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New Product

Single-phase Overvoltage/Undervoltage Relay

K8AK-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 Monitoring Mode.

• Two SPDT output relays, 5 A at 250 VAC (resistive load).

• Process control signal (0 to 10 V) and current splitter input

supported.

• Output status can be monitored using LED indicator.

• Input frequency of 40 to 500 Hz supported.

• Inputs are isolated from the power supply.

Ordering Information

List of Models

Ratings and Specifications

Input Range

* The range is selected using connected terminals.

Refer to Safety Precautions on page 9.

Refer to page 8 for commonly asked questions.

For the most recent information on models that have been certified for

safety standards, refer to your OMRON website.

Setting range Power supply voltage Model

1 to 10 V AC/DC

3 to 30 V AC/DC

15 to 150 V AC/DC

24 VAC/DC K8AK-VW2 24 VAC/DC

100 to 240 VAC K8AK-VW2 100-240 VAC

20 to 200 V AC/DC

30 to 300 V AC/DC

60 to 600 V AC/DC

24 VAC/DC K8AK-VW3 24 VAC/DC

100 to 240 VAC K8AK-VW3 100-240 VAC

Model Range* Connection terminal Setting range Input impedance Overload capacity

K8AK-VW2

0 to 10 V AC/DC V1-COM

1 to 10 V AC/DC

3 to 30 V AC/DC

15 to 150 V AC/DC

Approx. 120 kΩ

Continuous input at 115% of

maximum input.

10 s at 125%

(up to 600 VAC)

0 to 30 V AC/DC V2-COM Approx. 320 kΩ

0 to 150 V AC/DC V3-COM Approx. 1.6 MΩ

K8AK-VW3

0 to 200 V AC/DC V1-COM

20 to 200 V AC/DC

30 to 300 V AC/DC

60 to 600 V AC/DC

Approx. 1.2 MΩ

0 to 300 V AC/DC V2-COM Approx. 1.7 MΩ

0 to 600 V AC/DC V3-COM Approx. 3.1 MΩ

Summary of content (12 pages)

PAGE 1
New Product Single-phase Overvoltage/Undervoltage Relay K8AK-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 Monitoring Mode. • Two SPDT output relays, 5 A at 250 VAC (resistive load). • Process control signal (0 to 10 V) and current splitter input supported.
PAGE 2
K8AK-VW Ratings Power supply voltage Isolated power supply Power consumption 24 VAC/DC 100 to 240 VAC 24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
PAGE 3
K8AK-VW Specifications Allowable operating voltage range 85% to 110% of rated power supply voltage Allowable operating frequency range 50/60 Hz ±5 Hz Input frequency range 40 to 500 Hz Overload capacity Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC). Repeat error Applicable standards Operating value ±0.
PAGE 4
K8AK-VW Wiring Example Single-phase power supply Load 21 24 22 V1 V2 V3 Power supply AC/DC A2 Power supply voltage A1 A1 A2 C 11 12 14 Timing Charts ●Overvoltage and Undervoltage Operation Diagram ●Undervoltage and Undervoltage Operation Diagram (Undervoltage Pre-alarm Mode) DIP switch settings: SW3 and SW4 both ON or both OFF. DIP switch settings: SW3 OFF and SW4 ON.
PAGE 5
K8AK-VW Nomenclature ●Indicators Front Item Terminal block (See notes 1 and 2.) 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 set value while the operating time is being clocked.
PAGE 6
K8AK-VW Operation Methods Setting Ranges and Wiring Connections Model K8AK-VW2 K8AK-VW3 Setting range 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.
PAGE 7
K8AK-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.
PAGE 8
K8AK-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.
PAGE 9
K8AK-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.
PAGE 10
K8AK-VW Precautions for Safe Use 1. Do not use or store the product in the following locations. • Locations subject to water or oil • Outdoor locations or under direct sunlight • Locations subject to dust or corrosive gases (particularly sulfurizing gases, ammonia, etc.
PAGE 11
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. Warranties. (a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron).
PAGE 12
OMRON Corporation Industrial Automation Company Authorized Distributor: Tokyo, JAPAN Contact: www.ia.omron.com Regional Headquarters OMRON EUROPE B.V. Wegalaan 67-69-2132 JD Hoofddorp The Netherlands Tel: (31)2356-81-300/Fax: (31)2356-81-388 OMRON ELECTRONICS LLC One Commerce Drive Schaumburg, IL 60173-5302 U.S.A. Tel: (1) 847-843-7900/Fax: (1) 847-843-7787 OMRON ASIA PACIFIC PTE. LTD. No.