Omron K8DT-AS Seriesl Manual
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Omron K8DT-AS Seriesl Manual

Single-phase current relay
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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.
Refer to Safety Precautions on page 10.
Refer to page 9 for commonly asked questions.
Ordering Information
Single-phase Current Relay
Setting range
2 to 20 mA AC/DC,
10 to 100 mA AC/DC,
50 to 500 mA AC/DC
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC
10 to 100 A AC *,
20 to 200 A AC *
* 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
Applicable
Appearance
Input range
10 to 100 A AC,
K8DT-AS3
20 to 200 A AC
Options (Order Separately)
Front Cover
Power supply voltage
24 VAC/DC
100 to 240 VAC
24 VAC/DC
100 to 240 VAC
24 VAC/DC
100 to 240 VAC
Model
Relay
K8AC-CT200L
Output
Relay: SPDT contact output
Transistor: Open collector
Relay: SPDT contact output
Transistor: Open collector
Relay: SPDT contact output
Transistor: Open collector
Relay: SPDT contact output
Transistor: Open collector
Relay: SPDT contact output
Transistor: Open collector
Relay: SPDT contact output
Transistor: Open collector
Commercially Available CTs *
CT current on secondary
Appearance
0 to 1 A AC,
0 to 5 A AC
* If you use a commercially available CT, do not exceed the overload
capacity of the K8DT-AS2.
Appearance
Model
Y92A-D1A
For the most recent information on models
that have been certified for safety
standards, refer to your OMRON website.
Model
K8DT-AS1CD
K8DT-AS1TD
K8DT-AS1CA
K8DT-AS1TA
K8DT-AS2CD
K8DT-AS2TD
K8DT-AS2CA
K8DT-AS2TA
K8DT-AS3CD
K8DT-AS3TD
K8DT-AS3CA
K8DT-AS3TA
Applicable Relay
side
K8DT-AS2
1

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Summary of Contents for Omron K8DT-AS Seriesl

  • Page 1 K8DT-AS3CA 100 to 240 VAC Transistor: Open collector K8DT-AS3TA * 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 * Applicable CT current on secondary...
  • Page 2 1 s at 600% * CT capacity on primary side. *1. The range is selected using connected terminals. *2. The K8DT-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

  • Page 3: Specifications

    0.5 to 5 A AC/DC (Compatible with OMRON CT (K8AC-CT200L) commercially available CTs.) Note: Overload capacity of primary side of CT. K8DT-AS3: When used with the OMRON CT 0.5% full scale (at 25C and 65% humidity, rated Operating (K8AC-CT200L). value...

  • Page 4: Wiring Example

    3. For the current input, you can input only from the C terminal and one other terminal. 4. Refer to Setting Ranges and Wiring Connections on the I1, I2, and I3 current input terminals. 5. The K8DT-AS3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT). Wiring Example...

  • Page 5: Timing Charts

    K8DT-AS Timing Charts Overcurrent Operation Diagram Undercurrent Operation Diagram (Output Drive Method: Normally Open) (Output Drive Method: Normally Closed) DIP switch setting: SW3 OFF, SW4 OFF DIP switch setting: SW3 ON, SW4 ON Power supply Power supply voltage voltage Hysteresis Input (5% to 50% of operating value) Hysteresis (5% to 50% of operating value)

  • Page 6: Dip Switch Settings

    K8DT-AS3 For the K8DT-AS3, the I1 terminal is not used. For the K8DT-AS2, the I3 terminal is not used. If using the OMRON K8AC-CT200L CT, connect to terminals k and l on the K8AC-CT200L. Power supply (Terminals kt and lt are not used.)

  • Page 7: Setting Method

    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.
  • Page 8 34.5 81.5 33.5 30 dia. 14.5 14.5 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.) Options (Order Separately) Front Cover Y92A-D1A 52.7...

  • Page 9: Questions And Answers

    K8DT-AS Questions and Answers Checking Operation Can a motor with a rated current of 5 A be monitored using the K8DT? Overcurrents Are there any application precautions? Gradually increase the input from 80% of the set value. The input will equal the operating value when the input The K8DT-AS1 and K8DT-AS2 cannot be used with motor exceeds the set value and the alarm indicator starts flashing.

  • Page 10: Safety Precautions

    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 CAUTION in minor or moderate injury or in property Doing so may occasionally result in minor injury due damage.

  • Page 11: Precautions For Safe Use

    K8DT-AS 30.To prevent wire materials from smoking or igniting, use the wiring Precautions for Safe Use materials given in the following table. 1. Do not use or store the product in the following locations. Stripping length • Locations subject to water, or oil Recommended wire Without With Ferrules...
  • 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 Use the following procedure to connect the wires to the terminal block. you hear them click in place. 1.
  • Page 13 The following table shows manufacturers and models as of 2015/Dec. Side Front Not isolated 2.5 mm dia. Reinforced insulation (Double insulation) 0.4 mm 2.5 mm Model Manufacturer XW4Z-00B Omron ESD0.40X2.5 Wera SZF 0.4X2.5 Phoenix Contact 0.4X2.5X75 302 Wiha AEF.2.5X75 Facom 210-719 Wago SDI 0.4X2.5X75...
  • Page 14 MEMO...

  • Page 15: Terms And Conditions Agreement

    Data presented in Omron Company websites, catalogs and other materials 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 user must correlate it to actual application requirements.
  • Page 16 The Netherlands Hoffman Estates, IL 60169 U.S.A. Tel: (31)2356-81-300/Fax: (31)2356-81-388 Tel: (1) 847-843-7900/Fax: (1) 847-843-7787 © OMRON Corporation 2016 All Rights Reserved. OMRON (CHINA) CO., LTD. OMRON ASIA PACIFIC PTE. LTD. In the interest of product improvement, Room 2211, Bank of China Tower, No.

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