Phase-sequence Phase-loss RelayK8AK-PH Three-phase Phase-sequence Phase-loss Relay Using Voltage Detection Method • Greater resistance to inverter noise. new • Distinguishes between correct phases, phase sequence, and phase loss when power is turned ON. • Supports phase loss detection when the motor is operating. •5 A (resistive load) at 250 VAC, DPDT x 1. • Output status can be monitored using LED indicator. • Ideal to prevent reverse operation of motors. A Refer to Safety Precautions on page 8. Refer to page 7 for commonly asked questions. Ordering Information List of Models * The power supply voltage is the same as the rated input voltage.

Specifications Input voltage range •Relationship of Mounting Distance between K8AK-PH 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-PH Mounting distances: 0, 5, and 10 mm min. DIN Track Distance between products: d

Connections Terminal Diagram Control Output Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) Input voltage Note: 1. Use the recommended ferrules if you use twisted wires. Power supply AC/DC Alarm load 21 Timing Charts ●Phase Sequence and Phase Loss Operation Diagram Phase Loss Operation Phase Sequence Operation L2 Note: 1. The K8AK-PH1 output contacts are normally operative. 2. The Relay will not operate if the input voltage drops below 70% of the minimum input value because L1 and L2 are also used to provide power. 3. Phase loss cannot be detected on the load side because...

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. 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 (for AWG16) • Al...

Three-phase Phase-sequence Phase-loss Relay K8AK-PH1 Optional Parts for DIN Track Mounting ●DIN Tracks PFP-100N PFP-50N

Checking Operation Phase Sequence Switch the wiring, as shown by the dotted lines in the connection diagram, to reverse the phase sequence and check that the K8AK operates. Phase Loss Create a phase loss for any input phase and check that the K8AK operates. Can phase loss be detected on the load side? In principle, phase loss cannot be detected on the load side because the K8AK-PH measures three-phase voltage to determine phase loss. Is it possible to detect phase losses for motor loads while the motor is operating? Phase loss can be detected while the motor is operating. However, the detection...

Warning Indications K8AK-PH Safety Precautions Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/. Electrical shock may occasionally cause serious injury. Confirm that the input voltage is OFF before starting any wiring work and wire all connections correctly. Electrical shock may cause minor injury. Do not touch terminals while electricity is being supplied. 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...

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...

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...

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