Omron K8DT-AS Series Manual
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Omron K8DT-AS Series 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 Terminal that reduce wiring work.
The use of cage clamps enables wiring with bare stranded wires.
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.
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
Appearance
Model
Y92A-D1A
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
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
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.
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 Series

  • Page 1 K8DT-AS3CA 100 to 240 VAC Transistor 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.) Commercially Available CTs * OMRON CT Applicable CT current on secondary...

  • Page 2: Ratings And Specifications

    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: Terminal Diagram

    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: Setting Knobs

    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 Input Hysteresis (5% to 50% of operating value) Set value Set value...

  • Page 6: Operation Methods

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

  • Page 7: Operating Time

    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 Indicates a potentially hazardous !CAUTION 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 K8DT-AS 30.To prevent wiring materials from smoking or igniting, confirm wire Precautions for Safe Use ratings and use the wiring materials given in the following table. 1. Do not use or store the product in the following locations. Stripping length Recommended wire (Ferrules not used) •...

  • Page 12: Checking Connections

    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 Phoenix Contact 2,5 * SZF 0-0,4 × × 75 302 Wiha × AEF.2,5 Facom 210-719 Wago × × SDI 0.4 Weidmuller * OMRON's exclusive purchase model XW4Z-00B is available to × order as SZF 0-0,4 2,5 (manufactured by Phoenix Contact).
  • 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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