Datasheet

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New Product

Single-phase Current Relay

K8DT-AS

Detect errors in motors and other equipment

through current changes.

Use in either overcurrent or undercurrent mode.

• 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).

• Settings for the operating value, hysteresis, startup lock time, and operating time.

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

• Push-In Plus Technology that reduce wiring work.

Double-insertion holes for crossover wiring (all terminals).

• UL listed for easy shipping to North America.

• Models added with transistor outputs for superior contact reliability.

• RoHS compliant.

Ordering Information

Single-phase Current Relay

The K8DT-AS3

is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

OMRON CT Commercially Available CTs *

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

capacity of the K8DT-AS2.

Options (Order Separately)

Front Cover

Refer to Safety Precautions on page 10.

Refer to page 9 for commonly asked questions.

For the most recent information on models

that have been certified for safety

standards, refer to your OMRON website.

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-AS1CD

Transistor: Open collector K8DT-AS1TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AS1CA

Transistor: Open collector K8DT-AS1TA

0.1 to 1 A AC/DC,

0.5 to 5 A AC/DC

24 VAC/DC

Relay: SPDT contact output K8DT-AS2CD

Transistor: Open collector K8DT-AS2TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AS2CA

Transistor: Open collector K8DT-AS2TA

10 to 100 A AC *,

20 to 200 A AC *

24 VAC/DC

Relay: SPDT contact output K8DT-AS3CD

Transistor: Open collector K8DT-AS3TD

100 to 240 VAC

Relay: SPDT contact output K8DT-AS3CA

Transistor: Open collector K8DT-AS3TA

Appearance Input range

Applicable

Relay

Model

10 to 100 A AC,

20 to 200 A AC

K8DT-AS3

K8AC-CT200L

Appearance

CT current on secondary

side

Applicable Relay

0 to 1 A AC,

0 to 5 A AC

K8DT-AS2

Appearance Model

Y92A-D1A

Summary of content (16 pages)

PAGE 1
New Product Single-phase Current Relay K8DT-AS Detect errors in motors and other equipment through current changes. Use in either overcurrent or undercurrent mode. • 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). • Settings for the operating value, hysteresis, startup lock time, and operating time. • Width of 17.5 mm to reduce space required in panels. • Push-In Plus Technology that reduce wiring work.
PAGE 2
K8DT-AS Ratings and Specifications Input Range Model K8DT-AS1@@ Range *1 Connection terminal Setting range Input impedance Input type 20 mA AC/DC I1-COM 2 to 20 mA AC/DC Approx. 5  Direct input 100 mA AC/DC I2-COM 10 to 100 mA AC/DC Approx. 1  Direct input 500 mA AC/DC I3-COM 50 to 500 mA AC/DC Approx. 0.2  Direct input 1 A AC/DC I1-COM 0.1 to 1 A AC/DC Approx. 0.12  (Load: 0.5 VA) 5 A AC/DC I2-COM 0.5 to 5 A AC/DC Approx. 0.02  (Load: 1.
PAGE 3
K8DT-AS Ratings Specifications Power supply voltage K8DT-AS@@D: 24 VAC 50/60 Hz, 24 VDC K8DT-AS@@A: 100 to 240 VAC 50/60 Hz Allowable operating voltage range 85% to 110% of power supply voltage Power consumption 24 VAC/DC: 1.8 VA/1 W max. 100 to 240 VAC: 2.5 VA max.
PAGE 4
K8DT-AS Connections Terminal Diagram K8DT-AS1 C A (3) Power Supply Voltage (1) (2) (3) A: 100 to 240 VAC (1) Current Input AS2 AS1 AS3 A1 A2 I3 C I1 I2 A1 A2 D: 24 VAC/DC A1 A2 (No polarity) 100mA max. 100A max. 20mA max. 5A max. CT 200A max. 500mA max. I3 C I1 I2 1A max. I3 I1 CT C I3 I2 I1 (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-AS Timing Charts Overcurrent Operation Diagram (Output Drive Method: Normally Open) Undercurrent Operation Diagram (Output Drive Method: Normally Closed) DIP switch setting: SW3 OFF, SW4 OFF DIP switch setting: SW3 ON, SW4 ON Power supply voltage Hysteresis (5% to 50% of operating value) Power supply voltage Input Hysteresis (5% to 50% of operating value) Set value Set value Input Flashing Lit Delay time: 250 ms (reference value) Delay time: 250 ms (reference value) Alarm indicator Flashin
PAGE 6
K8DT-AS Operation Methods Setting Ranges and Wiring Connections Model Setting range K8DT-AS1 Wiring connections Input type 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 I1-COM 0.5 to 5 A AC/DC Direct input or commercially available CT 10 to 100 A AC * OMRON CT I2-COM 20 to 200 A AC * OMRON CT I3-COM K8DT-AS2 Note: The DC input terminals have no polarity.
PAGE 7
K8DT-AS Setting Method Setting Current The current knob (SV) is 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-AS Dimensions (Unit: mm) Single-phase Current Relays K8DT-AS1 K8DT-AS2 K8DT-AS3 90 86 17.5 100 5 90 OMRON CT 9.3 9.3 1.7 1.7 K8AC-CT200L 11 4.7 63 54 Four M4 × 6 screws 20 17 50 8.5 Mounting Hole Dimensions 13.5 Two M5 screw holes or two 5.5-dia. holes 34.5 81.5 76 33.5 6 57 14.5 30 dia. 14.5 86 5.2 10 10 Note: The OMRON Current Transformer (CT) is designed to be used with the K8DT-AS3. Use terminals k and l for connections. (Terminals kt and lt are not used.) 20 1.8 4.
PAGE 9
K8DT-AS Questions and Answers Q Checking Operation 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 setting and check the operation using the same method as for overcurrent.
PAGE 10
K8DT-AS 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-AS 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 Stripping length Recommended wire Without Ferrules With Ferrules • Outdoor locations or under direct sunlight • Locations subject to dust or corrosive gases (sulfurizing gases, ammonia gases, etc.
PAGE 12
K8DT-AS Screw Mounting Connecting Stranded Wires 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. 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-AS Recommended Ferrules and Tools EN/IEC Standard Compliance Recommended ferrules Wire (mm2) (AWG) 0.25 Recommended ferrules Ferrule length (mm) 24 Manufactured Manufactured Manufactured by Phoenix by by Wago Contact Weidmuller 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 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 16
OMRON Corporation Industrial Automation Company Authorized Distributor: Kyoto, 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 2895 Greenspoint Parkway, Suite 200 Hoffman Estates, IL 60169 U.S.A. Tel: (1) 847-843-7900/Fax: (1) 847-843-7787 OMRON ASIA PACIFIC PTE. LTD. No.