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Three-phase Voltage Relay
K8AB-PW
CSM_K8AB-PW_DS_E_2_1
Ideal for monitoring 3-phase power supplies for industrial facilities and equipment.
* 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, 6 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.
Refer to Safety Precautions for the K8AB Series. Refer to page 9 for the Q&A section.
Model Number Structure
Model Number Legend
K8AB-@@
1 23
1. Basic Model K8AB: Measuring and Monitoring Relays 2. Functions PW: Three-phase Voltage 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
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K8AB-PW
Ordering Information
List of Models
Three-phase Voltage Relay Rated input (See note 2.) 3-phase 3-wire mode 200, 220, 230, 240 VAC Model K8AB-PW1
3-phase 4-wire mode
115, 127, 133, 138 VAC
3-phase 3-wire mode
380, 400, 415, 480 VAC
K8AB-PW2
3-phase 4-wire mode
220, 230, 240, 277 VAC
Note: 1. Three-phase, three-wire or four-wire and the input range are switched using a DIP switch. 2. The power supply voltage is the same as the rated input voltage.
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K8AB-PW
Ratings and Specifications
Ratings
Rated input voltage K8AB-PW1 K8AB-PW2 Input load Operating value setting range (OVER, UNDER) Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC K8AB-PW1: 25 VA max. K8AB-PW2: 45 VA max. 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. 100% operation at set value 5% of operating value (fixed) Automatic reset Overvoltage and undervoltage: 0.1 to 30 s 1 s or 5 s (Switched using DIP switch.) Power (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red Two SPDT relays (NC operation) Rated load Resistive load 6 A at 250 VAC (cos = 1) 6 A at 30 VDC (L/R = 0 ms) Inductive load 1 A at 250 VAC (cos = 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 -20 to 60C (with no condensation or icing) -40 to 70C (with no condensation or icing) 25% to 85% (with no condensation) 25% to 85% (with no condensation) 2,000 m max. 0.49 N*m 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 Munsell 5Y8/1 ABS resin (self-extinguishing resin) UL94-V0 Approx. 130 g Mounted to DIN Track or via M4 screws (tightening torque: 1.2 N*m) 22.5 (W) x 90 (H) x 100 (D) mm
Operating value Reset value Reset method Operating time setting range (T) Startup lock time (LOCK) Indicators Output relays Output relay ratings
Ambient operating temperature Storage temperature Ambient operating humidity Storage humidity Altitude Terminal screw tightening torque Terminal wiring method
Case color Case material Weight Mounting Dimensions
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K8AB-PW
Specifications
Input frequency range Overload capacity Setting error Operating value Operating time Startup lock time Repeat error Operating value Set value 0.5 s Operating value 2% Error calculation: Error = ((Maximum operating value - Minimum operating value (over 10 operations))/2)/ Average value x 100% 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 x 100% 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 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%.) Operating value Drift based on measured value at standard temperature: -20C to standard temperature: 1,000 ppm/C max. Standard temperature to 60C : 1,000 ppm/C max. (Humidity: 25% to 80%) Operating time Fluctuation based on measured value at standard temperature: -20C to standard temperature: 10% max. Standard temperature to 60C : 10% max. (Humidity: 25% to 80%) 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. At 45 to 65 Hz Operating value 5% Operating time 10% Note: The error in the operating value and operating time under standard conditions. EN60255-5 and EN60255-6 Installation environment (Pollution Degree 2, Overvoltage Category III) EN61326 UL508 20 M 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 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 1,500 V power supply terminal common/normal mode Square-wave noise of 1 s/100 ns pulse width with 1-ns rise time 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 100 m/s2, 3 times each in 6 directions along three axes (up/down, left/right, forward/backward) Terminal section: Finger protection 45 to 65 Hz Continuous input: 115% of maximum input, 10 s max.: 125% of maximum input Set value 10% of rated input voltage
Reset value
Operating time
Startup lock time
Temperature influence
Humidity influence
Influence of input frequency
Applicable standards
Conforming standards EMC Safety standards
Insulation resistance
Dielectric strength
Noise immunity Vibration resistance Shock resistance Degree of protection
Note: The reset value is valid only for automatic resets.
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K8AB-PW
Connections
Wiring Diagram
Overvoltage and Undervoltage Operation Diagram
Overvoltage setting value
N L1 L2 L3
Hysteresis: Fixed at 5% Hysteresis: Fixed at 5%
Flashing
Undervoltage setting value
L1 Input L2 L3
Voltage input
L1 L2 L3 N
Overvoltage alarm indicator Undervoltage alarm indicator Overvoltage relay Undervoltage relay Flashing Lit
Lit
T
T: Operating time (0.1 to 30 s)
T1: Power ON lock (1 s or 5 s)
T
T: Operating time (0.1 to 30 s)
14 Signal output 12
11
Overvoltage alarm
T1
Note: 1. K8AB-PW output relay is normally operative. 2. The power ON lock function prevents unnecessary alarms from being generated during the unstable period when the power is first turned ON. There is no relay output during timer operation. 3. L1 and L2 use the same power supply and will not operate due to an undervoltage if they drop below the rated input of 60%.
24 Signal output 22
21
Undervoltage alarm
Load
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K8AB-PW
Nomenclature
Front
Terminal block (See notes 1 and 2.)
Indicators
Item Power indicator (PWR: Green) Relay status indicator (RY: Yellow)
Overvoltage knob (OVER)
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.
Power indicator Relay status indicator Alarm indicator Undervoltage knob (UNDER)
Alarm indicator (ALM: Red)
Overvoltage: Red
Operating time knob (T)
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.
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.
Terminal block (See notes 1 and 2.)
Setting Knobs
Item Usage Overvoltage knob (OVER) Can be set between -30% and 25% of the rated input. Undervoltage knob (UNDER) Operating time knob (T) Can be set between -30% and 25% of the rated input. 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 insulating sleeves
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 Recommended: 0.49 N*m Maximum: 0.54 N*m
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K8AB-PW
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 (SPDT).
N L1 L2 L3
Voltage input
L1 L2 L3 N
14 Signal output 12
11
Overvoltage alarm
24 Signal output 22
21
Undervoltage alarm
Load
DIP Switch Settings
The Startup 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-PW1
SWITCH ON
OFF
4
ON
3
2
1
SW1 SW2 SW3 SW4
DIP switch
Power ON lock time 5 s 1s Number of wires Rated voltage
OFF OFF ---------
---------
----
-----
Three-phase, four-wire Three-phase, three-wire Three-phase, Three-phase, three-wire four-wire 240 V 230 V 220 V 200 V 138 V 133 V 127 V 115 V

---------
---------
Note: All pins are set to OFF at the factory.
K8AB-PW2
SWITCH ON
4
ON
3
2
1
Power ON lock time 5 s 1s Number of wires Rated voltage
OFF OFF ---------
---------
----
-----
Three-phase, four-wire Three-phase, three-wire Three-phase, Three-phase, three-wire four-wire 480 V 415 V 400 V 380 V 277 V 240 V 230 V 220 V

---------
---------
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Note: All pins are set to OFF at the factory.
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K8AB-PW
Setting Method
1. 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: K8AB-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 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-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 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 current. 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
Three-phase Voltage Relays
22.5 100 5
(Unit: mm)
K8AB-PW1 K8AB-PW2
90
72
5
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K8AB-PW
Questions and Answers
Q
Checking Operation
Q
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 overvoltage set value or 80% of the undervoltage set value when the auxiliary relay operates in a test circuit. Close the switch and use the cycle counter to measure the operating time.
Overvoltage 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-PW@ output relays are normally operative.
Set value Input voltage
Flashing
Connection Diagram
L1
3, 200 VAC L1
V1
L2 R1 X/b
Lit
V2 V3
L3
Alarm indicator Relay output
X
5s
L2
X/a
R2 R1: Slide resistor 200 200 W R2: 100 400 W
L3
Connection Diagram
Overvoltage L1 L2
V1
3, 200 VAC L1 L2 Undervoltage L3 Three-phase variable autotransformer
C 200 V
Cycle counter
V2 V3
L3
0 to 150 V
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.
Q
Overvoltage Detection When Only One Phase Exceeds the Overvoltage Threshold The K8AB 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.
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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.
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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.
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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.
2009.11 In the interest of product improvement, specifications are subject to change without notice.
Industrial Automation Company
http://www.ia.omron.com/
OMRON Corporation
(c)Copyright OMRON Corporation 2009 All Right Reserved.

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