OMRON KM-N2-FLK specification

last update: October 1, 2018

Ratings (Power Monitor)

Model		KM-N2-FLK
Applicable phase wiring methods		Single-phase two-wire, single-phase three-wire, three-phase three-wire, and three-phase four-wire
Number of measured circuits		Single-phase two-wire: 4 circuits max., Single-phase three-wire or three- phase three-wire: 2 circuits max., Three-phase four-wire: 1 circuit
Power consumption		7 VA max.
Input	Rated input voltages (power supply voltages)	Single-phase, 2-wire:100 to 277 VAC Single-phase, 3-wire:100 to 240 VAC (L-N) or 200 to 480 VAC (L-L) Three-phase, 3-wire: 173 to 480 VAC (L-L) Three-phase, 4-wire: 100 to 277 VAC (L-N) or 173 to 480 VAC (L-L)
	Allowable supply voltage range	85% to 115% of rated power supply voltage
	Connectable CTs	General-purpose CT with a rated secondary current of 1 A or 5 A *
	Maximum CT secondary current	6 A
	Rated input frequency	50/60 Hz
Ambient operating temperature		-25 to 55°C (with no condensation or icing)
Ambient operating humidity		25% to 85%
Storage temperature		-25 to 85°C (with no condensation or icing)
Storage humidity		25% to 85%
Operating altitude		2,000 m max.
Installation environment		Overvoltage category II, measurement category II, pollution degree 2
Electromagnetic environment		Industrial electromagnetic environment (EN/IEC 61326-1 Table 2)
Compliant standards		EN 61010-2-030, EN 61326-1, and UL 61010-1

* The KM-series CTs (the KM20-CTF or KM-NCT Series) cannot be used. Use general-purpose CTs with a secondary-side output of 1 A or 5 A.

Split Type Current Transformer (CT) (CE marking compliant KM-N2/N3 dedicated products *)

Item	KM-NCT-E100A	KM-NCT-E250A	KM-NCT-E500A
Rated primary current: In	100 A	250 A	500 A
Rated secondary current: Is	1 A
Rated frequency	50/60 Hz
Cable Length	Please refer to Writing to KM-NCT-E[][][]A
Rated load	1 VA
Insulation resistance	100 MΩ min. (at 500 VDC mega) between core and all output terminals
Dielectric strength voltage	2300 VAC, 1 minute between core and all output terminals.
Weight	Approx. 170 g	Approx. 175 g	Approx. 290 g
Maximum wire diameter	24 dia.	24 dia.	36 dia.
Operating temperature and humidity range	-20 to 55 °C, relative humidity: 85% max. with no condensation
Storage temperature and humidity range	-30 to 90 °C, relative humidity: 85% max. with no condensation
Applicable standards *	EN61010-1, EN61010-2-030, EN61326-1
Installation environment	Overvoltage category and measurement category:Ⅱ, Pollution level: 2

* The KM-NCT-E conforms to the standards shown above ONLY when it is used with a power monitor KM-N2-FLK or KM-N3-FLK to which it is attached. Use of the KM-NCT-E without a power monitor does not conform to these standards.

Wiring to KM-NCT-E[][][]A

• For wiring of the output terminal of CT, use AWG18-14 electric wire (with a cross-section of 0.75-2.0 mm²) and Y-shape terminal compatible with the M3 screw.
• The recommended torque for screwing the M3 screws onto the output terminal is 0.3 N·m. Make sure the Y terminal is pushed all the way in and tightened firmly. After fixing the wiring, confirm that the wire is fixed securely.
• The guideline of the maximum wiring length between KM-N2-FLK or KM-N3-FLK and KM-NCT-E is as follows.
The longer the wire length, the larger the measurement error using the KM-NCT-E becomes.
• The limit of the wiring length can also be calculated by the following formula. Calculate the wiring length limit according to the conductor resistivity of the wiring and keep the wiring length below the limit.
• The limits of the wiring length shown below are for reference only. They do not guarantee proper use.

Wiring diameter Guideline	Guideline for wiring length limit
0.75 mm2 (AWG18 equivalent)	15 m
2.0 mm2 (AWG14 equivalent)	43 m

Wiring extension limit value (one-way) (m)= 0.475/conductor resistivity (Ω/m)

Note: Select a CT cable that does not exceed the rated load of 1 VA.

Performance (Power Monitor)

Model		KM-N2-FLK
Measured items		Total power consumption (active, regenerative, and reactive), power (active and reactive), current, voltage, power factor, and frequency
Meas- urement specifi- cations	Active power	0.5% (IEC 62053-22 class 0.5S) *
	Reactive power	2% (IEC 62053-23 class 2) *
	Sampling cycle	80 ms for 50 Hz and 66.7 ms for 60 Hz
Insulation resistance		(1) Between all electrical circuits and the case: 20 MΩ min. (at 500 VDC) (2) Between all power supply and voltage inputs and all communications and pulse output terminals: 20 MΩ max. (at 500 VDC)
Dielectric strength		(1) Between all electrical circuits and the case: 1,400 VAC for 1 min (2) Between all voltage and current inputs and all communications and pulse output terminals: 1,400 VAC for 1 min
Vibration resistance		Single amplitude: 0.1 mm, Acceleration: 15 m/s2, Frequency: 10 to 150 Hz, 10 sweeps for 8 min each along three axes
Shock resistance		150 m/s2, 3 times each in 6 directions (up/down, left/right, forward/ backward)
Indications and operation method		LED/LCD indications and operation buttons
Weight		Approx. 350 g (Power Monitor only)
Degree of protection		IP20
Pulse output	Number of outputs	Number of outputs: 4 (photoMOS relay outputs) Used for the total power consumption pulse output.
	Output capacity	50 mA at 40 VDC ON residual voltage: 1.5 V max. (for output current of 50 mA) OFF leakage current: 0.1 mA max.
	Output unit	Output unit: 1, 10, 100, 1k, 5k, 10k, 50k, or 100k (wh) Pulse ON time: 500 ms (Cannot be changed.)
Commu- nications interface	Communications method	RS-485 (2-wire half-duplex with start-stop synchronization)
	Communications protocol	Modbus (RTU): Binary. CompoWay/F: ASCII
	Baud rate	1.2, 2.4, 4.8, 9.6, 19.2, or 38.4 kbps
	Data length	Data length: 7 or 8 bits Stop bits: 1 or 2 bits Vertical parity: Even, odd, or none
	Maximum transmission distance	1,200 m
	Maximum number of connected Power Monitors	Modbus: 99, CompoWay/F: 31 If you measure more than one circuit with one Power Monitor, the number of circuits is treated as the number of connected Power Monitors.
Dimensions (H×W×D)		90 × 90 × 65 mm (excluding protrusions)
Installation method		DIN Rail mounting
Accessories		Instruction Manual and Compliance Sheet

* The error of the CT or VT is not included. IEC 62053 is an international standard for power metering.

last update: October 1, 2018

OMRON KM-N2-FLK catalog

• Catalog
• Manual
• CAD

English

Global Edition

For ordering in Singapore, please note some product models not sold in Singapore may be included in the following catalog(s) for our global customers.

*It is recommended to select “Save” from the right-click due to large size of catalog PDF data.

Catalog Name	Catalog Number [size]	Last Update
KM-N2 / KM-N3 Catalog	N213-E1-05 [7696KB]	Feb 01, 201920190201	KM-N2 / KM-N3 Catalog
Innovation in Control Panel Building	Y218-E1-03 [13592KB]	Oct 02, 201720171002	Innovation in Control Panel Building

OMRON KM-N2-FLK lineup

last update: October 1, 2018

Power Monitor

Model	Applicable phase wiring methods	Power supply voltage	Dimensions	Communications
KM-N2-FLK	Single-phase, 2-wire: 100 to 277 VAC Single-phase, 3-wire: 100 to 240 VAC (L-N) or 200 to 480 VAC (L-L) Three-phase, 3-wire: 173 to 480 VAC (L-L) Three-phase, 4-wire: 100 to 277 VAC (L-N) or 173 to 480 VAC (L-L)	Same as measured circuits: 100 to 277 VAC (L-N) 173 to 480 VAC (L-L)	90 × 90 × 65 mm (H×W×D)	RS-485 communications, pulse output

To use a commercially available current transformer, use a CT with a secondary current rating of 1 A or 5 A, and a rated load of at least 1.0 VA.

Split Type Current Transformer (CT) (CE marking compliant KM-N2/N3 dedicated products *)

Model	Rated primary current	Rated secondary current
KM-NCT-E100A	100 A	1 A
KM-NCT-E250A	250 A
KM-NCT-E500A	500 A

* The KM-NCT-E conforms to the standards shown above ONLY when it is used with a power monitor KM-N2-FLK or KM-N3-FLK to which it is attached. Use of the KM-NCT-E without a power monitor does not conform to these standards.
Note: Select a CT cable that does not exceed the rated load of 1 VA.

last update: October 1, 2018

OMRON KM-N2-FLK dimension

last update: October 1, 2018

(Unit: mm)

Power Monitor

KM-N2-FLK

KM-NCT-E100A
KM-NCT-E250A
KM-NCT-E500A
(CE marking compliant KM-N2/N3 dedicated products *)

* The KM-NCT-E conforms to the standards shown above ONLY when it is used with a power monitor KM-N2-FLK or KM-N3-FLK to which it is attached. Use of the KM-NCT-E without a power monitor does not conform to these standards.

last update: October 1, 2018

• NO. KM-N2-FLK
• TYPE:Electric Power Monitoring Equipment Smart Power Monitor Copyright Statement
• DATE:2021-06-13
• Associated products:
  KM-N3-FLK Power Monitor/Features KM1 Multi-circuit Smart Power Monitor/Features