MODEL: L53U

L53U SPECIFICATIONS

ES-1958 Rev.13 Page 2/9

https://www.m-system.co.jp/

GENERAL SPECIFICATIONS

Connection

Voltage input: Connector type terminal block

length 7 - 8 mm)

Current input: Screw terminal block

length 13 - 15 mm)

Discrete input, discrete output, analog output, Modbus,

auxiliary power supply: Connector type terminal block

length 7 - 8 mm)

Configuration: Single phase/2-wire and 3-wire, 3-phase/3-

wire balanced/unbalanced load, 3-phase/4-wire

balanced/unbalanced load

Housing material: Flame-resistant resin (gray)

Isolation: Voltage input to current input to discrete input to

discrete output to Modbus or configurator jack or analog

output to auxiliary power

■ Measured variables

Voltage: 1 – N, 2 – N, 3 – N, 1 – 2, 2 – 3, 3 – 1

Current: 1, 2, 3, N

Active / reactive / apparent power: 1, 2, 3, Σ

Power factor: 1, 2, 3, Σ

Frequency

Voltage phase angle: 1 – 2, 2 – 3, 3 – 1

Active energy: Incoming / outgoing / high tariff (peak) / low

tariff (off-peak)

Reactive energy: Incoming / outgoing / lag / lead / high tariff

(peak) / low tariff (off-peak)

Apparent energy

Active / reactive / apparent average power (demand)

Average current: 1, 2, 3,N

Harmonic contents: Σ, 2nd to 31st

Count time: High tariff / low tariff

Max. and min. values

Demand history: 1 to 4

INPUT SPECIFICATIONS

Frequency: 50 / 60 Hz (45 – 65 Hz)

• Voltage Input

Rated voltage

Line-to-line (delta voltage): 480 V

Line-neutral (phase voltage): 277 V (single phase / 2-wire

and 3-wire)

Overload capacity: 200 % of rating for 10 sec., 120 %

continuous

Selectable primary voltage range: 50 – 400 000 V

• Current Input

Rated current: 1 A or 5 A

Overload capacity: 4000 % of rating for 1 sec., 2000 % for

4 sec., 120 % continuous

Selectable primary current range: 1 – 20 000 A

Selectable primary power range: ≤ 2 G VA

Operational range

Voltage, current, apparent power: ≤ 120 % of the rating

Active / reactive power: -120 to +120 % of the rating

Frequency: 45 – 65 Hz

Power factor: -1 to +1

■ Discrete Input: 24 V DC or 110 V DC

(input resistance 6 kΩ)

Detecting voltage: External 24 V DC ±10 % or 110 V DC

±10 %

ON current: ≥ 1 mA (≤ 24 kΩ @ 24 V, ≤ 110 kΩ @110 V)

OFF current: ≤ 0.1 mA (≥ 240 kΩ @ 24 V, ≥ 1.1 MΩ @ 110

V)

Detecting time: 10 – 1000 msec.

The status can be monitored on the Modbus; usable to reset

energy count or to update average (demand) value.

OUTPUT SPECIFICATIONS

■ Modbus

Communication: Half-duplex, asynchronous, no procedure

Interface: Conforms to TIA/EIA-485-A

Max. transmission distance: 500 meters

Baud rate: 1.2 – 38.4 kbps

Max. number of nodes: 31 (except the master)

Protocol: Modbus RTU

Node address: 1 – 247 (factory default setting: 1)

Parity: none, even or odd (factory default setting: odd)

Stop bit: 1 or 2 (factory default setting: 1)

Media: Shielded twisted-pair cable (CPEV-S 0.9 dia.)

■ DC Current: 4 – 20 mA DC

Load resistance: ≤ 270 Ω

Measurands converted into analog output: Voltage, Current,

Active / reactive / apparent power, Power factor, Frequency,

Harmonic contents

■ DC Voltage: 1 – 5 V DC

Load resistance: ≥ 5000 Ω

Measurands converted into analog output: Voltage, Current,

Active / reactive / apparent power, Power factor, Frequency,

Harmonic contents

■ Open Collector

Programmable for either alarm or energy count.

Max. rated load: 130 V DC @50 mA

Continuous rated load: 130 V DC @30 mA

Saturation voltage: 1.5 V DC

Measurands applicable to alarm: Voltage, current, average

current (demand), neutral current, frequency, power,

average power (demand)

(ON delay, deadband and other parameters are selectable)

Measurands applicable to count: Energy;