Datasheet

ManualsBrandsOmron Industrial Automation ManualsCurrent Monitoring RelaysCurrent Monitoring Relay 240V 1CO

New Product

Single-phase Current Relay

K8AK-AS

Ideal for Current Monitoring for

Industrial Facilities and Equipment.

• Monitor for overcurrents or undercurrents.

• Use commercially available CTs (CT current on secondary

side: 0 to 1 A or 0 to 5 A).

• Manual resetting and automatically resetting supported by one

Relay.

• Startup lock and operating time can be set separately.

• One SPDT output relay, 5 A at 250 VAC (resistive load).

• Output relay can be switched between normally open and

normally closed.

• Output status can be monitored using LED indicator.

• Inputs are isolated from the power supply.

Ordering Information

List of Models

*1 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

Accessory (Order Separately)

●OMRON CT ●Commercially Available CTs*

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

capacity of the K8AK-AS2.

Refer to Safety Precautions on page 9.

Refer to page 8 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 Model

2 to 20 mA AC/DC,

10 to 100 mA AC/DC,

50 to 500 mA AC/DC

24 VAC/DC K8AK-AS1 24 VAC/DC

100 to 240 VAC K8AK-AS1 100-240 VAC

0.1 to 1 A AC/DC,

0.5 to 5 A AC/DC,

0.8 to 8 A AC/DC

24 VAC/DC K8AK-AS2 24 VAC/DC

100 to 240 VAC K8AK-AS2 100-240 VAC

10 to 100 A AC*,

20 to 200 A AC*

24 VAC/DC K8AK-AS3 24 VAC/DC

100 to 240 VAC K8AK-AS3 100-240 VAC

Appearance Input range

Applicable

Relay

Model

10 to 100 A AC,

20 to 200 A AC

K8AK-AS3 K8AC-CT200L

Appearance

CT current on secondary

side

Applicable Relay

0 to 1 A AC,

0 to 5 A AC

K8AK-AS2

Summary of content (12 pages)

PAGE 1
New Product Single-phase Current Relay K8AK-AS Ideal for Current Monitoring for Industrial Facilities and Equipment. • Monitor for overcurrents or undercurrents. • Use commercially available CTs (CT current on secondary side: 0 to 1 A or 0 to 5 A). • Manual resetting and automatically resetting supported by one Relay. • Startup lock and operating time can be set separately. • One SPDT output relay, 5 A at 250 VAC (resistive load). • Output relay can be switched between normally open and normally closed.
PAGE 2
K8AK-AS Ratings and Specifications Input Range Range*1 Model K8AK-AS1 K8AK-AS2 K8AK-AS3 Connection terminal 0 to 20 mA AC/DC I1-COM 0 to 100 mA AC/DC I2-COM 0 to 500 mA AC/DC I3-COM Setting range 2 to 20 mA AC/DC, 10 to 100 mA AC/ DC, 50 to 500 mA AC/DC Input impedance Approx. 5 Ω Direct input Approx. 1 Ω Direct input Approx. 0.2 Ω Direct input Approx. 0.12 Ω (Load : 0.
PAGE 3
K8AK-AS Terminal wiring method Recommended wire Solid wire: 2.5 mm2 Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact Case color N1.5 Case material PC and ABS, UL 94 V-0 Weight Approx.
PAGE 4
K8AK-AS Connections Terminal Diagram K8AK-AS1 100-240VAC A B Control Output A Current Input A1 C A2 I1 I2 I3 AS2 AS1 C AS3 C C A2 A1 I1 I2 I3 I1 100 A max. 8 A max. 5 A max. 1 A max. 500 mA max. 24 VAC/DC A2 A1 20 mA max. 100 to 240 VAC 100 mA max. B Power Supply Voltage I2 I3 I1 CT 200 A max. Relay output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) I2 CT I3 Relay Output (No polarity) Common 11 11 Note: 1. 2. 3. 4. 5. 6.
PAGE 5
K8AK-AS Nomenclature ●Indicators Front Item Terminal block (See notes 1 and 2.) Current knob (SV) Power indicator Meaning Power indicator (PWR: Green) Lit when power is being supplied. Relay status indicator (RY: Yellow) Lit when relay is operating. Alarm indicator (ALM: Red) Lit when there is an overcurrent or undercurrent. The indicator flashes to indicate the error status after the input has exceeded the set value while the operating time is being clocked. Hysteresis knob (HYS.
PAGE 6
K8AK-AS Operation Methods Setting Ranges and Wiring Connections Model K8AK-AS1 K8AK-AS2 K8AK-AS3 Setting range 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 I1-COM 0.5 to 5 A AC/DC Direct input or commercially available CT 0.8 to 8 A AC/DC --- I3-COM 10 to 100 A AC* OMRON CT I2-COM 20 to 200 A AC* OMRON CT I3-COM Note: The DC input terminals have no polarity.
PAGE 7
K8AK-AS ●Operating Time The operating time is set using the operating time knob (T). The operating time can be set to between 0.1 and 30 s. 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 operating time. If the input current exceeds (drops lower than) the set value, the alarm indicator will start flashing for the set period and then stay lit.
PAGE 8
K8AK-AS 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 setting and check the operation using the same method as for overcurrent.
PAGE 9
K8AK-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 10
K8AK-AS 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 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.