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NEW Product

Three-phase Voltage Relay

K8AK-PW

Ideal for Monitoring 3-phase Power

Supplies for Industrial Facilities and

Equipment.

• Greater resistance to inverter noise.

• 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, 5 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.

Ordering Information

List of Models

Note: Three-phase, three-wire or four-wire and the input range are switched using a DIP switch.

* The power supply voltage is the same as the rated input voltage.

●Single K8AK Monitors 3-phase Power Supply with 3 or 4 Wires

Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings.

A Single K8AK Can Monitor a 3-phase Power Supply Anywhere in the World

Reduces Maintenance Parts Inventory

Refer to Safety Precautions on page 9.

Refer to 8 for commonly asked questions.

For the most recent information on models that have been certified for

safety standards, refer to your OMRON website.

Rated input* Model

3-phase 3-wire mode 200, 220, 230, 240 VAC K8AK-PW1

3-phase 4-wire mode 115, 127, 133, 138 VAC

3-phase 3-wire mode 380, 400, 415, 480 VAC K8AK-PW2

3-phase 4-wire mode 220, 230, 240, 277 VAC

SW3 ON OFF ON OFF

SW4 ON ON OFF OFF

K8AK-PW1

SW2

ON P-N 138 V 133 V 127 V 115 V

OFF P-P 240V 230 V 220 V 200 V

K8AK-PW2

SW2

ON P-N 277 V 240 V 230 V 220 V

OFF P-P 480 V 415 V 400 V 380 V

Phase to phase voltage (3 wires)

Phase to neutral voltage (4 wires)

L1 L2 L3 L1 L2 L3 N

400VAC

230VAC

Summary of content (12 pages)

PAGE 1
NEW Product Three-phase Voltage Relay K8AK-PW Ideal for Monitoring 3-phase Power Supplies for Industrial Facilities and Equipment. • Greater resistance to inverter noise. • 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, 5 A at 250 VAC (resistive load). Separate outputs possible for overvoltages and undervoltages.
PAGE 2
K8AK-PW Ratings and Specifications Ratings Rated input voltage 2 K8AK-PW1 Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC K8AK-PW2 Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC Input load K8AK-PW1: Approx. 4.4 VA K8AK-PW2: Approx. 4.
PAGE 3
K8AK-PW Specifications Input frequency range 50/60 Hz Overload capacity Continuous input at 115% of maximum input. 10 s at 125%. (up to 600 VAC) Repeat accuracy Applicable standards Operating value ±0.
PAGE 4
K8AK-PW Connections Terminal Diagram Control Output Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) 21 24 22 L1 L2 L3 Input Voltages Relay Output L1 Undervoltage 21 24 L2 L3 3-phase, 3-wire power supply 22 or N _ _ L1 L2 L3 N _ _ 3-phase, 4-wire power supply Relay Output 11 12 Monitoring 3-phase, 3-wire Power Supply N _ _ 11 12 14 Overvoltage 14 Note: 1. Do not connect anything to terminals that are shaded in gray. 2.
PAGE 5
K8AK-PW Nomenclature ●Indicators Front Item Terminal block (See notes 1 and 2.) Overvoltage knob (OVER) Power indicator Undervoltage knob (UNDER) 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 when there is an overvoltage. The indicator flashes to indicate the error status after the overvoltage has exceeded the set value while the operating time is being clocked.
PAGE 6
K8AK-PW Operation Methods Connections ●Input N L1 L2 L3 Connect to L1, L2, and L3 (for three-phase three-wire mode) or L1, L2, L3, and N (for three-phase four-wire 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.
PAGE 7
K8AK-PW Setting Method ●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.
PAGE 8
K8AK-PW Questions and Answers Q Q Checking Operation Overvoltage Gradually increase the input from 80% of the set value. The input value will equal the operating value when the input exceeds the set value 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 set value and check the operation using the same method as for overvoltage.
PAGE 9
K8AK-PW 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.
PAGE 10
K8AK-PW 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.
PAGE 11
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).
PAGE 12
OMRON Corporation Industrial Automation Company Authorized Distributor: Tokyo, JAPAN Contact: www.ia.omron.com Regional Headquarters OMRON EUROPE B.V. Wegalaan 67-69-2132 JD Hoofddorp The Netherlands Tel: (31)2356-81-300/Fax: (31)2356-81-388 OMRON ELECTRONICS LLC One Commerce Drive Schaumburg, IL 60173-5302 U.S.A. Tel: (1) 847-843-7900/Fax: (1) 847-843-7787 OMRON ASIA PACIFIC PTE. LTD. No.