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KM-N3

  • EPLAN parts data
  • KM-N3 Power Monitor Datasheet
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Features

Global power monitor for On-panel installation

  • Solve design, installation, and operation topics.
  • You can measure up to four circuits with one power monitor.
  • Use general-purpose CTs and handle a variety of worksites.
  • Large, easy-to-read white and green LCD for improved visibility.
  • IEC Class 0.5S high-precision measurements (Power monitor only).
Specifications & ordering info

Ordering Information

Power monitor

Applicable phase wiring methods

Power supply voltage

Dimensions (W×H×D)

Communications

Order Code

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)

100 to 240 VAC
Separate from measurement voltage.

96 × 96 × 64 mm
(excluding protrusions)

RS-485 communications,
pulse output

KM-N3-FLK

Note: 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.

Optional products

Item

Remark

Order code

Terminal covers

To be ordered separately. The cover improves protection of terminals

E53-COV24 (3pcs)

Waterproof packing

This waterproof packing is provided with the KM-N3.

Y92S-P10

Mounting adapter

This mounting adapter is provided with the KM-N3.

Y92F-51 (2pcs)

Connectable OMRON split-type Current Transformers (CTs)

Rated primary current

Rated secondary current

Order code

100 A

1 A

KM20-CTN100

250 A

KM20-CTN250

500 A

KM20-CTN500

Note: The CT cables connected to the CT have the following recommended characteristics:
- cross section 0.75 mm² = AWG18
- 2C (number of internal wires is two)
- 1 m long maximum.
The CT cables are not provided by Omron

Specifications

Ratings (Power monitor)

 

 

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 supply voltage (operating frequency)

100 to 240 VAC (50/60 Hz)

Power supply allowable voltage range

85% to 110% of rated power supply voltage

Power consumption

7 VA max.

Input

Rated input 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 A1

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 (pending)

Ratings (Connectable OMRON Split-type Current Transformers (CTs))

Item

KM20-CTN100

KM20-CTN250

KM20-CTN500

Rated primary current

100 A

250 A

500 A

Rated secondary current

1 A

1 A

1 A

Rated frequency

50/60 Hz

Insulation resistance

100 MΩ min. (at 500 VDC) (Between through hole and output lead)

Dielectric strength

2,000V AC 1min. (Between through hole and output lead)

Cable length

1 m

Through-hole

24 diameter

36 diameter

Weight

Approx. 210 g

Approx. 500 g

Operating temperature and humidity ranges

−20 to 55 °C, 85% max. relative humidity (with no condensation)

Storage temperature and humidity ranges

−30 to 90 °C, 85% max. relative humidity (with no condensation)

Performance (Power monitor)

Item

KM-N3-FLK

Measured items

Total power consumption (active, regenerative, and reactive), power (active and reactive), current, voltage, power factor, and frequency

Measurement specifications

Active power

0.5% (IEC 62053-22 class 0.5S 2

Reactive power

2% (IEC 62053-23 class 2) 1

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: 2,200 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

LCD indications and operation buttons

Weight

Approx. 350 g (Power Monitor only)

Degree of protection

Front: IP65, Rear case: IP20, Terminal: IP00

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.)

Communications 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)

96 × 96 × 64 mm (excluding protrusions)

Installation method

On-panel installation

Accessories

Instruction Manual and Compliance Sheet, Mounting adapter and waterproof packing


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

Ordering Information

Power Monitor

Applicable circuits and rated voltage

Power supply voltage

Dimensions (W×H×D)

Communications

Order Code

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)

100 to 240 VAC
Separate from measurement voltage.

96 × 96 × 64 mm
(excluding protrusions)

RS-485 communications,
pulse output

KM-N3-FLK

Note: 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.

Specifications

Ratings

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 supply voltage (operating frequency)

100 to 240 VAC (50/60 Hz)

Power supply allowable voltage range

85% to 110% of rated power supply voltage

Power consumption

7 VA max.

Input

Rated input 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 A1

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

Performance

Measured items

Energy consumption (active, regenerative, and reactive), power (active and reactive), current, voltage, power factor, and frequency

Measurement specifications

Active power

0.5% (IEC 62053-22 class 0.5S2

Reactive power

2% (IEC 62053-23 class 2)1

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: 2,200 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

LCD indications and operation buttons

Weight

Approx. 350 g (Power Monitor only)

Degree of protection

Front: IP65, Rear case: IP20, Terminal: IP00

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.)

Communications 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 (W×H×D)

96 × 96 × 64 mm (excluding protrusions)

Installation method

On-panel installation

Accessories

Instruction Manual and Compliance Sheet, Mounting adapter and waterproof packing


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

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

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

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

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