New Product Three-phase Asymmetry and Phase-sequence Phase-loss Relay K8DS-PA Ideal for 3-phase Voltage Asymmetry Monitoring for Industrial Facilities and Equipment. * Greater resistance to inverter noise. * Monitor voltage asymmetry, phase sequence, and phase loss in threephase 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. Refer to Safety Precautions on page 8. Refer to page 7 for commonly asked questions. For the most recent information on models that have been certified for safety standards, refer to your OMRON website. Ordering Information List of Models Rated input voltage* 3-phase 3-wire mode 200, 220, 230, or 240 VAC Model K8DS-PA1 380, 400, 415, or 480 VAC K8DS-PA2 Note: The input range is set with a rotary switch. * The power supply voltage is the same as the rated input voltage. 1 K8DS-PA Ratings and Specifications Ratings Rated input voltage K8DS-PA1 Three-phase, three-wire Mode: 200, 220, 230, or 240 VAC K8DS-PA2 Three-phase, three-wire Mode: 380, 400, 415, or 480 VAC Input load K8DS-PA1: Approx. 1.7 VA K8DS-PA2: Approx. 2.8 VA Operating value setting range (ASY.) Asymmetry set value (%) = 2 to 22% Operating value Asymmetry operating value = Rated input voltage x Asymmetry set value (%) The asymmetry operation will function when the potential difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value. Reset value 5% of operating value (fixed) Reset method Automatic reset Operating time Asymmetry setting range Phase sequence (T) Phase loss 0.1 to 30 s Power ON lock time (LOCK) 1 s0.5 s Indicators Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red Output relays One SPDT relay output Output relay ratings Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum switching capacity: 1,250 VA, 150 W Minimum load: 5 VDC, 10 mA (reference values) Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC: 50,000 operations 3 A at 250 VAC: 100,000 operations Ambient operating temperature -20 to 60C (with no condensation or icing) Storage temperature -25 to 65C (with no condensation or icing) Ambient operating humidity 25% to 85% (with no condensation) Storage humidity 25% to 85% (with no condensation) Altitude 2,000 m max. Terminal screw tightening torque 0.49 to 0.59 N*m 0.1 s0.05 s 0.1 s max. Recommended wire Solid wire: 2.5 mm2 Twisted wires: AWG16, AWG18 Terminal wiring method Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact 2 Case color N1.5 Case material PC and ABS, UL 94 V-0 Weight Approx. 65 g Mounting Mounts to DIN Track. Dimensions 17.5 x 80 x 74 mm (WxDxH) K8DS-PA Specifications Input frequency 50/60 Hz Overload capacity Continuous 500 V 0.5% full scale (at 25C and 65% humidity, rated power supply voltage, 50/60 Hz sine wave input) Repeat accura- Operating value cy Operating time Applicable standards 50 ms (at 25C and 65% humidity, rated power supply voltage) Conforming standards EN 60947-5-1 Installation environment (pollution level 2, installation category III) EMC EN 60947-5-1 Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14, CCC: GB14048.5 Insulation resistance 20 M min. Between external terminals and case Between input terminals and output terminals Dielectric strength 2,000 VAC for one minute Between external terminals and case Between input terminals and output terminals Noise immunity 1,500 V power supply terminal common/normal mode Square-wave noise of 1 s/100 ns pulse width with 1-ns rise time Vibration resistance Frequency: 10 to 55 Hz, acceleration 50 m/s2 10 sweeps of 5 min each in X,Y, and Z directions Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes Degree of protection Terminals: IP20 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. 70 Ambient temperature [C] 60 50 40 30 20 10 0 5 10 15 20 25 30 35 40 45 50 Distance between products d [mm] Test method Sample: K8DS-PA Distance between products: 0, 5, 10, and 50 mm K8DS No.1 DIN Track K8DS No.2 K8DS No.3 K8DS No.4 K8DS No.5 Distance between products: d 3 K8DS-PA Connections Terminal Diagram Control Output L2 L1 Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) Input Voltages L3 L1 L2 L3 3-phase, 3-wire power supply Phase-to-phase voltage: 200 to 480 VAC Relay Output 14 12 11 12 14 11 Note: Use the recommended ferrules if you use twisted wires. Wiring Example L1 3-phase voltage L2 Motor L3 L1 L2 L3 Power supply AC/DC 14 12 11 Timing Charts Voltage Asymmetry and Phase Sequence/Phase Loss Operation Diagram L1 Asymmetry operating value Input L2 L3 Flashing Lit Alarm indicator Contacts t1 t t1: Power ON lock (1 s) Phase Loss Operation L1 Input L2 t: Operating time (0.1 to 30 s) Phase sequence Operation L2 L1 L3 L1 L1 L3 L2 L2 L3 L2 L1 L3 L3 Lit Flashing Flashing Flashing Alarm indicator Operation Table Relay 11-14 Note: 1. The K8DS-PA 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 the phase-to-phase voltages goes below 60% of the rated input. 4. L2 and L3 are also used for the power supply. If the voltage becomes very low, the Relay will not operate. 5. Phase loss is not detected in the motor load during operation. 6. Phase loss cannot be detected on the load side because detection is based on the voltage. Calculation Formula for Asymmetry Operating Value Asymmetry operating condition = (Highest voltage - Lowest voltage) > Asymmetry operating value Asymmetry operating value = Rated input voltage (V) x Asymmetry set value (%) Note: The rated input voltage is set with a rotary switch. 4 Item Indicators RY_LED ALM_LED Contact operation Asymmetry OFF ON OFF Phase loss OFF ON*1 OFF OFF Flashing*2 OFF ON OFF ON Incorrect phase Phase sequence Correct phase *1 *2 L2 and L3 are also used for the power supply. If the voltage becomes very low, the indicator will turn OFF. The indicator will flash once per second after an incorrect phase is detected and once per 0.5 second during the detection time. K8DS-PA Nomenclature Front Indicators Item Terminal block (See notes 1 and 2.) L1 L2 L3 Input voltage range rotary switch Power indicator Asymmetry rate knob (ASY.) Meaning Power indicator (PWR: Green) Lit when power is being supplied.* Relay status indicator (RY: Yellow) Lit when relay is operating (normally lit). Alarm indicator (ALM: Red) Lit for asymmetry voltage error. When the input exceeds the set value, the indicator flashes for the operating time to indicate the error status. Relay status indicator Alarm indicator Operating time knob (T) * 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 Terminal block (See notes 1 and 2.) 14 12 11 Description Input voltage range rotary switch Used to change the input voltage range. K8DS-PA1: 200, 220, 230, or 240 V K8DS-PA2: 380, 400, 415, or 480 V Asymmetry rate knob (ASY.) Used to set from 2% to 22%. Operating time knob (T) Used to set the operating time to 0.1 to 30 s. 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 smaller solid wires For ferrules with an insulation sleeve. 8 mm max. 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. Tightening torque: 0.49 to 0.59 N*m Operation Methods Connections Input L1 L2 L3 Wire the input to the L1, L2, and L3 terminals (3-phase, 3-wire). Make sure the phase sequence is wired correctly. The Unit will not operate normally if the phase sequence is incorrect. Voltage input Outputs L1 L2 L3 Terminals 11, 12, and 14 are the output terminals. * Use the recommended ferrules if you use twisted wires. 14 Signal output 12 11 Relay signal output Load 5 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 is 20 V and an alarm will be output if the difference between the minimum and maximum phases for two of the three phases exceeds 20 V. Operating Time The operating time is set using the operating time knob (T). The operating time can be set to between 0.1 and 30 s. 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 operating time. If the input exceeds the asymmetry set value, the alarm indicator will start flashing for the set period and then stay lit. Dimensions (Unit: mm) Three-phase Asymmetry and Phase-sequence Phase-loss Relays K8DS-PA1 K8DS-PA2 17.5 74 80 44 69 Optional Parts for DIN Track Mounting DIN Tracks PFP-100N PFP-50N 7.30.15 4.5 350.3 15 25 10 25 25 1,000 (500)* 10 25 15 (5)* 270.15 1 *Dimensions in parentheses are for the PFP-50N. 6 K8DS-PA Questions and Answers Q Q 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 x 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 Mode for Rated Voltage of 200 V and an Operating Time Setting of 5 s L1 Input L2 Asymmetry operating voltage (set value) L3 Q Contacts 5s T1: Power ON lock (1 s) Q Connection Diagram 1 L1 V1 L2 3-phase, 200 VAC V2 V3 L1 L3 0 to 150 V L2 L3 3-phase variable autotransformer Q Load-side Phase Loss In principle, phase loss cannot be detected on the load side because the K8DS-PA measures three-phase voltage to determine phase loss. Flashing Lit Alarm indicator Checking the Phase Sequence and Phase Loss Operation How to Measure the Operating Time Operating Time Adjust the slide resistor so that the voltage difference applied to the K8DS terminals is equal to or greater than the asymmetry operating value when the auxiliary relay operates, as shown in connection diagram 2. Close the switch and use a cycle counter to measure the operating time. Motor Load Phase Loss during Operation Phase loss cannot be detected for motor loads during operation. Use the asymmetry detection function. Normally, three-phase motors will continue to rotate even if one phase is open. The three-phase voltage will be induced at the motor terminals. The diagram shows voltage induction at the motor terminals when phase R is lost with a load applied to a three-phase motor. The horizontal axis shows the motor load as a percentage of the rated load, and the vertical axis shows voltage as a percentage of the rated voltage. The lines in the graph show the voltage induced at the motor terminals for each load when phase loss occurs during operation. As the graph shows, phase loss cannot be detected because the motor terminal voltage does not drop very much even if a phase is lost when the load on the motor is light. Use the asymmetry detection function to detect asymmetry in the motor terminal voltages. Set the operating time carefully because it will affect the time from when the phase loss occurs until tripping when this function is used. Characteristic Curve Diagram Note: This characteristic curve shows the approximate values only. L1 V1 3-phase, 200 VAC L2 L1 R1 X X/a X/b V2 V3 L3 R2 L2 R1: Sliding resistor, 200 , 200 W R2: 100 , 400 W L3 Voltage (as a percentage of rated voltage) Connection Diagram 2 100 95 90 VST 85 80 VTR 75 70 65 60 55 50 45 C 200 V Cycle counter 0 VRS 10 20 30 40 50 60 70 80 90 100 110 Motor load (as a percentage of rated load) Note: For phase loss of phase R. VST, VTR, and VRS indicate the motor terminal voltage at phase loss. 7 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/. 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. Precautions for Safe Use Supplementary comments on what to do or avoid doing, to use the product safely. Precautions for Correct Use Supplementary comments on what to do or avoid doing, to prevent failure to operate, malfunction, or undesirable effects on product performance. Meaning of Product Safety Symbols Used to warn of the risk of electric shock under specific conditions. WARNING Electrical shock may occasionally cause serious injury. Confirm that the input voltage is OFF before starting any wiring work and wire all connections correctly. CAUTION 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 the product. Explosions may cause minor injuries. Do not use the product in locations with inflammable or explosive gases. Used for general prohibitions for which there is no specific symbol. There is a risk of minor electrical shock, fire, or device failure. Do not disassemble, modify, repair, or touch the inside of the product. Used to indicate prohibition when there is a risk of minor injury from electrical shock or other source if the product is disassembled. Loose screws may cause fires. Tighten terminal screws to the specified torque of 0.49 to 0.59 N*m. Used for general mandatory action precautions for which there is no specified symbol. Use of excessive torque may damage the terminal screws. Tighten terminal screws to the specified torque of 0.49 to 0.59 N*m. Use of the product beyond its life may result in contact welding or burning. Make sure to consider the actual operating conditions and use the product within its rated load and electrical life count. The life of the output relay varies significantly with the switching capacity and switching conditions. 8 K8DS-PA 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 temperature and humidity are within the specified ranges. If applicable, provide forced cooling. 3. Mount the product in the correct direction. 4. Do not wire the input and output terminals incorrectly. 5. Make sure the input voltage and loads are within the specifications and ratings for the product. 6. Make sure the crimp terminals for wiring are of the specified size. 7. Do not connect anything to terminals that are not being used. 8. Use a power supply that will reach the rated voltage within 1 second after the power is turned ON. 9. Keep wiring separate from high voltages and power lines that draw large currents. Do not place product wiring in parallel with or in the same path as high-voltage or high-current lines. 10.Do not install the product near equipment that generates high frequencies or surges. 11.The product may cause incoming radio wave interference. Do not use the product near radio wave receivers. 12.Install an external switch or circuit breaker and label it clearly so that the operator can quickly turn OFF the power supply. 13.Make sure the indicators operate correctly. Depending on the application environment, the indicators may deteriorate prematurely and become difficult to see. 14.Do not use the product if it is accidentally dropped. The internal components may be damaged. 15.Be sure you understand the contents of this catalog and handle the product according to the instructions provided. 16.Do not install the product in any way that would place a load on it. 17.When discarding the product, properly dispose of it as industrial waste. 18.The product must be handled only by trained electrician. 19.Prior to operation, check the wiring before you supply power to the product. 20.Do not install the product immediately next to heat sources. 21.Perform periodic maintenance. Precautions for Correct Use Observe the following operating methods to prevent failure and malfunction. 1. Use the input power and other power supplies and converters with suitable capacities and rated outputs. 2. Use a precision screwdriver or similar tool to adjust the setting knobs and rotary switches. 3. The distortion in the input waveform must be 30% max. If the input waveform is distorted beyond this level, it may cause unnecessary operation. 4. The product cannot be used for thyristor control or on the secondary side of an inverter. To use the product on the secondary side of an inverter, install a noise filter on the primary side of the inverter. 5. To reduce the error in the setting knob, always turn the setting knob from the minimum setting toward the maximum setting. 6. Phase loss is detected only when the power supply to the motor is turned ON. Phase loss during motor operation is not detected. 7. Phase loss can be detected only from the input contacts to the power supply side. Phase loss cannot be detected from the input contacts to the load side. 8. When cleaning the product, do not use thinners or solvents. Use commercial alcohol. Mounting and Removing * The product may be mounted in any direction, but it must be mounted securely and as level as possible. * To mount the product to the DIN Track, hook it on the DIN Track at (A) and then press in on the Unit in direction (B). (A) (B) * To remove the product, insert a flat-blade screwdriver at (C) and pull down the hook to release the Unit. (C) Hook 30 mm min. * Leave at least 30 mm of space between the product and other devices to allow easy installation and removal. 9 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 10 Terms and Conditions of Sale 1. Offer; Acceptance. These terms and conditions (these "Terms") are deemed part of all quotes, agreements, purchase orders, acknowledgments, price lists, catalogs, manuals, brochures and other documents, whether electronic or in writing, relating to the sale of products or services (collectively, the "Products") by Omron Electronics LLC and its subsidiary companies ("Omron"). 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