MODEL: LTWT

LTWT SPECIFICATIONS

ES-3355 Rev.18 Page 1/9

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

Power Transducer Series LT-UNIT

WATT TRANSDUCER

Functions & Features

• Provides a DC output signal and a 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

• Conforms to IEC 60688

Typical Applications

• Centralized monitoring and control of power management

system in a manufacturing facility or building

• SCR – Silicon Controlled Rectifier

143 (5.63)

111

(4.37)

72

(2.83)

mm (inch)

MODEL: LTWT–[1][2][3][4][5]–[6][7]

ORDERING INFORMATION

• Code number: LTWT–[1][2][3][4][5]–[6][7]

Specify a code from below for each of [1] through [7].

(e.g. LTWT-115A2-R/T/Q)

• Special output range (For codes Z & 0)

• Specify the specification for option code /Q

(e.g. /C01)

• Use Ordering Information Sheet (No. ESU-3355).

How to determine Pulse Unit

[Example]

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

calibration range 750 W

10 [kWh/pulse] ÷ ((3300÷110) × (250÷5))

= 6.666 [Wh/pulse]

Check that the required pulse unit is within the available

frequency range, 0.006 – 3.12 Hz.

Input Range [W] ÷ (Calculated Pulse × 3600 [s])

= 750 ÷ (6.666 × 3600)

= 0.03125 [Hz]

[1] CONFIGURATION

1: 3-phase / 3-wire

2: Single-phase / 2-wire

3: Single-phase / 3-wire

4: 3-phase / 4-wire

[2] VT INPUT (unbalanced load)

For 3-phase / 4-wire, phase voltages (e.g. 110 V / √3 ) are used.

1: 100, 110, 115, 120 V AC

(Not selectable for single-phase / 3-wire system.)

2: 190, 200, 210, 220, 230, 240 V AC

(Not selectable for single-phase / 3-wire system.)

4: 380, 400, 415, 430, 440, 480 V AC

(Not selectable for single-phase / 3-wire system.)

A: 100 V / 200 V AC

(single-phase / 3-wire only)

[3] CT INPUT (unbalanced load)

Current

1: 1 A AC

2: 2 A AC

5: 5 A AC

[4] DC OUTPUT

Current

A: 4 – 20 mA DC (Load resistance 500 Ω max.)

D: 0 – 20 mA DC(Load resistance 500 Ω max.)

F: 0 – 10 mA DC (Load resistance 1000 Ω max.)

G: 0 – 1 mA DC (Load resistance 10 kΩ max.)

J: 0 – 5 mA DC (Load resistance 2000 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.)

3W: -1 – +1 V DC (Load resistance 1000 Ω min.)