Three-phase Phase-sequence Phase-loss Relay K8AB-PM CSM_K8AB-PM_DS_E_3_1 Ideal for monitoring 3-phase power supplies for industrial facilities and equipment. • Monitor overvoltages, undervoltages, phase sequence, and phase loss for three-phase 3-wire or 4-wire power supplies with just one Unit. Switch setting for 3-phase 3-wire or 3-phase 4-wire power supply. • Two SPDT output relays, 6 A at 250 VAC (resistive load). Output overvoltages and undervoltages using separate relays. • World-wide power specifications supported by one Unit (switchable). • Output status can be monitored using LED indicator. Refer to Safety Precautions for the K8AB Series. Refer to page 8 for the Q&A section. Model Number Structure ■ Model Number Legend K8AB-@@ 1 2 3 1. Basic Model K8AB: Measuring and Monitoring Relays 2. Functions PM: Three-phase Phase-sequence Phase-loss Relay (Simultaneous upper and lower monitoring) 3. Rated Input Voltage 1: 115, 127, 133, 138, 200, 220, 230, 240 VAC 2: 220, 230, 240, 277, 380, 400, 415, 480 VAC Ordering Information ■ List of Models Three-phase Phase-sequence Phase-loss Relay Rated input (See note 2.) 3-phase 3-wire mode 200, 220, 230, 240 VAC 3-phase 4-wire mode 115, 127, 133, 138 VAC 3-phase 3-wire mode 380, 400, 415, 480 VAC 3-phase 4-wire mode 220, 230, 240, 277 VAC Model K8AB-PM1 K8AB-PM2 Note: 1. Three-phase 3-wire or 4-wire and the input range are switched using a DIP switch. 2. The power supply is shared with the rated input voltage. 1 K8AB-PM Ratings and Specifications ■ Ratings Rated input voltage K8AB-PM1 Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC K8AB-PM2 Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC Input load K8AB-PM1: 25 VA max. K8AB-PM2: 45 VA max. Operating value setting range (OVER, UNDER) Overvoltage −30% to 25% of rated input voltage Undervoltage −30% to 25% of rated input voltage Note: The rated input voltage can be switched using the DIP switch. Operating value 100% operation at set value Reset value 5% of operating value (fixed) Reset method Operating time setting range (T) Automatic reset Overvoltage/undervoltage 0.1 to 30 s Reversed phase/phase loss 0.1 s max. Startup lock time (LOCK) 1 s or 5 s (Switched using DIP switch.) Indicators Power (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red Output relays Two SPDT relays (NC operation) Output relay ratings Rated load Resistive load 6 A at 250 VAC (cosφ = 1) 6 A at 30 VDC (L/R = 0 ms) Inductive load 1 A at 250 VAC (cosφ = 0.4) 1 A at 30 VDC (L/R = 7 ms) Maximum contact voltage: 250 VAC Maximum contact current: 6 A AC Maximum switching capacity: 1,500 VA Minimum load: 10 mA at 5 VDC Mechanical life: 10,000,000 operations Electrical life: Make: 50,000 times, Break: 30,000 times Ambient operating temperature −20 to 60°C (with no condensation or icing) Storage temperature −40 to 70°C (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 N·m Terminal wiring method Recommended wire Solid wire: 2.5 mm2 Twisted wires: AWG16, AWG18 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 Case color Munsell 5Y8/1 Case material ABS resin (self-extinguishing resin) UL94-V0 Weight Approx. 130 g Mounting Mounted to DIN Track or via M4 screws (tightening torque: 1.2 N·m) Dimensions 22.5 (W) × 90 (H) × 100 (D) mm 2 K8AB-PM ■ Specifications Input frequency range 45 to 65 Hz Overload capacity Continuous input: 115% of maximum input, 10 s max.: 125% of maximum input Setting error Operating value Set value ±10% of full scale Operating time Repeat error Startup lock time Set value ±0.5 s Operating value Operating value ±2% Error calculation: Error = ((Maximum operating value − Minimum operating value (over 10 operations))/2)/ Average value × 100% Reset value Overvoltage: Operating value x 95% ±2% Undervoltage: Operating value x 105% ±2% Error calculation: Error = ((Maximum reset value − Minimum reset value (over 10 resets))/2)/Average value × 100% Operating time Operating time repeat error: ±50 ms Overvoltage: Measured when input suddenly changes from 70% to 120% of setting. Undervoltage: Measured when input suddenly changes from 120% to 70% of setting. The input voltage, however, must be between 70% and 125% of rating. Startup lock time Startup lock time repeat error: ±0.5 s (The operating time when the operating time is set to the minimum value and the power supply suddenly changes from 0% to 100%.) Temperature influence Operating value Drift based on measured value at standard temperature: −20°C to standard temperature: ±1,000 ppm/°C max. Standard temperature to 60°C : ±1,000 ppm/°C max. (Humidity: 25% to 80%) Operating time Fluctuation based on measured value at standard temperature: −20°C to standard temperature: ±10% max. Standard temperature to 60°C : ±10% max. (Humidity: 25% to 80%) Humidity influence Operating value Based on ambient humidity of 65% 25% to 80%: ±5% max. Operating time Based on ambient room humidity 25% to 80%: ±10% max. Influence of input frequency At 45 to 65 Hz Operating value ±5% max. Operating time ±10% max. Note: The error in the operating value and operating time under standard conditions. Applicable standards Conforming standards EN60255-5 and EN60255-6 Installation environment (Pollution Degree 2, Overvoltage Category III) EMC EN61326 Safety standards UL508 Insulation resistance 20 MΩ min. Between external terminals and case Between input terminals and output 1 terminals Between input terminals and output 2 terminals Between output 1 terminals and output 2 terminals Dielectric strength 2,000 VAC for one minute Between external terminals and case Between input terminals and output 1 terminals Between input terminals and output 2 terminals Between output 1 terminals and output 2 terminals Noise immunity 1,500 V power supply terminal common/normal mode Square-wave noise of ±1 µs/100 ns pulse width with 1-ns rise time Vibration resistance Frequency 10 to 55 Hz, 0.35-mm single amplitude, 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 three axes (up/down, left/right, forward/backward) Degree of protection Terminal section: Finger protection 3 K8AB-PM Connections ■ Wiring Diagram Overvoltage/Undervoltage and Phase Sequence/Phase Loss Operation Diagram N L1 L2 L3 Overvoltage setting value Hysteresis: Fixed at 5% L1 Input L2 L3 Hysteresis: Fixed at 5% Voltage input Undervoltage setting value Flashing Overvoltage alarm indicator Flashing Lit Undervoltage alarm indicator T L2 T: Operating time (0.1 to 30 s) L3 Overvoltage relay 14 Signal output 12 Undervoltage relay T L1 Lit T: Operating time (0.1 to 30 s) N 11 Overvoltage T1: Power ON lock (1 s or 5 s) T1 Phase loss operation 24 Signal output 22 Undervoltage Phase sequence operation L1 L3 L1 L1 L3 L2 L2 L2 L1 L3 L3 Flashing Flashing Phase loss, reversed phase Load Input L2 21 Operation Indicators Undervoltage alarm indicator Undervoltage relay Note: 1. The K8AB-PM output relay is normally operative. 2. The power ON lock prevents unnecessary alarms from being generated during the instable period when the power is first turned on. There is no relay output during timer operation. 3. Phase loss is detected by L1, L2, and L3 voltage drops. A phase loss will exist if any of the phases drops below 60% of the rated input. 4. L1 and L2 function both as the power supply terminals and as input terminals. If the voltage drops dramatically, then the Relay will not operate due to an undervoltage. 5. Motor load phase loss cannot be detected during operation. 6. Phase loss is detected based on voltage, so phase loss cannot be detected on the load side. Item Display Contact operation Ry_LED Over_LED Under_LED Over_Ry Under_Ry Overvoltage ON ON Off Off ON Undervoltage ON OFF ON ON OFF Phase loss OFF OFF ON (See note 1.) Reversed phase ON OFF Flashing ON (See note 2.) OFF Correct phase ON OFF OFF ON OFF OFF (See note 1.) ON Note: 1. While phase loss is detected, Over_Ry will also be OFF. 2. The indicator will flash once per second after a phase loss is detected and once per 0.5 second during the detection time. 4 K8AB-PM Nomenclature ■ Front Indicators Terminal block (See notes 1 and 2.) Overvoltage knob (OVER) Power indicator Undervoltage knob (UNDER) Relay status indicator Alarm indicator Terminal block (See notes 1 and 2.) 0.1 Operating time knob (T) Item Power indicator (PWR: Green) Relay status indicator (RY: Yellow) Alarm Overvoltage: indicator Red Meaning Lit when power is being supplied (see note). Lit when relay is operating (normally lit). Lit when there is an overvoltage. The indicator flashes to indicate the error status after the overvoltage has exceeded the threshold value while the operating time is being clocked. Undervoltage: • Lit when there is an undervoltage or phase loss. Red The indicator flashes to indicate the error status after the undervoltage has exceeded the threshold value while the operating time is being clocked. • Lit when there is a phase sequence error. Note: 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 Item Usage Overvoltage knob (OVER) Can be set between −30% and 25% of the rated input. Undervoltage knob (UNDER) Can be set between −30% and 25% of the rated input. 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 8 mm max. For ferrules with insulating sleeves 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 Recommended: 0.49 N·m Maximum: 0.54 N·m 5 K8AB-PM ■ Operation and Setting Methods Connections 1. Input Connect to L1, L2, and L3 (for three-phase three-wire mode) or L1, L2, L3, and N (for three-phase fourwire 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. 2. Outputs Terminals 11, 12, and 14 are the output terminals for overvoltage (SPDT). Terminals 21, 22, and 24 are the output terminals for undervoltage, phase loss, and reversed phase (SPDT). N L1 L2 L3 Voltage input L1 L2 N L3 14 Signal output 12 11 Overvoltage 24 Signal output 22 Undervoltage Phase loss, reversed phase Load DIP Switch Settings 21 The power ON lock time, number of wires, and rated voltage are set using the DIP switch located on the bottom of the Unit. DIP Switch Functions ON K8AB-PM1 SWITCH OFF SW1 SW2 SW3 SW4 DIP switch Power ON lock time ON ● ↑ 3 2 1 5s OFF ❍ ↓ OFF --- --- --- ● 1s --- --- --- ❍ --- --- ● --- --- --- ❍ --- Number of wires Three-phase, four-wire Three-phase, three-wire Rated voltage 4 ON Three-phase, Three-phase, three-wire four-wire 240 V 138 V ● ● --- --- 230 V 133 V ● ❍ --- --- 220 V 127 V ❍ ● --- --- 200 V 115 V ❍ ❍ --- --- 3 2 1 5s OFF ❍ ↓ OFF --- --- --- ● 1s --- --- --- ❍ --- --- ● --- --- --- ❍ --- Note: All pins are set to OFF at the factory. K8AB-PM2 SWITCH Power ON lock time ON ● ↑ Number of wires Three-phase, four-wire Three-phase, three-wire Rated voltage 4 ON Three-phase, Three-phase, three-wire four-wire 480 V 277 V ● ● --- --- 415 V 240 V ● ❍ --- --- 400 V 230 V ❍ ● --- --- 380 V 220 V ❍ ❍ --- --- Note: All pins are set to OFF at the factory. 6 K8AB-PM Setting Method 1. Overvoltage The overvoltage knob (OVER) is used to set the overvoltage threshold. 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: K8AB-PM1 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 setting range is 140 to 250 V. 2. Undervoltage Undervoltage is set using the undervoltage knob (UNDER). The undervoltage can be set to between −30% and 25% 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 set the voltage. The rated input depends on the model and DIP switch setting. Example: K8AB-PM1 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 setting range is 140 to 250 V. 3. 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 (or drops lower than) the voltage setting, the alarm indicator will start flashing for the set period and then stay lit. Dimensions (Unit: mm) Three-phase Voltage with Phase-sequence, Phase-loss Relays K8AB-PM1 K8AB-PM2 22.5 5 100 90 72 5 7 K8AB-PM Questions and Answers Q Q Checking Operation How to Measure the Operating Time Overvoltage Change the input suddenly from 0% to 120% of the set value and measure the time until the Unit operates. Undervoltage Change the input suddenly from 120% to 0% of the set value and measure the time until the Unit operates. Operating Time Adjust the slide resistor so that the voltage applied to the K8AB terminals is 120% of the set value (for overvoltage detection) and 80% of the set value (for undervoltage detection) when the auxiliary relay operates, as shown in connection diagram 2. Close the switch and use the cycle counter to measure the operating time. Overvoltages Gradually increase the input from 80% of the setting. The input value will equal the operating value when the input exceeds the setting 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 setting 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: K8AB-PM@ output relays are normally operative. Connection Diagram 2 Operating set value L1 Input voltage V1 3φ, 200 VAC Flashing L2 L1 Lit R1 X/a Alarm indicator 5s X X/b V2 V3 L3 R2 L2 Relay output R1: Slide resistor 200 Ω 200 W R2: 100 Ω 400 W L3 Connection Diagram 1 Overvoltage L1 V1 3φ, 200 VAC ± L2 V2 V3 L1 C 200 V Cycle counter L3 0 to 150 V L2 Undervoltage L3 Q Three-phase variable autotransformer Checking the Phase Sequence and Phase Loss Operation Phase Sequence Switch the wiring, as shown by the dotted lines in connection diagram 1, to reverse the phase sequence and check that the K8AB operates. Phase loss Create a phase loss for any input phase and check that the K8AB operates. Q Operating Adjustment Knobs Use a screwdriver to turn the knobs. There is a stopper to prevent the knob from turning any further once it has been turned completely to the left or right. Do not force the knob past these limits. 8 K8AB-PM Questions and Answers Q Q Load-side Phase Loss In principle, phase loss cannot be detected on the load side because the K8AB-PM@ measures three-phase voltage to determine phase loss. Q Overvoltage Detection When Only One Phase Exceeds the Overvoltage Threshold The K8AB-PM@ monitors each of the three-phase voltages. This means an overvoltage is detected if even only one phase exceeds the threshold value. The same applies to undervoltages. Motor Load Phase Loss during Operation Motor load phase loss cannot be detected during operation. It can be used to detect phase loss at startup. 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 has been 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 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. To detect motor load phase loss during operation, use the undervoltage detection function to detect the motor terminal voltages at phase loss. 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 Voltage (as a percentage of rated voltage) Note: This characteristic curve shows the approximate values only. 100 95 90 VST 85 80 VTR 75 70 65 60 55 50 45 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. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. In the interest of product improvement, specifications are subject to change without notice. 9 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. Warranty and Limitations of Liability WARRANTY OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified) from date of sale by OMRON. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED. LIMITATIONS OF LIABILITY OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY. In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted. IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR. Application Considerations SUITABILITY FOR USE OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's application or use of the products. At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product, machine, system, or other application or use. The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses listed may be suitable for the products: • Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog. • Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety equipment, and installations subject to separate industry or government regulations. • Systems, machines, and equipment that could present a risk to life or property. Please know and observe all prohibitions of use applicable to the products. NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM. PROGRAMMABLE PRODUCTS OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof. Disclaimers CHANGE IN SPECIFICATIONS Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the products may be changed without any notice. When in doubt, special model numbers may be assigned to fix or establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual specifications of purchased products. DIMENSIONS AND WEIGHTS Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown. PERFORMANCE DATA Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and Limitations of Liability. ERRORS AND OMISSIONS The information in this document has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical, or proofreading errors, or omissions. 2008.12 In the interest of product improvement, specifications are subject to change without notice. OMRON Corporation Industrial Automation Company http://www.ia.omron.com/ (c)Copyright OMRON Corporation 2008 All Right Reserved.