Omron K8AB-VW Series User manual

Cat. No. N144-E1-01 Single-phase Voltage Relay K8AB-VW 1
Single-phase Voltage Relay
K8AB-VW
Ideal for voltage monitoring for industrial
facilities and equipment.
• Monitor for overvoltages and undervoltages simultaneously.
Separate settings and outputs supported for overvoltages and
undervoltages.
• Manual resetting and automatically resetting supported by one
Relay.
• Pre-alarm Mode (H/HH and L/LL operating modes)
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
• Process control signal (0 to 10 V) and current splitter input
supported.
• Relay warning status easily monitoring using LED indicator.
• Input frequency of 40 to 500 Hz supported.
• Easy wiring with ferrules
2 ×2.5 mm2solid or 2 ×1.5 mm2standard ferrules.
• CE mark compliance certified by third party.
UL certification pending.
Model Number Structure
■Model Number Legend
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
VW: Single-phase Voltage Relay (Simultaneous upper and lower limit monitoring)
3. Measuring Tension
1: 6 to 60 mV AC/DC, 10 to 100 mV AC/DC, 30 to 300 mV AC/DC
2: 1 to 10 V AC/DC, 3 to 30 V AC/DC, 15 to 150 V AC/DC
3: 20 to 200 V AC/DC, 30 to 300 V AC/DC, 60 to 600 V AC/DC
4. Supply Voltage
24 VDC: 24 VDC
24 VAC: 24 VAC
100-115 VAC: 100 to 115 VAC
200-230 VAC: 200 to 230 VAC
123 4
K8AB-@@

2Single-phase Voltage Relay K8AB-VW Cat. No. N144-E1-01
Ordering Information
■List of Models
Note: The rated input depends on the connected terminals. Select the terminals suitable for the inputs, and connect the inputs to V1-COM, V2-
COM, and V3-COM.
Ratings and Specifications
■Ratings
Single-phase Voltage Relay Measuring voltage
(See note.)
Supply voltage Model
6 to 60 mV AC/DC,
10 to 100 mV AC/DC,
30 to 300 mV AC/DC
24 VDC K8AB-VW1 24 VDC
24 VAC K8AB-VW1 24 VAC
100-115 VAC K8AB-VW1 100-115 VAC
200-230 VAC K8AB-VW1 200-230 VAC
1 to 10 V AC/DC,
3 to 30 V AC/DC,
15 to 150 V AC/DC
24 VDC K8AB-VW2 24 VDC
24 VAC K8AB-VW2 24 VAC
100-115 VAC K8AB-VW2 100-115 VAC
200-230 VAC K8AB-VW2 200-230 VAC
20 to 200 V AC/DC,
30 to 300 V AC/DC,
60 to 600 V AC/DC
24 VDC K8AB-VW3 24 VDC
24 VAC K8AB-VW3 24 VAC
100-115 VAC K8AB-VW3 100-115 VAC
200-230 VAC K8AB-VW3 200-230 VAC
Operating
power
Non-isolated power supply 24 VDC (1 W)
Isolated power supply 24 VAC (4 VA), 100 to 115 VAC (4 VA), 200 to 230 VAC (5 VA)
Operation
(AL1 and
AL2)
Operating value setting
range
10% to 100% of maximum rated input value
Operating value 100% operation at set value
Reset (HYS.) Hysteresis 5% of operating value (fixed)
Resetting method Manual reset/automatic reset (switchable)
Manual reset: Turn OFF operating power for 1 s or longer.
Operating time (T) 0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)
Power ON lock (LOCK) 1 s or 5 s error ±0.5 s (Value when input rapidly changes from 0% to 100%. The operating time is
the shortest at this point.)
Setting accuracy ±10% of full scale
Time error ±10% of set value (Minimum error: 50 ms)
Input frequency 40 to 500 Hz
Input impedance K8AB-VW1: 9 kΩmin.
K8AB-VW2: 100 kΩmin.
K8AB-VW3: 1 MΩmin.
Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM1/2): Red LED
Output relays Two SPDT relays (6 A at 250 VAC, resistive load), Normally closed operation (normally ON)
(separate outputs possible for overvoltages and undervoltages)

Cat. No. N144-E1-01 Single-phase Voltage Relay K8AB-VW 3
■Specifications
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature −40 to 70°C (with no condensation or icing)
Ambient operating humidity 25% to 85%
Storage humidity 25% to 85%
Altitude 2,000 m max.
Operating voltage range 85% to 110% of rated operating voltage
Rated power supply frequency 50/60 Hz ±5 Hz (AC power supply)
Output relays Resistive load 6 A at 250 VAC (cos φ = 1)
6 A at 30 VDC (L/R = 0 ms)
Inductive load 1 A at 250 VAC (cos φ = 0.4)
1 A at 30 VDC (L/R = 7 ms)
Minimum load 10 mA at 5 VDC
Maximum contact voltage 250 VAC
Maximum contact current 6 A AC
Maximum switching
capacity
1,500 VA
Mechanical life 10,000,000 operations
Electrical life Make: 50,000 times, Break: 30,000 times
Terminal screw tightening torque 1.2 N·m
Crimp terminals Two solid wires of 2.5 mm2, two crimp terminals of 1.5 mm2with insulation sleeves, can be
tightened together
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)
Degree of protection Terminal section: IP20, Rear case: IP40
Case color Munsell 5Y8/1 (ivory)
Case material ABS resin (self-extinguishing resin) UL94-V0
Weight 200 g
Mounting Mounted to DIN Track or via M4 screws
Dimensions 22.5 (W) x 90 (H) x 100 (D) mm
Installation environment Overvoltage Category III, Pollution Degree 2
Application standards EN60255-5/-6
Safety standards EN60664-1
EMC EMI: EN61326 Industrial applications
Electromagnetic interference wave
CISPR11 Group 1, Class A: CISPR16-1/-2
Terminal interference wave voltage
CISPR11 Group 1, Class A: CISPR16-1/-2
EMS: EN61326 Industrial applications
Electrostatic discharge EN61000-4-2: 8 kV (in air)
Radiating radio-frequency electromagnetic field EN61000-4-3:
10 V/m 1 kHz sine wave amplitude modulation (80 MHz to 1 GHz)
Burst EN61000-4-4: 1 kV (I/O signal line), 2 kV (power line)
Surge EN61000-4-5: 1 kV with line (power line),
2 kV with ground (power line)
Conducted RF EN61000-4-6: 3 V (0.15 to 80 MHz)
Power frequency magnetic field immunity
EN61000-4-8: 30 A/m
Voltage dip/short interruptions
EN61000-4-11: 0.5 cycle, 0.180° each, polarity 100% (rated voltage)

4Single-phase Voltage Relay K8AB-VW Cat. No. N144-E1-01
Connections
■Wiring Diagram
Overvoltage and Undervoltage
Operation Diagram
Note: 1. The K8AB-VW output relay 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 Undervoltage
Operation Diagram (Overvoltage Pre-
alarm Mode)
Note: 1. The K8AB-VW output relay 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 Undervoltage
Operation Diagram (Undervoltage Pre-
alarm Mode)
Note: 1. The K8AB-VW output relay 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.
T
T1
T
AL1 alarm indicator
Overvoltage (AL1) relay
Voltage input value
Undervoltage (AL2) relay
Overvoltage setting (AL1)
Undervoltage set value (AL2)
Hysteresis: Fixed at 5%
Flashing Lit
Flashing Lit
Hysteresis: Fixed at 5%
Control power
T: Operating time (0.1 to 30 s)
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
T: Operating time (0.1 to 30 s)
Output
Output
COM
A1
A2
V1
V2
V3
14
12
24
22
11
21
Single-phase power
Operating
power
Input
Load
AL1
AL2
T1
AL1 alarm indicator
Overvoltage (AL1) relay
Voltage input value
Undervoltage (Al2) relay
Overvoltage setting (AL1)
Hysteresis: Fixed at 5%
Lit
Flashing
Hysteresis: Fixed at 5%
Control power
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
Overvoltage setting (AL2)
Flashing Lit
Model Measuring range Connection
K8AB-VW1 6 to 60 mV AC/DC V1-COM
10 to 100 mV AC/DC V2-COM
30 to 300 mV AC/DC V3-COM
K8AB-VW2 1 to 10 V AC/DC V1-COM
3 to 30 V AC/DC V2-COM
15 to 150 V AC/DC V3-COM
K8AB-VW3 20 to 200 V AC/DC V1-COM
30 to 300 V AC/DC V2-COM
60 to 600 V AC/DC V3-COM
T1
AL1 alarm indicator
Voltage input value
Undervoltage (AL2) relay
Undervoltage set value (AL2)
Hysteresis: Fixed at 5%
Flashing
Lit
Hysteresis: Fixed at 5%
Control power
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
Undervoltage set value (AL1)
Undervoltage (AL1) relay
Flashing Lit

Cat. No. N144-E1-01 Single-phase Voltage Relay K8AB-VW 5
Nomenclature
■Front Indicators
Setting Knobs
■Function Selection DIP Switch DIP Switch Functions
Dimensions
Power indicator
Relay status indicator
Voltage knob (AL1)
Voltage knob (AL2)
Operating time knob (T)
Alarm indicator
Item Meaning
Power indicator
(PWR: Green)
Lit when power is being supplied.
Relay status
indicator
(RY: Yellow)
Lit when relay operates (Not light when both
AL1 and AL2 are in error status) (Normally lit)
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
threshold value while the operating time is
being clocked.
Item Usage
Voltage knob (AL1) Used to set the voltage to 10% to 100%
of maximum rated input voltage.
Voltage knob (AL2) Used to set the voltage to 10% to 100%
of maximum rated input voltage.
Operating time knob (T) Used to set the operating time to 0.1 to
30 s.
ON
SW2
DIP Switch
SW3
SW4
SW1
Function Default
SW1 Operating power ON lock
time
OFF 1 s OFF
ON 5 s
SW2 Resetting method OFF Manual reset OFF
ON Automatic
reset
SW3 SW4 Function Default
SW3 SW4
OFF OFF Operating
mode
AL1: Overvoltage,
AL2: Undervoltage
OFF OFF
ON OFF AL1: Overvoltage,
AL2: Overvoltage
OFF ON AL1: Undervoltage,
AL2: Undervoltage
ON ON AL1: Overvoltage,
AL2: Undervoltage
22.5 5
90
100
5
K8AB-VW

6Single-phase Voltage Relay K8AB-VW Cat. No. N144-E1-01
Safety Precautions
■Precautions for Safe Use
Make sure to follow the instructions below to ensure safety.
1. Do not use or keep this product in the following environments.
•Outdoors, or places subject to direct sunlight or wearing
weather.
•Places where dust, iron powder, or corrosive gases (in
particular, sulfuric or ammonia gas) exist.
•Places subject to static electricity or inductive noise.
•Places where water or oil come in contact with the product.
2. Make sure to install this product in the correct direction.
3. There is a remote risk of electric shock. Do not touch terminals
while electricity is being supplied.
4. Make sure to thoroughly understand all instructions in the
Instructions Manual before handling this product.
5. Make sure to confirm terminal makings and polarity for correct
wiring.
6. Tighten terminal screws firmly using the following torque.
Recommended torque: 0.54 N·m
7. Operating ambient temperature and humidity for this product
must be within the indicated rating when using this product.
8. There is a remote risk of explosion. Do not use this product where
flammable or explosive gas exists.
9. Make sure that no weight rests on the product after installation.
10.To enable an operator to turn off this product easily, install
switches or circuit breakers that conform to relevant requirements
of IEC60947-1 and IEC60947-3, and label them appropriately.
11.For DC input, use a SELV power-supply capable of overcurrent
protection. Specifically, a SELV power-supply has a double or
reinforced insulation for input and output, and output voltage of
30 Vr.m.s with 42.4 V at peak or DC60V maximum.
Recommended power-supply: Model S8VS-06024@. (Omron
product)
■Precautions for Correct Use
For Proper Use
1. Do not use the product in the following locations.
•Places subject to radiant heat from heat generating devices.
•Places subject to vibrations or physical shocks.
2. Make sure to use setting values appropriate for the controlled
object. Failure to do so can cause unintended operation, and may
result in accident or corruption of the product.
3. Do not use thinner or similar solvent for cleaning. Use commercial
alcohol.
4. When discarding, properly dispose of the product as industrial
waste.
5. Only use this product within a board whose structure allows no
possibility for fire to escape.
About Installation
1. When wiring, use only recommended crimp terminals.
2. Do not block areas around the product for proper dissipation of
heat. (If you do not secure space for heat dissipation, life cycle of
the product will be compromised.)
3. To avoid electrical shocks, make sure that power is not supplied to
the product while wiring.
4. To avoid electrical shocks, make sure that power is not supplied to
the product when performing DIP switch settings.
Noise Countermeasures
1. Do not install the product near devices generating strong high
frequency waves or surges.
2. When using a noise filter, check the voltage and current and
install it as close to the product as possible.
3. In order to prevent inductive noise, wire the lines connected to the
product separately from power lines carrying high voltages or
currents. Do not wire in parallel with or on the same cable as
power lines.
Other measures for reducing noise include running lines along
separate ducts and using shield lines.
To avoid faulty operations,
malfunctions, or failure, observe the
following operating instructions.
1. When turning on the power, make sure to realize rated voltage
within 1 second from the time of first supply of electricity.
2. Make sure to use power supply for operations, inputs, and
transformer with the appropriate capacity and rated burden.
3. Maintenance and handling of this product may only be performed
by qualified personnel.
4. Distortion ratio of input wave forms must be 30% or less. Use of
this product with circuits that have large distortion in wave forms
may result in unwanted operations.
5. Using this product for thyristor controls or inverters will result in
errors.
6. When setting the volume, adjust the control from the minimum
side to the maximum side.

In the interest of product improvement, specifications are subject to change without notice.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
Cat. No. N144-E1-01
OMRON Corporation
Industrial Automation Company
Industrial Devices and Components Division H.Q.
Industrial Control Components Department
Shiokoji Horikawa, Shimogyo-ku,
Kyoto, 600-8530 Japan
Tel: [phone]/Fax: [phone]
Warranty and Application Considerations
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.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other
period if specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT,
MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES
THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS
OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR
COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT,
WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS
UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND
MAINTAINED AND NOT SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in
the customer's application or use of the products.
Take all necessary steps to determine the suitability of the product for the systems, machines, and equipment with which it will be used.
Know and observe all prohibitions of use applicable to this product.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING
THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE
PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
Disclaimers
PERFORMANCE DATA
Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty.
It may represent the result of OMRON's test conditions, and the users must correlate it to actual application requirements. Actual
performance is subject to the OMRON Warranty and Limitations of Liability.
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons. Consult with your
OMRON representative at any time to confirm actual specifications of purchased product.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.