MODEL: LWTN

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

LWTN SPECIFICATIONS

ES-1976 Rev.2 Page 1/5

Power Transducer Series L-UNIT

WATT TRANSDUCER

(self-powered, with pulse output)

Functions & Features

• Providing a DC output signal and pulse totalizer signal in

proportion to AC active power

• Measuring bidirectional power flow

• DC output containing little ripple is ideal for computer

input

• "Time division multiplication" method accepts distorted

waveforms

• Isolation up to 2000 V AC

• High-density mounting

Typical Applications

• Centralized monitoring and control of power management

system in a manufacturing facility or building

• SCR – Silicon Controlled Rectifier

75

(2.95)

112

(4.41)

75

(2.95)

mm (inch)

MODEL: LWTN–[1][2][3][4][5]

ORDERING INFORMATION

• Code number: LWTN–[1][2][3][4][5]

Specify a code from below for each [1] through [5].

(e.g. LWTN-11A2/Q)

• Specify the specification for option code /Q

(e.g. /C01/S01)

• Calibration range (e.g. -750 – +750 W)

• VT ratio, CT ratio (e.g. VT 3300/110 V, CT 250/5 A)

• Special DC output range (For codes Z & 0)

• Pulse output (e.g. 6.666 Wh/pulse)

How To Determine Pulse Unit

[example]

3-phase / 3-wire, VT 3300/110 V, CT 250/5 A,

calibration range 750 W

•From Pulse Unit 10 [kWh/pulse]

10 [kWh/pulse] / (3300/110) × (250/5)

= 6.666 [Wh/pulse]

•From Pulse Rate 150 [pulses/kWh]

1 / 150 [pulses/kWh]

= 6.666 [Wh/pulse]

•From Frequency 0.03125 Hz (at 100 %)

750 [W] / 0.03125 [H] × 3600 [s]

= 6.666 [Wh/pulse]

[1] CONFIGURATION

1: 3-phase / 3-wire

2: Single-phase / 2-wire

3: Single-phase / 3-wire

4: 3-phase / 4-wire

[2] INPUT (unbalanced load)

1: 110 V / 5 A AC

2: 110 V / 1 A AC

3: 220 V / 1 A AC

4: 220 V / 5 A AC

5: 220 V / 380 V / 1 A AC (3-phase / 4-wire)

6: 220 V / 380 V / 5 A AC (3-phase / 4-wire)

7: 110 V / 190 V / 1 A AC (3-phase / 4-wire)

8: 110 V / 190 V / 5 A AC (3-phase / 4-wire)

A: 100 V / 200 V / 1 A AC (single-phase / 3- wire)

B: 100 V / 200 V / 5 A AC (single-phase / 3- wire)

[3] DC OUTPUT

Current

A: 4 – 20 mA DC (Load resistance 600 Ω max.)

B: 2 – 10 mA DC (Load resistance 1200 Ω max.)

C: 1 – 5 mA DC (Load resistance 2400 Ω max.)

D: 0 – 20 mA DC (Load resistance 600 Ω max.)

E: 0 – 16 mA DC (Load resistance 750 Ω max.)

F: 0 – 10 mA DC (Load resistance 1200 Ω max.)

G: 0 – 1 mA DC (Load resistance 12 kΩ max.)

J: 0 – 5 mA DC (Load resistance 2400 Ω max.)

FW: -10 – +10 mA DC (Load resistance 1000 Ω max.)

GW: -1 – +1 mA DC (Load resistance 10 kΩ max.)

JW: -5 – +5 mA DC (Load resistance 2000 Ω max.)

Z: Specify current (See OUTPUT SPECIFICATIONS)

Voltage

1: 0 – 10 mV DC (Load resistance 10 kΩ min.)

2: 0 – 100 mV DC (Load resistance 100 kΩ min.)

3: 0 – 1 V DC (Load resistance 1000 Ω min.)

4: 0 – 10 V DC (Load resistance 10 kΩ min.)

5: 0 – 5 V DC (Load resistance 5000 Ω min.)

6: 1 – 5 V DC (Load resistance 5000 Ω min.)

1W: -10 – +10 mV DC (Load resistance 10 kΩ min.)

2W: -100 – +100 mV DC (Load resistance 100 kΩ min.)