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Single-phase Overvoltage/Undervoltage Relay
K8DT-VW
Detect abnormal voltages applies to equipment to
protect against equipment failure.
Monitor for overvoltages and undervoltages
simultaneously with one Relay.
• Monitor AC or DC voltages with one Relay.
• Settings for the operating value, hysteresis, and operating time.
• Width of 17.5 mm to reduce space required in panels.
• Push-In Plus Terminal that reduce wiring work.
The use of cage clamps enables wiring with bare stranded wires.
Double-insertion holes for crossover wiring (all terminals).
• UL listed for easy shipping to North America.
• Models added with transistor outputs for superior contact reliability.
Refer to Safety Precautions on page 8.
Refer to page 7 for commonly asked questions.
For the most recent information on models
that have been certified for safety
standards, refer to your OMRON website.
Ordering Information
Single-phase Overvoltage/Undervoltage Relay
Setting range
Power supply voltage
1 to 10 V AC/DC
3 to 30 V AC/DC
15 to 150 V AC/DC
20 to 200 V AC/DC
30 to 300 V AC/DC
60 to 600 V AC/DC
Output
Model
Relay: SPDT contact output
K8DT-VW2CD
Transistor: NPN output
K8DT-VW2TD
Relay: SPDT contact output
K8DT-VW2CA
24 VAC/DC
100 to 240 VAC
Transistor: NPN output
K8DT-VW2TA
Relay: SPDT contact output
K8DT-VW3CD
24 VAC/DC
Transistor: NPN output
K8DT-VW3TD
Relay: SPDT contact output
K8DT-VW3CA
Transistor: NPN output
K8DT-VW3TA
100 to 240 VAC
Options (Order Separately)
Front Cover
Appearance
Model
Y92A-D1A
Ratings and Specifications
Input Range
Model
K8AK-VW2@@
K8AK-VW3@@
Range *
Connection terminal
Setting range
Input impedance
0 to 10 V AC/DC
V1-COM
1 to 10 V AC/DC
Approx. 120 kΩ
0 to 30 V AC/DC
V2-COM
3 to 30 V AC/DC
Approx. 320 kΩ
0 to 150 V AC/DC
V3-COM
15 to 150 V AC/DC
Approx. 1.6 MΩ
0 to 200 V AC/DC
V1-COM
20 to 200 V AC/DC
Approx. 1.2 MΩ
0 to 300 V AC/DC
V2-COM
30 to 300 V AC/DC
Approx. 1.7 MΩ
0 to 600 V AC/DC
V3-COM
60 to 600 V AC/DC
Approx. 3.1 MΩ
Overload capacity
Continuous input at 115% of
maximum input.
10 s at 125%
(up to 600 VAC)
* The range is selected using connected terminals.
1
K8DT-VW
Ratings
2
Specifications
Power supply
voltage
K8DT-VW@@D: 24 VAC 50/60 Hz, 24 VDC
K8DT-VW@@A: 100 to 240 VAC 50/60 Hz
Allowable operating
voltage range
85% to 110% of rated power supply voltage
Power consumption
24 VAC/DC: 1.8 VA/1 W max.
100 to 240 VAC: 2.5 VA max.
Allowable operating
frequency range
50/60 Hz ±5 Hz
Rated insulation
voltage
600 VAC
Input frequency range
40 to 500 Hz
Overload capacity
Continuous input at 115% of maximum input, 10
s at 125% (up to 600 VAC).
Operating value setting
range (AL1 and AL2)
10% to 100% of the maximum value of the setting
range
K8DT-VW2: 1 to 10 V AC/DC
3 to 30 V AC/DC
15 to 150 V AC/DC
K8DT-VW3: 20 to 200 V AC/DC
30 to 300 V AC/DC
60 to 600 V AC/DC
Operating value
100% operation at set value
Reset value
5% of operating value (fixed)
Reset method
Manual reset/automatic reset (switchable)
Manual reset: Turn OFF power supply for 1 s or
longer.
Operating time
setting range (T)
0.1 to 30 s
Power ON lock time
1 s or 5 s (Switched using DIP switch.)
Indicators
Power (PWR): Green, Relay output (RY): Yellow,
Alarm output1 (AL1): Red,
Alarm output2 (AL2): Red
Input impedance
Refer to Input Range on page 1.
Output form
Relay: SPDT contact output
Transistor: NPN output
Output relay ratings
Rated load
5 A at 250 VAC (Resistive load)
5 A at 30 VDC (Resistive load)
1 A at 250 VAC (Inductive load)
0.2 A at 48 VDC (Inductive load)
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 or 30 VDC: 100,000
operations
Transistor output
ratings
Contact form: SPST-NO (NPN transistor)
Rated voltage: 24 VDC (maximum voltage: 26.4 VDC)
Maximum current: 50 mA DC
Ambient operating
temperature
−20 to 60°C (with no condensation or icing)
Storage temperature
−25 to 65°C (with no condensation or icing)
Ambient operating
humidity
25% to 85% RH (with no condensation)
Storage humidity
25% to 85% RH (with no condensation)
Altitude
2,000 m max.
Applicable wires
Stranded wires, solid wires, or ferrules
Applicable wire size
0.25 to 1.5 mm2 (AWG24 to AWG16)
Wire insertion force
8 N max. for AWG20 wire
Screwdriver
insertion force
15 N max.
Wire stripping length
8 mm
Ferrule length
8 mm
Recommended flatblade screwdriver
XW4Z-00B (Omron)
SZF 0.4 × 2.5 (Phoenix Contact)
210-719 (Wago)
SDI 0.4 × 2.5 × 75 (Weidmuller)
Current capacity
10 A (per pole)
Number of insertions
50 times
Case color
N1.5
Case material
PC, UL 94 V-0
Weight
Approx. 100 g
Mounting
Mounts to DIN Track, or screw mounting
Dimensions
17.5 × 90 × 90 mm (W×H×D)
Repeat
accuracy
Applicable
standards
Operating
value
±0.5% full scale (at 25°C and 65% humidity, rated
power supply voltage)
Operating
time
±50 ms (at 25°C and 65% humidity, rated power
supply voltage)
Conforming
standards
EN 60947-5-1
Installation environment (pollution level 2,
Overvoltage category III)
EMC
EN 60947-5-1
Safety
UL 60947-5-1 (Listing), Korean Radio Waves Act
standards (Act 10564), CCC (GB14048.5)
Insulation resistance
20 MΩ min.
Between all external terminals and the case
Between all power supply terminals and all
input terminals
Between all power supply terminals and all
output terminals
Between all input terminals and all output
terminals
Dielectric strength
2,000 VAC for 1 min
Between all external terminals and the case
Between all power supply terminals and all
input terminals
Between all power supply terminals and all
output terminals
Between all input terminals and all output
terminals
Impulse withstand
voltage
6 kV (between live terminals and exposed,
non-charged metal parts)
Noise immunity
Square-wave noise of 1 μs/100-ns pulse width
with 1-ns rise time
100 to 240 VAC: 1,500 V power supply terminal
common/normal mode
24 VAC: 1,500 V power supply terminal common/
normal mode
24 VDC: 480 V power supply terminal common
Vibration resistance
Frequency: 10 to 55 Hz, 0.35-mm single
amplitude, acceleration 50 m/s2
10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance
100 m/s2, 3 times each in 6 directions along 3
axes
Degree of protection
Terminals: IP20
K8DT-VW
Connections
Terminal Diagram
K8DT-VW2 C A
(3) Power Supply Voltage
(1) (2)(3)
A: 100 to 240 VAC
(1) Voltage Input
VW3
VW2
150V max.
600V max.
30V max.
300V max.
10V max.
200V max.
V1
V1
V2
C
V3
V2
C
A1
A2
V1
C
V2
V3
A1
A2
D: 24 VAC/DC
A1
A2
(No polarity)
(2) Output
DIP SW
C: Relay Output
12
V3
14
11
T: Transistor Output
12
14
11
14
11
Inside
Inside
Note: 1.
2.
3.
4.
Do not connect anything to terminals that are shaded in gray.
There is no polarity for the DC power supply input.
For the voltage input, you can input only from the C terminal and one other terminal.
Refer to Setting Ranges and Wiring Connections for information on the V1, V2, and V3 voltage input terminals.
Wiring Example
Relay Output
Single-phase
power supply
Load
Power A2
supply A1
voltage
A1 A2
V1 C
V2 V3
Power supply
AC/DC
DIP SW
12
14 11
Transistor Output
Single-phase
power supply
Load
Power
A2
supply voltage A1
A1 A2
V1 C
V2 V3
Power
supply
AC/DC
DIP SW
14 11
PLC
Note: Use copper wires with a rating of 75°C or an equivalent rating.
3
K8DT-VW
Timing Charts
Overvoltage and Undervoltage Operation Diagram
Undervoltage and Undervoltage Operation Diagram
DIP switch settings: SW3 and SW4 both ON or both OFF.
DIP switch settings: SW3 OFF and SW4 ON.
Power supply voltage
Power supply voltage
Overvoltage set value
(AL1)
Delay time: 250 ms
(reference value)
Input
Undervoltage set value
(AL2)
AL1 alarm indicator
Flashing
Flashing
AL2 alarm indicator
Contacts 11-14 or
transistor output
t
t1
t
Lit
Hysteresis: Fixed at 5%
Undervoltage set value
(AL1)
Hysteresis: Fixed at 5%
Undervoltage set value
(AL2)
Input
Hysteresis: Fixed at 5%
Delay time: 250 ms
(reference value)
Lit
t: Operating time (0.1 to 30 s)
Hysteresis: Fixed at 5%
Flashing
AL1 alarm indicator
Lit
Flashing
AL2 alarm indicator
t
t1: Power ON lock (1 s or 5 s)
Note: 1. The K8DT-VW@ output is normally operative.
2. The power ON lock prevents unnecessary alarms from being
generated during the instable period when the power is first
turned on. There is no relay output during timer operation.
Overvoltage and Overvoltage Operation Diagram
Lit
t
Contacts 11-14 or
transistor output
t: Operating time (0.1 to 30 s)
Delay time: 250 ms
(reference value)
Delay time: 250 ms
(reference value)
t1
t: Operating time (0.1 to 30 s)
t1: Power ON lock (1 s or 5 s)
Note: 1. The K8DT-VW@ output is normally operative.
2. The power ON lock prevents unnecessary alarms from being
generated during the instable period when the power is first
turned on. There is no relay output during timer operation.
DIP switch settings: SW3 ON and SW4 OFF.
Power supply voltage
Overvoltage setting
(AL1)
Hysteresis: Fixed at 5%
Overvoltage setting
(AL2)
Delay time: 250 ms
(reference value)
Input
Flashing
AL1 alarm indicator
Flashing
AL2 alarm indicator
Hysteresis: Fixed at 5%
Delay time: 250 ms
(reference value)
Lit
Lit
Contacts 11-14 or
transistor output
t
t: Operating time (0.1 to 30 s)
t1
t
t1: Power ON lock (1 s or 5 s)
Note: 1. The K8DT-VW@ output is normally operative.
2. The power ON lock prevents unnecessary alarms from being
generated during the instable period when the power is first
turned on. There is no relay output during timer operation.
Nomenclature
Front
Indicators
Item
Terminal block
(See note.)
Power indicator
Voltage knob (AL1)
Lit when power is being supplied.
Output status indicator
(Output: Yellow)
Lights for output (lit for normal operation)
Alarm indicators
(AL1 and AL2: Red)
Lit when there is an overvoltage or
undervoltage.
The indicator flashes to indicate the error
status after the input has exceeded the set
value while the operating time is being
clocked.
Output status indicator
Voltage knob (AL2)
Alarm indicator
Meaning
Power indicator
(PWR: Green)
Setting Knobs
Operating time knob (T)
Terminal block
(See note.)
Note: Use solid wires, stranded wires, or ferrules to connect to the
terminals.
To maintain the withstand voltage after connecting the terminals,
insert 8 mm of exposed conductor into the terminal.
Solid Wire
8 mm
4
Stranded Wires
8 mm
Ferrules
8 mm
Item
Usage
Voltage knob (AL1)
Used to set the voltage to 10% to 100% of
maximum setting range.
Voltage knob (AL2)
Used to set the voltage to 10% to 100% of
maximum setting range.
Operating time knob (T)
Used to set the operating time to 0.1 to 30 s.
K8DT-VW
Operation Methods
Setting Ranges and Wiring Connections
Model
Setting range
K8DT-VW2
K8DT-VW3
Wiring connection
1 to 10 V AC/DC
V1-COM
3 to 30 V AC/DC
V2-COM
15 to 150 V AC/DC
V3-COM
20 to 200 V AC/DC
V1-COM
30 to 300 V AC/DC
V2-COM
60 to 600 V AC/DC
V3-COM
Connections
Input
Single-phase power
Connect the input between terminals V1-COM, V2-COM, or V3-COM, depending on the input
voltage.
Malfunctions may occur if the input is connected to unused terminals and the Unit will not operate
correctly.
A1
Power Supply
Power supply
voltage
Connect the power supply to terminals A1 and A2.
A2
Outputs
V1
For a relay output, the SPDT contacts are output on terminals 11, 12, and 14. For a transistor output,
the NPN output is on terminals 11 and 14.
Do not use the transistor output for control applications. It is designed only to output a signal when
an error is detected.
Voltage input
V2 C(COM)
V3
14
11
Contact output
12
or
Signal output
11
14
Load
DIP Switch Settings
The power ON lock time, resetting method and operating mode are set using the DIP switch located on the front of the Unit.
Note: Open the DIP switch cover to set the DIP switch.
Keep the DIP switch cover closed while the power supply to the Relay is ON.
DIP Switch Functions
O
N
ON ❍ ↑
OFF ● ↓
4
3
2
1
Pin
SW4
SW3
SW2
SW1
DIP Switch Functions
ON
1
2
3
4
---
OFF
Power ON lock
time
5s
❍
---
---
1s
●
---
---
---
Resetting
method
Operating mode
---
❍
---
---
Manual reset
---
●
---
---
AL1
AL2
Overvoltage
Undervoltage
---
---
❍
❍
UnderOperating mode voltage
Undervoltage
---
---
●
❍
Overvoltage
Overvoltage
---
---
❍
●
Overvoltage
Undervoltage
---
---
●
●
Note: All pins are set to OFF at the factory.
5
K8DT-VW
Setting Method
Setting Voltage
Operating Time
The voltage knob (AL1 and AL2) is used to set the voltage.
The voltage can be set to 10% to 100% of the maximum setting
range.
Turn the knob while there is an input to the input terminals until the
alarm indicator flashes (when the set value and the input have
reached the same level.)
Use this as a guide to set the voltage.
The maximum setting range will differ depending on the model and
the input terminal.
Example: K8DT-VW3 Using Input Terminal V3-COM
The maximum setting range will be 600 VAC/VDC and the setting
range will be 60 to 600 V.
The operating time is set using the operating time knob (T).
The operating time can be set to between 0.1 and 30 s.
If the input exceeds (or drops lower than) the voltage set value, the
alarm indicator will start flashing for the set period and then stay lit.
Dimensions
(Unit: mm)
Single-phase Overvoltage/Undervoltage Relays
K8DT-VW2
K8DT-VW3
100
90
86
17.5
5
90
Options (Order Separately)
Front Cover
Y92A-D1A
1.8
52.7
3.5
17.5
5.85
Optional Parts for DIN Track Mounting
DIN Tracks
PFP-100N
PFP-50N
7.3±0.15
4.5
35±0.3
15
25
10
25
25
1000(500) *
10
25
15(5)*
27±0.15
1
* Dimensions in parentheses are for the PFP-50N.
6
K8DT-VW
Questions and Answers
Q
Q
Checking Operation
Overvoltages
Gradually increase the input from 80% of the set value.
The input will equal the operating value when the input
exceeds the set value and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will start
after the operating time has passed.
Undervoltage
Gradually decrease the input from 120% of the set value and
check the operation using the same method as for
overvoltage.
How to Measure the Operating Time
Overvoltage
Change the input suddenly from 0% to 120% of the set value
and measure the time until the Unit operates.
Undervoltage
Change the input suddenly from 120% to 0% of the set value
and measure the time until the Unit operates.
Example: Overvoltage Operating Mode, Undervoltage Operating
Mode and an Operating Time of 5 s
Note: K8DT-VW@ output relays are normally operative.
Set value
Input voltage
Flashing
Lit
Alarm indicator
5s
Contact output or
transistor output
Connection Diagram
200 VAC
V 0 to 300 V
Variable
autotransformer
±
Input terminals
Power supply
A1
A2
C 200 V
Cycle counter
7
K8DT-VW
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
WARNING
Indicates a potentially hazardous
situation which, if not avoided, will result
in minor or moderate injury, or may result
in serious injury or death. Additionally,
there may be significant property
damage.
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.
!WARNING
Electrical shock may occasionally cause serious injury. Confirm
that the input voltage is OFF before starting any wiring work and
wire all connections correctly.
!CAUTION
Doing so may occasionally result in minor injury due
to electric shock. Do not touch the Relay while the
power supply is ON, except for the adjustment knob.
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.
Meaning of Product Safety Symbols
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.
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.
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.
If the Relay is used with incorrect wiring, fire may
occasionally occur, possibly resulting in physical
damage. Check the wiring for mistakes before you
turn ON the power supply.
If the 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 Relay
regularly. To maintain safety in the event of
malfunction of the Relay, take appropriate safety
measures, such as installing a monitoring device on a
separate line.
If the wire insertion length is insufficient, fire may
occasionally occur, possibly resulting in physical
damage. Insert the wires all the way to the back.
The terminal block may be damaged if you insert a
flat-blade screwdriver in the release hole with
excessive force. Insert the flat-blade screwdriver into
the release holes with a force of 15 N or less.
8
K8DT-VW
Precautions for Safe Use
30.To prevent wire materials from smoking or igniting, use the wiring
materials given in the following table.
1. Do not use or store the product in the following locations.
• Locations subject to water or oil
Stripping length
Recommended wire
Without
Ferrules
With Ferrules
• Outdoor locations or under direct sunlight
• Locations subject to dust or corrosive gases (sulfurizing gases,
ammonia gases, etc.)
• Locations subject to rapid temperature changes
• Locations prone to icing and dew condensation
• Locations subject to vibration and large shocks
0.25 to 1.5mm2/Equivalent to AWG24 to 16
10 mm
8 mm
Note: Please use Ferrules with UL certification (R/C).
31.Use only the specified wires for wiring.
32.When wiring the terminals, allow some leeway in the wire length.
33.Make sure that the power supply is turned OFF before you change
any DIP switch setting.
• Locations subject to wind and rain
Precautions for Correct Use
• Locations subject to static electricity or noise
• Locations subject to insects or small animals
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. Check terminal polarity when wiring and wire all connections
correctly. The power supply terminals do not have polarity.
4. Do not wire the input and output terminals incorrectly.
5. Make sure the power supply voltage and loads are within the
specifications and ratings for the product.
6. Make sure the ferrule terminals for wiring are of the specified size.
7. The stripping length is 8 mm. Insert the wires all the way to the
back.
8. Do not connect anything to terminals that are not being used.
9. Use a power supply that will reach the rated voltage within 1
second after the power is turned ON.
10.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.
11.Do not install the product near equipment that generates high
frequencies or surges.
12.The product may cause incoming radio wave interference. Do not
use the product near radio wave receivers.
13.Install an external switch or circuit breaker and label it clearly so
that the operator can quickly turn OFF the power supply.
14.Make sure the indicators operate correctly. Depending on the
application environment, the indicators may deteriorate
prematurely and become difficult to see.
15.Do not use the product if it is accidentally dropped. The internal
components may be damaged.
16.Be sure you understand the contents of this catalog and handle
the product according to the instructions provided.
17.Do not install the product in any way that would place a load on it.
18.When discarding the product, properly dispose of it as industrial
waste.
19.When using the product, remember that the power supply
terminals carry a high voltage.
20.The product must be handled only by trained electrician.
21.Prior to operation, check the wiring before you supply power to the
product.
22.Do not install the product immediately next to heat sources.
23.Perform periodic maintenance.
24.Do not wire anything to the release holes.
25.Do not tilt or twist a flat-blade screwdriver while it is inserted into a
release hole on the terminal block. The terminal block may be
damaged.
26.Insert a flat-blade screwdriver into the release holes at an angle.
The terminal block may be damaged if the screwdriver is inserted
straight in.
27.Do not allow the flat-blade screwdriver to fall when you are holding
it in a release hole.
28.Do not bend a wire past its natural bending radius or pull in it with
excessive force. Doing so may break the wires.
29.Do not insert more than one wire into each terminal insertion hole.
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. Do not use the Relay in circuits with waveform distortion. Error will
be large due to waveform distortion.
3. Error will be large if the product is used for thyristor or inverter
control.
4. When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.
5. If you use stranded wires, make sure that there are no loose wire
strands.
6. If you wire crossovers and connect terminal blocks in parallel, a
large current will flow. Make sure that the current does not exceed
10 A.
7. The terminal block may be damaged if the recommended tool is
not used. Use the recommended flat-blade screwdriver to operate
the release holes.
Correct Mounting Direction, Mounting, and
Removing
Mounting to DIN Track
To mount the Relay to a DIN Track, hook the Relay onto the DIN
Track and press the Relay in the direction of the arrow until you hear
it lock into place.
(1)
(2)
Removing from the DIN Track
To remove the Relay, insert a screwdriver into the hook on the top or
bottom and pull out the hook to release the Relay.
Applicable DIN Tracks
PFP-100N (100 cm)
PFP-50N (50 cm)
30 mm min.
• Leave at least 30 mm of space between the product and other
devices to allow easy installation and removal.
9
K8DT-VW
Screw Mounting
Connecting Stranded Wires
1. Pull out the two hooks on the back of the Relay to the outside until
you hear them click in place.
2. Insert M3 screws into the hook holes and secure the Relay.
Use the following procedure to connect the wires to the terminal block.
1. Hold a flat-blade screwdriver at an angle and insert it into the
release hole. The angle should be between 10° and 15°.
If the flat-blade screwdriver is inserted correctly, you will feel the
spring in the release hole respond.
2. With the flat-blade screwdriver still inserted into the release hole,
insert the wire into the terminal hole until it strikes the terminal block.
3. Remove the flat-blade screwdriver from the release hole.
Mounting Hole Dimensions
(1)
Two M3 screw holes or
two 3-dia. holes
(2)
<Lower side>
<Upper side>
108
Flat-blade screwdriver
(2)
(1)
Note: 1. Pull out the hooks to mount
the Relay with screws.
2. Recommended tightening
torque: 0.5 to 0.6 N·m.
(2)
(3)
(1)
Wire
Wire
(2)
(3)
(1)
Flat-blade screwdriver
Adjusting the Setting Knobs
10 to 15°
• Use a flat-blade screwdriver to adjust the setting knobs. The knobs
have a stopper that prevents them from turning beyond the full right
or left position. Do not force a knob beyond these points.
Flat-blade
screwdriver
Flat-blade
screwdriver
10 to 15°
Checking Connections
• After the insertion, pull gently on the wire to make sure that it will
not come off and the wire is securely fastened to the terminal block.
• To prevent short circuits, insert the stripped part of a stranded or
solid wire or the conductor part of a ferrule until it is hidden inside
the terminal insertion hole. (See the following diagram.)
Setting knob
<Upper side>
• To reduce the error in the setting knob, always turn the setting knob
from the minimum setting toward the maximum setting.
<Upper side>
<Lower side>
<Lower side>
Wire
Ferrule
Connecting Wires to the Push-In Plus Terminal Block
Part Names of the Terminal Block
Ferrule
<Lower side>
<Upper side>
Terminal
(Insertion) hole
Removing Wires from the Push-In Plus Terminal Block
Release hole
Release hole
Terminal
(Insertion) hole
Connecting Wires with Ferrules and Solid Wires
Insert the solid wire or ferrule straight into the terminal block until the
end strikes the terminal block.
Use the following procedure to remove wires from the terminal block.
The same method is used to remove stranded wires, solid wires, and
ferrules.
1. Hold a flat-blade screwdriver at an angle and insert it into the
release hole.
2. With the screwdriver still inserted into the release hole, remove the
wire from the terminal insertion hole.
3. Remove the flat-blade screwdriver from the release hole.
<Lower side>
<Upper side>
Flat-blade screwdriver
<Lower side>
<Upper side>
Terminal
(Insertion) hole
Ferrule
Wire
(2)
(3)
(1)
Wire
Release hole
Wire
(2)
(3)
Release hole
Ferrule
Terminal
(Insertion) hole
If a wire is difficult to connect because it is too thin, use a flat-blade
screwdriver in the same way as when connecting stranded wire.
(1)
Flat-blade screwdriver
10 to 15°
Flat-blade
screwdriver
Flat-blade
screwdriver
10 to 15°
10
K8DT-VW
Recommended Ferrules and Tools
EN/IEC Standard Compliance
Recommended ferrules
Wire
(mm2)
(AWG)
0.25
Recommended ferrules
Ferrule
length
(mm)
24
Manufactured Manufactured
Manufactured
by Phoenix
by
by Wago
Contact
Weidmuller
8 AI0.25-8
H0.25/12
FE-0.25-8N-YE
0.34
22
8 AI0.34-8
H0.34/12
FE-0.34-8N-TQ
0.5
20
8 AI0.5-8
H0.5/14
FE-0.5-8N-WH
0.75
18
8 AI0.75-8
H0.75/14
FE-0.75-8N-GY
1
18
8 AI1-8
H1.0/14
FE-1.0-8N-RD
1.5
16
8 AI1.5-8
H1.5/14
FE-1.5-8N-BK
PZ6 roto
Variocrimp4
CRIMPFOX6
CRIMPFOX6T-F
CRIMPFOX10S
Recommended crimp tool
Note: 1. Make sure that the outer diameter of the wire coating is
smaller than the inner diameter of the insulation sleeve of
the recommended ferrule.
2. Make sure that the ferrule processing dimensions conform
to the following figures.
8 mm
2.1 mm max.
• Refer to the contents of this datasheet for cable selection and other
conditions for compliance with EMC standards.
Precaution on EN Standard Compliance
The K8DT complies with EN 60947-5-1 when it is built into a panel,
but observe the following handling methods to ensure compliance
with the requirements of this standard.
Wiring
Overvoltage category III
Pollution degree 2
• Open-frame Device
• If basic, double, or reinforced insulation is required, use the basic,
double, or reinforced insulation defined in IEC 60664 that is
suitable for the maximum applied voltage for the clearance, solid
insulation, and other factors.
• There is basic insulation between the power supply terminals and
input terminals.
• There is basic insulation between the power supply terminals and
output terminals.
• There is basic insulation between the input terminals and output
terminals.
• Operating section must have reinforced or double insulation.
• The sides of the case are not isolated.
• Connect the output contacts (contacts with different polarity) so
that they reach the same potential.
2.7 mm max.
Recommended Flat-blade Screwdriver
Use a flat-blade screwdriver to connect and remove wires.
Use the flat-blade screwdriver.
The following table shows manufacturers and models as of 2015/Dec.
Side
Front
Not isolated
2.5 mm dia.
0.4 mm
Reinforced insulation
(Double insulation)
2.5 mm
Model
XW4Z-00B
Manufacturer
Omron
ESD0.40✕2.5
Wera
SZF 0.4✕2.5
Phoenix Contact
0.4✕2.5✕75 302
Wiha
AEF.2.5✕75
Facom
210-719
Wago
SDI 0.4✕2.5✕75
Weidmuller
11
MEMO
12
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have
any questions or comments.
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NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
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Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
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Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice
to change part numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be
assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to
confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
OMRON Corporation
Industrial Automation Company
Authorized Distributor:
Kyoto, JAPAN
Contact: www.ia.omron.com
Regional Headquarters
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PuDong New Area, Shanghai, 200120, China
Tel: (86) 21-5037-2222/Fax: (86) 21-5037-2200
© OMRON Corporation 2016 All Rights Reserved.
In the interest of product improvement,
specifications are subject to change without notice.
CSM_1_1_0316
Cat. No. N204-E1-01
0316 (0316)
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