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Phase-sequence Phase-loss Relay

K8DS-PH

Three-phase Phase-sequence Phase-loss

Relay Using Voltage Detection Method

• Lineup includes a 17.5-mm slim, compact model.

• Greater resistance to inverter noise.

• Distinguishes between correct phases, phase sequence, and phase

loss when power is turned ON.

• Supports phase loss detection when the motor is operating.

• Output status can be monitored using LED indicator.

•Ideal to prevent reverse operation of motors.

Ordering Information

List of Models

* The power supply voltage is the same as the rated input voltage.

Refer to Safety Precautions on page 8.

Refer to page 7 for commonly asked questions.

For the most recent information on models that have been

certified for safety standards, refer to your OMRON website.

Function Rated input voltage* Relay output Model

Phase sequence and phase

loss monitoring

3-phase, 3-wire 200 to 480

VAC SPDT × 1 K8DS-PH1

K8DS-PH

Ratings and Specifications

Ratings

Rated input voltage 3-phase, 200 to 480 VAC (3-wire)

Input load Approx. 2.7 VA

Operating time Phase sequence 0.1 s±0.05 s

Phase loss 0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated voltage)

Reset method Automatic reset

Indicators Power (PWR): Green, Relay output (RY): Yellow

Output relays One SPDT relay (NC operation)

Output relay ratings

Rated load

Resistive load

5 A at 250 VAC

5 A at 30 VDC

Maximum switching capacity: 1,250 VA, 150 W

Minimum load: 5 VDC, 10 mA (reference values)

Mechanical life: 10 million operations min.

Electrical life: 5 A at 250 VAC or 30 VDC:50,000 operations

3 A at 250 VAC/30 VDC:100,000 operations

Ambient operating temperature −20 to 60°C (with no condensation or icing)

Storage temperature −25 to 65°C (with no condensation or icing)

Ambient operating humidity 25% to 85% (with no condensation)

Storage humidity 25% to 85% (with no condensation)

Altitude 2,000 m max.

Terminal screw tightening torque 0.49 to 0.59 N·m

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, UL 94 V-0

Weight Approx. 60 g

Mounting Mounts to DIN Track.

Dimensions 17.5 × 80 × 74 mm (W×D×H)

K8DS-PH

Specifications

Input voltage range 200 to 480 VAC

Input frequency 50/60 Hz (no presumed range)

Overload capacity Continuous 500 V

Phase loss detection level

80%±10% of rated input

Calculation Formula

= 1 − ((Highest phase-to-phase voltage − Lowest phase-to-phase voltage)/Average three-

phase phase-to-phase voltage)

Applicable

standards

Conforming standards EN 60947-5-1

Installation environment (pollution level 2, installation category III)

EMC EN 60947-5-1

Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564),

CSA: C22.2 No.14, CCC: GB14048.5

Insulation resistance

20 MΩ min.

Between external terminals and case

Between input terminals and output terminals

Dielectric strength

2,000 VAC for one minute

Between external terminals and case

Between input terminals and output terminals

Noise immunity 1,500 V power supply terminal common/normal mode

Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time

Vibration resistance Frequency: 10 to 55 Hz, 0.35-mm single amplitude

10 sweeps of 5 min each in X,Y, and Z directions

Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes

Degree of protection Terminals: IP20

Distance between products d [mm]

Ambient temperature [°C]

5 101520253035 5040 45

K8DS

No.3

K8DS

No.2

K8DS

No.1

K8DS

No.4

K8DS

No.5

DIN Track Distance between products: d

Sample: K8DS-PH

Distance between products: 0, 5, and 10 mm min.

Test method

●Relationship of Mounting Distance between K8DS-PH Relays

and Ambient Temperature (Reference Values)

The following diagram shows the relationship between the mounting distances and the

ambient temperature.

If the relay is used with an ambient temperature that exceeds these values, the

temperature of the K8DS may rise and shorten the life of the internal components.

K8DS-PH

Connections

Terminal Diagram

Note: Use the recommended ferrules if you use twisted wires.

Wiring Example

Timing Charts

●Phase Sequence and Phase Loss Operation

Diagram

Note: 1. The K8DS-PH1 output contacts are normally operative.

2. The Relay will not operate if the input voltage drops below

70% of the minimum input value because L2 and L3 are

also used to provide power.

3. Phase loss cannot be detected on the load side because

this detection is based on the voltage.

L1 L2 L3

Control Output

Relay output

250 VAC, 5 A (resistive load)

3-phase,

3-wire

power

supply

30 VDC, 5 A (resistive load)

Relay Output

Input Voltages

Phase-to-phase voltage:

200 to 480 VAC

L2 L3

14 12 11

L1 L2 L3

3-phase

voltage Motor

Power supply

AC/DC

Relay 11-14

Phase Loss Operation Phase Sequence Operation

Input

K8DS-PH

Nomenclature

Front

●Indicators

* This indicator uses the input across L2 and L3 as the internal power

supply. It will not light unless there is an input across L2 and L3.

Note: 1. Use either a solid wire of 2.5 mm2 maximum or a ferrule with

insulating sleeve for the terminal connection.

The length of the exposed current-carrying part inserted into

the terminal must be 8 mm or less to maintain dielectric

strength after connection.

Recommended ferrules

Phoenix Contact

•Al 1,5-8BK (for AWG16)

•Al 1-8RD (for AWG18)

•Al 0,75-8GY (for AWG18)

2. Tightening torque: 0.49 to 0.59 N·m

Operation Methods

Connections

●Input

Connect using L1, L2, and L3.

Make sure the phase sequence is wired correctly. The Unit will not

operate normally if the phase sequence is incorrect.

●Outputs

Terminals 11, 12, and 14 are the output terminals SPDT.

* Use the recommended ferrules if you use twisted wires.

Power indicator

Relay status indicator

Terminal block

(See notes 1 and 2.)

L1 L2 L3

14 12 11

Item Meaning

Power indicator

(PWR: Green) Lit when power is being supplied*.

Relay status indi-

cator

(RY: Yellow)

Lit when relay is operating (normally lit).

For 2.5 mm2 or

smaller solid wires

For ferrules with

an insulation sleeve.

8 mm max. 8 mm max.

Load

Voltage input

Signal output

Relay signal

output

L1 L2 L3

K8DS-PH

Dimensions (Unit: mm)

Phase-sequence Phase-loss Relay

Optional Parts for DIN Track Mounting

17.5 74

K8DS-PH1

*Dimensions in parentheses are for the PFP-50N.

4.5

15 25 25

10 10

1,000 (500)*

25 25

15 (5)*

35±0.3

7.3±0.15

27±0.15

●DIN Tracks

PFP-100N

PFP-50N

K8DS-PH

Checking Operation

Phase Sequence

Switch the wiring, as shown by the dotted lines in the

connection diagram, to reverse the phase sequence and

check that the K8DS operates.

Phase Loss

Create a phase loss for any input phase and check that the

K8DS operates.

Connection Diagram

Can phase loss be detected on the load side?

In principle, phase loss cannot be detected on the load side

because the K8DS-PH measures three-phase voltage to

determine phase loss.

Is it possible to detect phase losses for motor loads while

the motor is operating?

Phase loss can be detected while the motor is operating.

However, the detection conditions depend on the load

conditions that are shown in the following figure. Understand

these characteristics when using this feature.

Normally, three-phase motors will continue to rotate even if

one phase is open. The three-phase voltage will be induced

at the motor terminals. The diagram shows voltage induction

at the motor terminals when phase R has been lost with a

load applied to a three-phase motor. The horizontal axis

shows the motor load as a percentage of the rated load, and

the vertical axis shows voltage as a percentage of the rated

voltage. The solid line in the this graph shows the voltage that

is induced at the motor terminals when a phase loss occurs

while the motor is operating under various loads. The figure

below shows how a phase loss that occurs while the motor is

operating causes an imbalance in the voltage across each

motor terminal. The K8DS-PH1 detects phase loss when the

motor is operating when the voltage is unbalanced.

(Detection occurs when the imbalance is 80% of the

maximum phase). The K8DS-PH1 cannot detect phase loss

with light motor loads because the voltage imbalance is too

small. The detectable range is shown by the diagonal lines.

Characteristic Curve Diagram

Note: For phase loss of phase R. VST, VTR, and VRS indicate the motor

terminal voltage at phase loss.

Questions and Answers

L1 L1

L2 L2

L3 L3

3φ,

200 VAC

100

10 0 20 30 40 50 60 70 80 90

100 110

VST

VTR

VRS

Note: This characteristic curve shows the approximate

values only.

Voltage (as a percentage of rated voltage)

Motor load (as a percentage of rated load)

Detectable

area

K8DS-PH

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

Meaning of Product Safety Symbols

Electrical shock may occasionally cause serious injury.

Confirm that the input voltage is OFF before starting any

wiring work and wire all connections correctly.

Electrical shock may cause minor injury.

Do not touch terminals while electricity is being supplied.

There is a risk of minor electrical shock, fire, or device failure.

Do not allow any pieces of metal, conductors, or cutting chips

that occur during the installation process to enter the product.

Explosions may cause minor injuries. Do not use the product

in locations with inflammable or explosive gases.

There is a risk of minor electrical shock, fire, or device failure.

Do not disassemble, modify, repair, or touch the inside of the

product.

Loose screws may cause fires. Tighten terminal screws to the

specified torque of 0.49 to 0.59 N·m.

Use of excessive torque may damage the terminal screws.

Tighten terminal screws to the specified torque of 0.49 to

0.59 N·m.

Use of the product beyond its life may result in contact welding

or burning. Make sure to consider the actual operating

conditions and use the product within its rated load and

electrical life count. The life of the output relay varies

significantly with the switching capacity and switching

conditions.

WARNING

Indicates a potentially hazardous situation

which, if not avoided, will result in minor or

moderate injury, or may result in serious

injury or death. Additionally there may be

significant property damage.

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.

Precautions for

Correct Use

Supplementary comments on what to do or

avoid doing, to prevent failure to operate,

malfunction, or undesirable effects on

product performance.

Used to warn of the risk of electric shock under

specific conditions.

Used for general prohibitions for which there is no

specific symbol.

Used to indicate prohibition when there is a risk of

minor injury from electrical shock or other source if

the product is disassembled.

Used for general mandatory action precautions for

which there is no specified symbol.

WARNING

CAUTION

K8DS-PH

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.)

•Locations subject to rapid temperature changes

•Locations prone to icing and dew condensation

•Locations subject to excessive vibration or shock

•Locations subject to wind and rain

•Locations subject to static electricity and noise

•Habitats of insects or small animals

2. Use and store the product in a location where the ambient

temperature and humidity are within the specified ranges. If

applicable, provide forced cooling.

3. Mount the product in the correct direction.

4. Do not wire the input and output terminals incorrectly.

5. Make sure the input voltage and loads are within the

specifications and ratings for the product.

6. Make sure the crimp terminals for wiring are of the specified size.

7. Do not connect anything to terminals that are not being used.

8. Use a power supply that will reach the rated voltage within 1

second after the power is turned ON.

9. Keep wiring separate from high voltages and power lines that

draw large currents.

Do not place product wiring in parallel with or in the same path as

high-voltage or high-current lines.

10.Do not install the product near equipment that generates high

frequencies or surges.

11.The product may cause incoming radio wave interference. Do not

use the product near radio wave receivers.

12.Install an external switch or circuit breaker and label it clearly so

that the operator can quickly turn OFF the power supply.

13.Make sure the indicators operate correctly. Depending on the

application environment, the indicators may deteriorate

prematurely and become difficult to see.

14.Do not use the product if it is accidentally dropped. The internal

components may be damaged.

15.Be sure you understand the contents of this catalog and handle

the product according to the instructions provided.

16.Do not install the product in any way that would place a load on it.

17.When discarding the product, properly dispose of it as industrial

waste.

18.The product must be handled only by trained electrician.

19.Prior to operation, check the wiring before you supply power to

the product.

20.Do not install the product immediately next to heat sources.

21.Perform periodic maintenance.

Observe the following operating

methods to prevent failure and

malfunction.

1. Use the input power and other power supplies and converters

with suitable capacities and rated outputs.

2. The distortion in the input waveform must be 30% max. If the

input waveform is distorted beyond this level, it may cause

unnecessary operation.

3. The product cannot be used for thyristor control or on the

secondary side of an inverter. To use the product on the primary

side of an inverter, install a noise filter on the primary side of the

inverter.

4. Phase loss can be detected only from the input contacts to the

power supply side. Phase loss cannot be detected from the input

contacts to the load side.

5. When cleaning the product, do not use thinners or solvents. Use

commercial alcohol.

Mounting and Removing

•The product may be mounted in any direction, but it must be

mounted securely and as level as possible.

•To mount the product to the DIN Track, hook it on the DIN Track at

(A) and then press in on the Unit in direction (B).

•To remove the product, insert a flat-blade screwdriver at (C) and

pull down the hook to release the Unit.

•Leave at least 30 mm of space between the product and other

devices to allow easy installation and removal.

Precautions for Safe Use Precautions for Correct Use

(A)

(B)

30 mm min.

(C)

Hook

MEMO

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.

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for a period of twelve months from the date of sale by Omron (or such other period expressed in writing

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or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at Omron’s election,

to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or replacement thereof) the

non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal to the purchase price

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combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable

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Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof.

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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

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Change in Specifications.

Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice

to change part numbers when published ratings or features are changed, or when significant construction changes are made.

However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be

assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to

confirm actual specifications of purchased Product.

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Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is

assumed for clerical, typographical or proofreading errors or omissions.

0513

Authorized Distributor:

In the interest of product improvement,

specifications are subject to change without notice.

Cat. No. N190-E1-01 0314 (0314)

OMRON Corporation Industrial Automation Company

OMRON ELECTRONICS LLC

One Commerce Drive Schaumburg,

IL 60173-5302 U.S.A.

Tel: (1) 847-843-7900/Fax: (1) 847-843-7787

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Tokyo, JAPAN

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Alexandra Technopark,

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200 Yin Cheng Zhong Road,

PuDong New Area, Shanghai, 200120, China CSM_2_2_0317

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