omRon Three-phase Voltage RelayK8AK-PW C€ cW.s @ ® Ideal for Monitoring 3-phase Power Supplies for Industrial Facilities and Equipment. • Greater resistance to inverter noise. new • Monitor overvoltages and undervoltages for three-phase 3-wire or 4-wire power supplies. DIP switch setting for 3-phase 3-wire or 3-phase 4-wire power supply. •Two SPDT output relays, 5 A at 250 VAC (resistive load). Separate outputs possible for overvoltages and undervoltages. •World-wide power specifications supported by one Unit (switchable using DIP switch). • Relay status can be monitored using LED indicator. A Refer to Safety Precautions on page 9. Refer to 8 for commonly asked questions. Ordering InformationList of Models Rated input* Note: Three-phase, three-wire or four-wire and the input range are switched using a DIP switch. * The power supply voltage is the same as the rated input voltage. •Single K8AK Monitors 3-phase Power Supply with 3 or 4 Wires Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings. [Phase to phase voltage (3 wires)] | Phase to neutral voltage (4 wires)]

Specifications Input frequency range •Relationship of Mounting Distance between K8AK-PW Relays and Ambient Temperature (Reference Values) The following diagram shows the relationship between the mounting distances and the ambient temperature. If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components. Test method Sample: K8AK-PW Mounting distances: 0, 5, and 10 mm min. DIN Track Distance between products: d

Connections Terminal Diagram Control Output 21 Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) Input Voltages Relay Output Monitoring 3-phase, 3-wire Power Supply Note: 1. Do not connect anything to terminals that are shaded in gray. 2. Use the recommended ferrules if you use twisted wires. Power supply AC/DC Timing Charts ●Overvoltage and Undervoltage Operation Diagram Overvoltage set value Overvoltage alarm indicator Flashing Undervoltage alarm indicator Overvoltage relay 11-14 Undervoltage relay 21-24 Note: 1. K8AK-PW@ output relay is normally operative. 2. The power...

NomenclatureFront •Indicators Item * The input across L1 and L2 is used for the internal power supply. Therefore, the power indicator will not be lit if there is no input across L1 and L2. •Setting Knobs 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. Recommended ferrules Phoenix Contact • Al 1,5-8BK...

•Input Connect to L1, L2, and L3 (for three-phase three-wire mode) or L1, L2, L3, and N (for three-phase four-wire mode), depending on the mode selected using pin 2 on the DIP switch. The Unit will not operate correctly if the DIP switch setting and the wiring do not agree. Make sure the phase sequence is wired correctly. The Unit will not operate normally if the phase sequence is incorrect. •Outputs Terminals 11, 12, and 14 are the output terminals for overvoltage (SPDT). Terminals 21, 22, and 24 are the output terminals for undervoltage (SPDT). * Use the recommended ferrules if you use twisted...

K8AK-PW Setting Method ●Overvoltage The overvoltage knob (OVER) is used to set the overvoltage. The overvoltage can be set to between −30% and 25% of the rated input voltage. 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 rated input depends on the model and DIP switch setting. Example: K8AK-PW1 with Pin 2 Turned OFF (Three-phase, Three-wire Mode) and Pins 3 and 4 Turned OFF (Rated Voltage of 200 V) The rated input voltage is 200 VAC and the...

Checking Operation Overvoltage Gradually increase the input from 80% of the set value. The input value 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 output 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: For monitoring mode set to three-phase three-wire monitoring, a rated voltage of 200 V, and an operating time of 5 s. Note: K8AK-PW@ output relays...

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...

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 ambient...