Datasheet

ManualsBrandsOmron Industrial Automation ManualsMonitoring RelaysPhase monitoring relay 480V 2CO

New Product

Three-phase Voltage and Phase-sequence Phase-loss Relay

K8AK-PM

Ideal for Monitoring 3-phase Power

Supplies for Industrial Facilities and

Equipment.

• Greater resistance to inverter noise.

• Monitor overvoltages, undervoltages, phase sequence,

and phase loss for three-phase 3-wire or 4-wire power

supplies with just one Unit.

Switch setting for 3-phase 3-wire or 3-phase 4-wire power

supply.

• Two SPDT output relays, 5 A at 250 VAC (resistive load).

Output overvoltages and undervoltages using separate

relays.

• World-wide power specifications supported by one Unit

(switchable).

• Output status can be monitored using LED indicator.

Ordering Information

List of Models

Note: Three-phase 3-wire or 4-wire and the input range are switched using a DIP switch.

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

●Single K8AK Monitors 3-phase Power Supply with 3 or 4 Wires

Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings.

A Single K8AK Can Monitor a 3-phase Power Supply Anywhere in the World

Reduces Maintenance Parts Inventory

Refer to Safety Precautions on page 10.

Refer to page 8 to 9 for commonly asked questions.

For the most recent information on models that have been certified for

safety standards, refer to your OMRON website.

Rated input* Model

3-phase 3-wire mode 200, 220, 230, 240 VAC K8AK-PM1

3-phase 4-wire mode 115, 127, 133, 138 VAC

3-phase 3-wire mode 380, 400, 415, 480 VAC K8AK-PM2

3-phase 4-wire mode 220, 230, 240, 277 VAC

SW3 ON OFF ON OFF

SW4 ON ON OFF OFF

K8AK-PM1

SW2

ON P-N 138 V 133 V 127 V 115 V

OFF P-P 240V 230 V 220 V 200 V

K8AK-PM2

SW2

ON P-N 277 V 240 V 230 V 220 V

OFF P-P 480 V 415 V 400 V 380 V

Phase to phase voltage (3 wires)

Phase to neutral voltage (4 wires)

L1 L2 L3 L1 L2 L3 N

400VAC

230VAC

Summary of content (16 pages)

PAGE 1
New Product Three-phase Voltage and Phase-sequence Phase-loss Relay K8AK-PM Ideal for Monitoring 3-phase Power Supplies for Industrial Facilities and Equipment. • Greater resistance to inverter noise. • Monitor overvoltages, undervoltages, phase sequence, and phase loss for three-phase 3-wire or 4-wire power supplies with just one Unit. Switch setting for 3-phase 3-wire or 3-phase 4-wire power supply. • Two SPDT output relays, 5 A at 250 VAC (resistive load).
PAGE 2
K8AK-PM Ratings and Specifications Ratings Rated input voltage K8AK-PM1 K8AK-PM2 Input load Operating value setting range (OVER, UNDER) Operating value Reset value Reset method Operating time setting range (T) Overvoltage/undervoltage Phase sequence Phase loss Power ON lock time (LOCK) Indicators Output relays Output relay ratings Ambient operating temperature Storage temperature Ambient operating humidity Storage humidity Altitude Terminal screw tightening torque Terminal wiring method Case color Ca
PAGE 3
K8AK-PM Specifications Input frequency 50/60 Hz Overload capacity Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC). Repeat accuracy Applicable standards Operating value ±0.
PAGE 4
K8AK-PM Connections Terminal Diagram Control Output Relay Output 250 VAC, 5 A (resistive load) 30 VDC, 5 A (resistive load) 21 24 22 L1 L2 L3 Input Voltages Relay Output L1 Undervoltage, phase sequence or phase loss 21 24 22 L2 L3 3-phase, 3-wire power supply _ L2 L3 N _ _ 3-phase, 4-wire power supply or N L1 _ Relay Output Overvoltage 11 12 Monitoring 3-phase, 3-wire Power Supply N _ _ 11 12 14 Monitoring 3-phase, 4-wire Power Supply 14 Note: 1.
PAGE 5
K8AK-PM Nomenclature ●Indicators Front Item Power indicator (PWR: Green) Relay status indicator (RY: Yellow) Alarm Overvoltage: indicator Red Terminal block (See notes 1 and 2.) Overvoltage knob (OVER) Power indicator Relay status indicator Alarm indicator Undervoltage knob (UNDER) Operating time knob (T) Meaning Lit when power is being supplied* Lit when relay is operating (normally lit). Lit when there is an overvoltage.
PAGE 6
K8AK-PM Operation Methods Connections ●Input N L1 L2 L3 Connect to L1, L2, and L3 (for three-phase three-wire mode) or L1, L2, L3, and N (for three-phase four-wire mode), depending on the mode selected using pin 2 on the DIP switch. The Unit will not operate correctly if the DIP switch setting and the wiring do not agree. Make sure the phase sequence is wired correctly. The Unit will not operate normally if the phase sequence is incorrect.
PAGE 7
K8AK-PM Setting Method l ●Overvoltage The overvoltage knob (OVER) is used to set the overvoltage threshold. The overvoltage can be set to between −30% and 25% of the rated input voltage. 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 voltage. The rated input depends on the model and DIP switch setting.
PAGE 8
K8AK-PM Questions and Answers Q Q Checking Operation How to Measure the Operating Time Overvoltages Gradually increase the input from 80% of the set value. The input value 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 output that will start after the operating time has passed.
PAGE 9
K8AK-PM Questions and Answers Q Q Load-side Phase Loss In principle, phase loss cannot be detected on the load side because the K8AK-PM measures three-phase voltage to determine phase loss. Q Overvoltage Detection When Only One Phase Exceeds the Overvoltage Set Value The K8AK monitors each of the three-phase voltages. This means an overvoltage is detected even if only one phase exceeds the set value. The same applies to undervoltages.
PAGE 10
K8AK-PM 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 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.
PAGE 11
K8AK-PM 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 12
K8AK-PM Adjusting the Setting Knobs • Use a screwdriver to adjust the setting knobs. The knobs have a stopper that prevents them from turning beyond the full right or left position. Do not force a knob beyond these points.
PAGE 13
MEMO 13
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: 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.