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New Product

Single-Phase Overcurrent/Undercurrent Relay

K8DT-AW

Detect errors in motors and other equipment

through current changes.

Monitor for overcurrents and undercurrents

simultaneously with one Relay.

• Monitor AC or DC currents with one Relay.

• Use with commercially available CTs (CT secondary side: 0 to 1 A or 0 to 5 A).

• Width of 17.5 mm to reduce space required in panels.

• Push-In Plus Terminal Blocks that reduce wiring work.

•

Models added with transistor outputs for superior contact reliability.

Ordering Information

Single-phase Overcurrent /Undercurrent Relay

The K8DT-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is

not possible.)

Refer to Safety Precautions on page 10.

Refer to page 9 for commonly asked questions.

Setting range Power supply voltage Output Model

2 to 20 mA AC/DC

10 to 100 mA AC/DC

50 to 500 mA AC/DC

24 VAC/DC

Relay: SPDT contact output K8DT-AW1CD

Transistor: NPN output K8DT-AW1TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AW1CA

Transistor: NPN output K8DT-AW1TA

0.1 to 1 A AC/DC

0.5 to 5 A AC/DC

24 VAC/DC

Relay: SPDT contact output K8DT-AW2CD

Transistor: NPN output K8DT-AW2TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AW2CA

Transistor: NPN output K8DT-AW2TA

10 to 100 A AC *

20 to 200

A AC *

24 VAC/DC

Relay: SPDT contact output K8DT-AW3CD

Transistor: NPN output K8DT-AW3TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AW3CA

Transistor: NPN output K8DT-AW3TA

For the most recent information on models

that have been certified for safety

standards, refer to your OMRON website.

Accessories (Order Separately)

OMRON Current Transformer

Commercially Available Current

Front Cover

ansformers*

* If you use a commercially available CT, do not exceed the overload

capacity of the K8DT-AS2.

Appearance

Input range

Applicable

Relay

Model

10 to 100 A AC,

20 to 200 A AC

K8DT-AS3 K8AC-CT200L

Y92A-D1A

Appearance

CT current on

secondary side

Applicable Relay

0 to 1 A AC,

0 to 5 A AC

K8DT-AS2

Summary of content (16 pages)

PAGE 1
New Product Single-Phase Overcurrent/Undercurrent Relay K8DT-AW Detect errors in motors and other equipment through current changes. Monitor for overcurrents and undercurrents simultaneously with one Relay. • Monitor AC or DC currents with one Relay. • Use with commercially available CTs (CT secondary side: 0 to 1 A or 0 to 5 A). • Width of 17.5 mm to reduce space required in panels. • Push-In Plus Terminal Blocks that reduce wiring work.
PAGE 2
K8DT-AW Ratings and Specifications Input Range Model K8DT-AW1 K8DT-AW2 K8DT-AW3 Range * 1 Connection terminals Setting range Input impedance 0 to 20 mA AC/DC I1-COM 2 to 20 mA AC/DC Approx. 5 Ω 0 to 100 mA AC/DC I2-COM 10 to 100 mA AC/DC Approx. 1 Ω 0 to 500 mA AC/DC I3-COM 50 to 500 mA AC/DC Approx. 0.2 Ω 0.1 to 1 A AC/DC Approx. 0.12 Ω (Load: 0.5 VA) Approx. 0.02 Ω (Load: 1.5 VA) 0 to 1 A AC/DC I1-COM 0 to 5 A AC/DC I2-COM 0.
PAGE 3
K8DT-AW Ratings Power supply voltage K8DT-AW K8DT-AW Power consumption 24 VAC/24 VDC: 1.8 VA/1 W max. 100 to 240 VAC: 2.5 VA max. Rated insulation voltage 600 VAC Operating value setting range (AL1, AL2) 10% to 100% of the maximum value of the setting range K8DT-AW1: 2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC K8DT-AW2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.) 0.5 to 5 A AC/DC (Compatible with commercially available CTs.
PAGE 4
K8DT-AW Connections Terminal Diagram K8DT-AW1 C A (1) (3) Power Supply Voltage (2)(3) A: 100 to 240 VAC (1) Current Input AW2 AW1 AW3 A1 A2 I3 C I1 I2 A1 D: 24 VAC/DC A2 A1 A2 (No polarity) 100 mA max. 20 mA max. 5 A max. 100 A max. CT 500 mA max. 1 A max. 200 A max. CT I3 C I1 I2 C I1 I3 I2 (2) Output C DIP SW I2 12 14 C: Relay Output T: Transistor Output 12 14 11 11 14 11 Inside Inside Note: 1. 2. 3. 4. 5.
PAGE 5
K8DT-AW Timing Charts Overcurrent and Undercurrent Operation Diagram DIP switch settings: SW3 ON and SW4 ON, or SW3 OFF and SW4 OFF Power supply voltage Overcurrent set value (AL1) Undercurrent set value (AL2) Delay time: 250 ms (reference value) Input Hysteresis: Fixed at 5% Hysteresis: Fixed at 5% Flashing AL1 alarm indicator Flashing AL2 alarm indicator Contacts 11-14 or transistor output LOCK Lit t Lit Delay time: 250 ms (reference value) t: Operating time (0.
PAGE 6
K8DT-AW Operation Methods Setting Ranges and Wiring Connections Input type Wiring connections 2 to 20 mA AC/DC Direct input I1-COM 10 to 100 mA AC/DC Direct input I2-COM 50 to 500 mA AC/DC Direct input I3-COM 0.1 to 1 A AC/DC Direct input or commercially available CT I1-COM 0.
PAGE 7
K8DT-AW Setting Method Setting Current The current knobs (AL1, AL2) are used to set the current. The current can be set to 10% to 100% of the maximum setting range. 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. The maximum setting range will differ depending on the model and the input terminal.
PAGE 8
K8DT-AW Dimensions (Unit: mm) Single-phase Overcurrent/Undercurrent Relay K8DT-AW1 K8DT-AW2 K8DT-AW3 90 86 17.5 OMRON CT 9.3 9.3 1.7 K8AC-CT200L 5 90 1.7 63 54 11 4.7 Four M4 × 6 screws 50 8.5 20 17 Mounting Hole Dimensions 13.5 34.5 Two M5 screw holes or two 5.5-dia. holes 81.5 76 33.5 6 57 14.5 30 dia. 14.5 86 Note: The OMRON Current Transformer (CT) is designed to be used with the K8DT-AW3. Use terminals k and l for connections. (Terminals kt and lt are not used.) 5.
PAGE 9
K8DT-AW Questions and Answers Checking Operation Q Overcurrents Gradually increase the input from 80% of the set value. The input 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 outputs that will start after the operating time has passed. Undercurrent Gradually decrease the input from 120% of the set value and check the operation using the same method as for overcurrent.
PAGE 10
K8DT-AW 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 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.
PAGE 11
K8DT-AW Precautions for Safe Use 30.To prevent wire materials from smoking or igniting, use the wiring materials given in the following table. 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 (sulfurizing gases, ammonia gases, etc.
PAGE 12
K8DT-AW Screw Mounting 1. Pull out the two hooks on the back of the Relay to the outside until you hear them click in place. 2. Insert M3 screws into the hook holes and secure the Relay. Mounting Hole Dimensions (1) Two M3 screw holes or two 3-dia. holes (2) Connecting Stranded Wires Use the following procedure to connect the wires to the terminal block. 1. Hold a flat-blade screwdriver at an angle and insert it into the release hole. The angle should be between 10° and 15°.
PAGE 13
K8DT-AW Recommended Ferrules and Tools EN/IEC Standard Compliance Recommended Ferrules Wire (mm2) (AWG) Recommended ferrules Ferrule length (mm) Manufactured Manufactured Manufactured by Phoenix by by Wago Contact Weidmuller 0.25 24 8 AI0.25-8 H0.25/12 FE-0.25-8N-YE 0.34 22 8 AI0.34-8 H0.34/12 FE-0.34-8N-TQ 0.5 20 8 AI0.5-8 H0.5/14 FE-0.5-8N-WH 0.75 18 8 AI0.75-8 H0.75/14 FE-0.75-8N-GY 1 18 8 AI1-8 H1.0/14 FE-1.0-8N-RD 1.5 16 8 AI1.5-8 H1.5/14 FE-1.
PAGE 14
MEMO 14
PAGE 15
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”).
PAGE 16
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