes: 1 million)
Safety
Standards
Approved standards UL 61010-1
Installation environment (pollution level 2, installation category II)
EMC EN 61326-1
Application standards UL 61010-1, Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14, CCC: GB14048.5
Terminal screw tightening torque 0.49 to 0.59 N·m
Crimp terminals Two solid wires of 2.5 mm2or two ferrules of 1.5 mm2with insulation sleeves can be tightened together.
Case color N1.5
Case material PC and ABS, UL 94 V-0
Mounting Mounts to DIN Track.
Dimensions 22.5 ×100 ×90 mm (W ×D ×H)
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K8AK-TH
3
Setting Ranges
●K8AK-TH11S
Centigrade
Fahrenheit
●K8AK-TH12S
Centigrade
Fahrenheit
●Temperature Input Range
Input K J T E Pt100 Pt1000
Setting tempera-
ture range
1,000
800
600
400
200
0
999 850 400 600 850 850
000000
Minimum setting increment 1°C
Input K J T E Pt100 Pt1000
Setting temperature
range
1,000
800
600
400
200
0
999 999 700 999 999 999
Å@ Å@ Å@ Å@ Å@
000000
Minimum setting increment 1°F
Input KJTEBRSPLII
Setting temperature
range
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
1,800
1,700 1,700
1,300 1,300
850
600
400
100
0000 000
Minimum setting increment 10°C
Input KJTEBRSPLII
Setting temperature
range
3,200
3,100
3,000
2,900
2,800
2,700
2,600
2,500
2,400
2,300
2,200
2,100
2,000
1,900
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
3,200
3,000 3,000
2,300 2,300
1,500
1,100
700
300
0000 000
Minimum setting increment 10°F
TH11S °C°FTH12S °C°F
Input
type
Lower
limit Upper limit Lower limit Upper limit Input type
Lower
limit Upper limit Lower limit Upper limit
K−20 1019 −40 1039 K−20 1320 −40 2340
J−20 870 −40 1039 J−20 870 −40 1540
T−20 420 −40 740 T−20 420 −40 740
E−20 620 −40 1039 E−20 620 −40 1140
Pt100 −20 870 −40 1039 B0182003240
Pt1000 −20 870 −40 1039 R−20 1720 −40 3040
--- --- --- --- --- S−20 1720 −40 3040
--- --- --- --- --- PLII −20 1320 −40 2340
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K8AK-TH
4
Connections
Wiring Diagrams
Timing Charts
Power supply
voltage*1
Power supply
voltage*1
Power supply
Relay output
Power supply
Relay output
External input
(LATCH_RST)*2
Sensor input
External input
(LATCH_RST)*2
Sensor input
Not used.Not used.
Not used.
Thermocouple Thermocouple
Pt resistance thermometer input
1
+−
2 3
456
14 11 12
A1 A2
1
+−
2 3
4 5 6
14 11 12
A1 A2
ABB
Not used. Not used.
K8AK-TH11S K8AK-TH12S
*1 The input power supply depends on the
model: 100 to 240 VAC or 24 VAC/VDC (no
polarity)
*2 Wiring of the external input terminals is as shown
below.
Relay output (normally closed) (11) to (14)
Relay output (normally open) (11) to (14)
Temperature alarm or other error
Power supply
Relay output (latched) (11) to (14)
LATCH_RST or external inputs (4) to (5)
Temperature alarm or other error
Power supply
PWR indicator
SV Protect Mode
Power supply
ALM indicator
Temperature alarm
Power supply
Other error
Temperature alarm lower limit (11) to (14)
Temperature alarm upper limit (11) to (14)
Temperature setting
0.02 s
2°C (°F)
2°C (°F)
Flashing
Flashing
Temperature Alarm: Hysteresis: 2°C/°F
Changing between Normally Open and Normally Closed
Latched Operation: Relay outputs remain latched even after the alarm
or error is reset.
Operation of Indicators
* To enter SV Protect Mode or reset the latch, turn ON the LATCH_RST signal or
external input for at least 5 seconds.
* Other errors: sensor open circuit error, sensor input error, temperature setting
error, and memory error.
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K8AK-TH
5
Nomenclature
Front Operations
●Error (ALM indicator: Flashing)
One of the following items 1 to 3 has occurred.
1. The sensor circuit is disconnected or the
temperature setting is out of the specified range.
2. The temperature setting is out of the specified range.
3. There is a problem in the internal circuits.
Corrections
1. Disable SV Protect Mode.
2. Disable the latch.
3. Check for incorrect wiring, circuit disconnections,
short circuits, and whether the input type and
temperature settings are correct.
4. If the wiring and settings are correct, reset the power
supply.
If the Unit resumes normal operation, the problem
may have been caused by noise.
If the Unit does not resume normal operation, it must
be replaced.
* The non-volatile memory stores the event when a latched output is
disabled, or the SV Protect Mode is enabled or disabled. An error
may occur if the data is updated more than one million times.
* If you press and hold the LATCH_RST button for 5 seconds or
longer, the SV Protect Mode will go into effect.
When SV Protect Mode is enabled, the PWR indicator flashes.
To disable the SV Protect Mode, press and hold the LATCH_RST
Button for at least 5 seconds.
●Alarm Setting Rotary Switch
Point the arrow to the required number.
Note: 1. Use solid-core wires of 2.5-mm2max. or ferrules with an
insulation sleeve to wire to this terminal.
To ensure the dielectric strength of the connection, do not
expose more than 8 mm of wire for insertion into the
terminal.
Recommended Ferrules
Phoenix Contact
Al 1.5-8BK (for AWG16)
•Al 1-8RD (for AWG18)
•Al 0,75-8GY (for AWG18)
2. Screw tightening torque: 0.49 to 0.59 N·m
Power supply
Relay output
ALM indicator (Red)
R_SW3
External input
(LATCH_RST)
Sensor input
PWR Indicator (Green)
LATCH_RST
button*
R_SW2
R_SW1
Temperature unit (Black
out the unnecessary
label: °C or °F)
8 mm max. 8 mm max.
For a solid wire
of 2.5-mm2of max. For ferrules with
an insulation sleeve.
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K8AK-TH
6
Operation Method
Function Selection DIP Switch
ON
OFF
* Default settings: All OFF
Switch (SW)
Settings
R_SW3
K8AK-TH11S 100°C/°F units (0 to 9)
R_SW2
R_SW1
* Default: 0°C
* Default: All OFF.
* SW8: Not used.
SW
1 2 3 4
K
5 6 7
J
T
E
Pt100
Pt1000
Not used.
Not used.
Upper limit alarm
Lower limit alarm
With latching
Without latching
OFF: Normally Open
ON: Normally Closed
Input type
ON
OFF
10°C/°F units (0 to 9)
1°C/°F units (0 to 9)
°C
EN 61010-1 Safety standards
EMI
EMS
EMC EN 61326-1
EN 61326-1
* Default: 0°C
* Default: All OFF.
* SW8: Not used.
R_SW3
K8AK-TH12S
R_SW2
R_SW1
SW
1 2 3 4
K
567
J
T
E
B
R
S
PLII
Input type
ON
OFF
100°C/°F units (0 to 9)
10°C/°F units (0 to 9)
Upper limit alarm
Lower limit alarm
With latching
Without latching
OFF: Normally Open
ON: Normally Closed
Turn OFF the power to the Temperature
Monitoring Relay before you change the
switch settings on the side panel.
The switch settings made on the side panel
take effect when the power is turned ON.
Use a precision screwdriver to manipulate
the switches and button.
°F
°C
°F
1,000°C/°F units (0 to 3)
* A temperature setting error
occurs if this switch is set to a
value from 4 to 9.
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K8AK-TH
7
Functions
●SV Protection
This function protects (i.e., prohibits changing) the alarm setting, operating method, and modes for the Temperature Monitoring Relay that have
been set on the rotary switches and DIP switch.
The protection function is activated by pressing the output latch reset button on the Temperature Monitoring Relay for at least 5 s or by turning ON
the input to the external input terminal for at least 5 s.
The power indicator will flash when the protection is activated.
The protection function can be released by pressing the output latch reset button on the Temperature Monitoring Relay for at least 5 s or by turning
ON the input to the external input terminal for at least 5 s.
The power indicator will light while the protection is being reset.
Dimensions (Unit: mm)
Note: All units are in millimeters unless otherwise indicated.
Temperature Monitoring Relay
Track Mounting Products (Sold Separately)
22.5
90
100
5
K8AK-TH
4.5
15 25 25
10 10
1000 (500) (See note.)
25 25 15 (5)
(See note.)
35±0.3
7.3±0.15
27±0.15
1
●DIN Tracks
PFP-100N
PFP-50N
* Dimensions in parentheses are for the PFP-50N.
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K8AK-TH
8
Safety Precautions
Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/.
Warning Indications
Meaning of Product Safety Symbols
Electrical shock may cause minor injury.
Do not touch terminals while electricity is being supplied.
There is a risk of minor electrical shock, fire, or device failure.
Do not allow any pieces of metal, conductors, or cutting chips
that occur during the installation process to enter the product.
Explosions may cause minor injuries. Do not use the product
in locations with inflammable or explosive gases.
There is a risk of minor electrical shock, fire, or device failure.
Do not disassemble, modify, repair, or touch the inside of the
product.
Loose screws may cause fires. Tighten terminal screws to the
specified torque of 0.49 to 0.59 N·m.
Use of excessive torque may damage the terminal screws.
Tighten terminal screws to the specified torque of 0.49 to
0.59 N·m.
If the setting does not match the element to be monitored, the
product may behave unexpectedly and damage the machine
or cause accidents. Set the Temperature Monitoring Relay as
described below.
•Adjust each set value on the Temperature Monitoring Relay
correctly for the element that is to be monitored.
•Turn OFF the power to the Temperature Monitoring
Relay before you change the switch settings on the side
panel. The switch settings made on the side panel take
effect when the power is turned ON.
If the Temperature Monitoring Relay fails, monitoring and
alarm outputs may fail to operate. This may result in physical
damage to the facilities, equipment, or other devices that are
connected to it. To reduce this risk, inspect the product
regularly. To make the product fail-safe, take alternative safety
measures, such as the installation of monitoring devices on a
separate circuit.
Use of the product beyond its life may result in contact welding
or burning. Make sure to consider the actual operating
conditions and use the product within its rated load and
electrical life count. The life of the output relay varies
significantly with the switching capacity and switching
conditions.
CAUTION Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury or in property damage.
Precautions for Safe
Use
Supplementary comments on what to do or
avoid doing, to use the product safely.
Precautions for
Correct Use
Supplementary comments on what to do or
avoid doing, to prevent failure to operate,
malfunction, or undesirable effects on
product performance.
Used to warn of the risk of electric shock under
specific conditions.
Used for general prohibitions for which there is no
specific symbol.
Used to indicate prohibition when there is a risk of
minor injury from electrical shock or other source if
the product is disassembled.
Used for general mandatory action precautions for
which there is no specified symbol.
CAUTION
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K8AK-TH
9
1. Do not use or store the product in the following locations.
•Locations subject to water or oil
•Locations subject to direct radiant heat from heating equipment
•Outdoor locations or under direct sunlight
•Locations subject to dust or corrosive gases (particularly
sulfurizing gases, ammonia, etc.)
•Locations subject to rapid temperature changes
•Locations prone to icing and dew condensation
•Locations subject to excessive vibration or shock
2. Use and store the product in a location where the ambient
temperature and humidity are within the specified ranges. If
applicable, provide forced cooling.
3. Mount the product in the correct direction.
4. Check terminal polarity when wiring and wire all connections
correctly. The power supply terminals do not have polarity.
5. Do not wire the input and output terminals incorrectly.
6. Make sure the power supply voltage and loads are within the
specifications and ratings for the product.
7. Make sure the type of the thermocouple matches the input type
that the Temperature Monitoring Relay is designed for.
8. If you need to extend the length of the lead wires on the
thermocouple, make sure to match the type of thermocouple and
always use compensating conductors.
9. To extend the lead wires on the platinum resistance thermometer,
use lead wires with a low resistance (5 Ωor less per wire), and
make the resistance equal on all three lead wires.
10.Make sure the crimp terminals for wiring are of the specified size.
11.Do not connect anything to terminals that are not being used.
12.Use a power supply that will reach the rated voltage within 1
second after the power is turned ON.
13.After you turn ON the power, it takes 2 seconds for the outputs of
the Temperature Monitoring Relay to stabilize. Take this time into
account when you design the control panel.
14.Allow at least 30 minutes for the product to warm up. During this
time, the temperature measurements will be incorrect.
15.Keep wiring separate from high voltages and power lines that
draw large currents.
Do not place product wiring in parallel with or in the same path as
high-voltage or high-current lines.
16.Do not install the product near equipment that generates high
frequencies or surges.
17.The product may cause incoming radio wave interference. Do not
use the product near radio wave receivers.
18.Install an external switch or circuit breaker and label it clearly so
that the operator can quickly turn OFF the power supply.
19.When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.
20.When discarding the product, properly dispose of it as industrial
waste.
21.Make sure the power and output indicators operate correctly.
Depending on the application environment, the indicators and
other plastic parts may wear prematurely and become difficult to
see. Check and replace these parts regularly.
22.The terminal blocks may heat up to 65°C. Use care when
handling them.
Observe the following operating
methods to prevent failure and
malfunction.
1. Use the power supply voltage, input power, and other power
supplies and converters with suitable capacities and rated
outputs.
2. Use a precision screwdriver or similar tool to adjust the rotary
switches.
Mounting and Removing
•Mounting to DIN Track
1. Catch the upper hook on the DIN Track.
2. Push the product onto the Track until the hooks lock into place.
•Removing from the DIN Track
Pull down on the bottom hook with a flat-blade screwdriver and lift
up on the product.
Precautions for Safe Use Precautions for Correct Use
AB
PFP-100N (100 cm)
PFP-50N (50 cm)
Applicable DIN Tracks:
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