omRonThree-phase Asymmetry and Phase-sequence Phase-loss RelayK8DS-PA Ideal for 3-phase Voltage Asymmetry Monitoring for Industrial Facilities and Equipment. • Greater resistance to inverter noise. new • Monitor voltage asymmetry, phase sequence, and phase loss in three-phase three-wire circuits with one unit. • One SPDT output relay, 5 A at 250 VAC (resistive load). •World-wide power specifications supported by one unit. (Set with a rotary switch.) •Relay status can be monitored using LED indicator. A Refer to Safety Precautions on page 8. Refer to page 7 for commonly asked questions. Ordering Information List of Models Note: The input range is set with a rotary switch. * The power supply voltage is the same as the rated input voltage.

Specifications Input frequency •Relationship of Mounting Distance between K8DS-PA 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 K8DS may rise and shorten the life of the internal components. DIN Track Distance between products: d

Terminal Diagram Relay Output Note: Use the recommended ferrules if you use twisted wires. Wiring Example •Voltage Asymmetry and Phase Sequence/Phase Loss Operation Diagram Alarm indicator Contacts Flashing LHHL Phase Loss Operation i Operation Table Note: 1. The K8DS-PAQ output contacts are normally operative. 2. The power ON lock prevents unnecessary alarms from being generated during the unstable period when the power is first turned ON. There is no contact output during timer operation. 3. Phase loss is detected by a drop in the L1, L2, or L3 voltage. A phase loss is detected when any of...

NomenclatureFront •Indicators Item * This indicator uses the input across L2 and L3 as the internal power supply. It will not light unless there is an input across L2 and L3. •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. Recommended ferrules Phoenix Contact • Al 1,5-8BK (for AWG16) •...

K8DS-PA Setting Methods ●Asymmetry The asymmetry rate is set using the asymmetry rate knob (ASY.) The setting range is 2% to 22% of the rated input. 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 make the setting. The rated input depends on the model and the rotary switch setting. Example: K8DS-PA1 with Rotary Switch Set to 200 V The rated input is 200 VAC, so the setting range is 4 to 44 V. If the setting (ASY. knob) is at 10%, the asymmetry operation voltage...

Checking Operation With the rated input voltage applied, gradually change one of the phase-to-phase voltages. The Relay will operate when the difference between the highest and lowest voltage phases reaches or exceeds the asymmetry operating value. Asymmetry operating value = Rated input voltage × Asymmetry set value (%) Phase Sequence Operation Switch the wiring, as shown by the dotted lines in connection diagram 1, to reverse the phase sequence and check that the K8DS operates. Phase Loss Operation Create a phase loss for any input phase and check that the K8DS operates. Example: Monitoring...

Warning Indications K8DS-PA 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...

K8DS-PA Operating the Setting Knobs and Rotary Switch • Use a screwdriver to adjust the setting knobs and rotary switch. The knobs have a stopper that prevents them from turning beyond the full right or left position. Do not force a knob beyond these points. Setting knob

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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