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New Product

Phase-sequence Phase-loss Relay

K8AK-PH

Three-phase Phase-sequence Phase-loss

Relay Using Voltage Detection Method

• Greater resistance to inverter noise.

• Distinguishes between correct phases, phase sequence, and phase

loss when power is turned ON.

• Supports phase loss detection when the motor is operating.

• 5 A (resistive load) at 250 VAC, DPDT x 1.

• Output status can be monitored using LED indicator.

• Ideal to prevent reverse operation of motors.

Ordering Information

List of Models

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

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.

Function Rated input voltage* Relay output Model

Phase sequence and phase loss

monitoring

3-phase, 3-wire 200 to 480 VAC DPDT ×1 K8AK-PH1

Summary of content (12 pages)

PAGE 1
New Product Phase-sequence Phase-loss Relay K8AK-PH Three-phase Phase-sequence Phase-loss Relay Using Voltage Detection Method • Greater resistance to inverter noise. • Distinguishes between correct phases, phase sequence, and phase loss when power is turned ON. • Supports phase loss detection when the motor is operating. • 5 A (resistive load) at 250 VAC, DPDT x 1. • Output status can be monitored using LED indicator. • Ideal to prevent reverse operation of motors. Refer to Safety Precautions on page 8.
PAGE 2
K8AK-PH Ratings and Specifications Ratings Rated input voltage Input load Operating time 2 3-phase, 200 to 480 VAC (3-wire) Approx. 4.1 VA Phase sequence 0.1 s±0.05 s Phase loss 0.1 s max.
PAGE 3
K8AK-PH Specifications Input voltage range 200 to 480 VAC Input frequency 50/60 Hz (no presumed range) Overload capacity Continuous 528 V Phase loss detection level 80%±10% of rated input Calculation Formula = 1 − ((Highest phase-to-phase voltage − Lowest phase-to-phase voltage)/Average threephase phase-to-phase voltage) Applicable standards Conforming standards EN 60947-5-1 Installation environment (pollution level 2, installation category III) EMC EN 60947-5-1 Safety standards UL 508 (Recogn
PAGE 4
K8AK-PH Connections Terminal Diagram Control Output Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) L1 L2 Input voltage L3 3-phase, 3-wire power supply Relay Output 21 24 22 L1 L2 L3 Phase-to-phase voltage: 200 to 480 VAC 11 12 21 24 22 11 12 14 14 Note: 1. Use the recommended ferrules if you use twisted wires.
PAGE 5
K8AK-PH Nomenclature Front ●Indicators Terminal block (See notes 1 and 2.) Power indicator Relay status indicator Item Meaning Power indicator (PWR: Green) Lit when power is being supplied *3. Relay status indicator (RY: Yellow) Lit when relay is operating (normally lit). * 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. Note: 1. Use either a solid wire of 2.
PAGE 6
K8AK-PH Dimensions (Unit: mm) Three-phase Phase-sequence Phase-loss Relay K8AK-PH1 22.5 100 90 72 5 Optional Parts for DIN Track Mounting ●DIN Tracks PFP-100N PFP-50N 7.3±0.15 4.5 35±0.3 15 25 10 25 25 1,000 (500)* 10 25 15 (5)* 27±0.15 1 *Dimensions in parentheses are for the PFP-50N.
PAGE 7
K8AK-PH Questions and Answers Q Checking Operation Phase Sequence Switch the wiring, as shown by the dotted lines in the connection diagram, to reverse the phase sequence and check that the K8AK operates. Phase Loss Create a phase loss for any input phase and check that the K8AK operates.
PAGE 8
K8AK-PH 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 9
K8AK-PH 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 10
MEMO 10
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.