omRonSingle-phase Overvoltage/Undervoltage RelayK8AK-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. A Refer to Safety Precautions on page 9. Refer to page 8 for commonly asked questions. Ordering Information List of Models * The range is selected using connected terminals.

K8AK-VW Specifications Allowable operating voltage range 85% to 110% of rated power supply voltage Allowable operating frequency range Input frequency range Overload capacity Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC). Operating value ±50 ms (at 25°C and 65% humidity, rated power supply voltage) Conforming standards EN 60947-5-1 Installation environment (pollution level 2, installation category III) Safety standards Applicable standards ±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, DC and 50/60 Hz sine wave input) Operating...

K8AK-VW Wiring Example Single-phase power supply Power supply AC/DC A2 Power supply voltage A1 A1 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. Power supply voltage Power supply voltage Hysteresis: Fixed at 5% Hysteresis: Fixed at 5% Undervoltage set value (AL2) Input Undervoltage set value (AL2) Flashing AL1 alarm indicator Flashing Delay: 250 ms (reference value) Delay: 250 ms (reference value) Note: 1. The K8AK-VW@ output relay is normally operative....

NomenclatureFront •Indicators Item •Setting Knobs Item Note: 1. Use either a solid wire of 2.5 mm2 maximum or a ferrule with insulating sleeve for the terminal connection. The length of the exposed current-carrying part inserted into the terminal must be 8 mm or less to maintain dielectric strength after connection. For 2.5 mm2 or For ferrules with smaller solid wires an insulation sleeve. 8 mm max. 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

Connections •Input 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. •Power Supply Connect the power supply to terminals A1 and A2. •Outputs AL1 (SPDT relay) is output to terminals 11, 12, and 14. AL2 (SPDT relay) is output to terminals 21, 22, and 24. Note: Use the recommended ferrules if using twisted wires. The power ON lock time, resetting method and operating mode are set using the DIP switch located on the bottom of the Unit. Note: All...

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. Example: K8AK-VW3 Using Input Terminal V3-COM The maximum setting range will be 600 VAC/VDC and the setting range will be 60 to 600...

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. Example: Overvoltage Operating Mode, Undervoltage Operating Mode and an Operating Time of 5 s Note: K8AK-VW@ output relays are normally operative. Set value Input...

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 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...

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.) • Locations subject to rapid temperature changes • Locations prone to icing and dew condensation • Locations subject to excessive vibration or shock • Locations subject to wind and rain • Locations subject to static electricity and noise • Habitats of insects or small animals 2. Use and store the product in a location where the...

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). Omron disclaims all other warranties, express or implied. (b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR...