MODEL: LTWTN
= 6.666 × 10–3 [kWh/pulse]
= 6.666 [Wh/pulse]
Power Transducer Series LT-UNIT
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)
WATT TRANSDUCER
(self-powered)
Functions & Features
• Provides a DC output signal and a pulse totalizer signal in
proportion to AC active power
= 0.03125 [Hz]
• Convenient pulse unit output (Wh×10
n)
[1] CONFIGURATION
1: 3-phase / 3-wire
• Measuring bidirectional power flow
• DC output containing little ripple is ideal for computer
input
2: Single-phase / 2-wire
3: Single-phase / 3-wire
4: 3-phase / 4-wire
• “Time division multiplication” method accepts distorted
waveforms
• Isolation up to 2000 V AC
• High-density mounting
[2] VT INPUT (unbalanced load)
For 3-phase / 4-wire, phase voltages (e.g. 110 V / √3 ) are used.
1: 110 V AC
• Conforms to IEC 60688
• No auxiliary power supply required
(Not selectable for single-phase/3-wire system.)
2: 220 V AC
Typical Applications
• Centralized monitoring and control of power management
system in a manufacturing facility or building
• SCR – Silicon Controlled Rectifier
(Not selectable for single-phase/3-wire system.)
4: 220 V / 380 V AC (3-phase/4-wire only)
A: 100 V / 200 V AC
(single-phase / 3-wire only)
72
(2.83)
[3] CT INPUT (unbalanced load)
Current
1: 1 A AC
2: 2 A AC
5: 5 A AC
111
(4.37)
[4] DC OUTPUT
143 (5.63)
Current
mm (inch)
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
MODEL: LTWTN–[1][2][3][4][5][6]
ORDERING INFORMATION
• Code number: LTWTN–[1][2][3][4][5][6]
Specify a code from below for each of [1] through [6].
(e.g. LTWTN-115A2/T/Q)
• Special output range (For codes Z & 0)
• Specify the specification for option code /Q
(e.g. /C01)
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.)
• 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))
LTWTN SPECIFICATIONS
ES-3356 Rev.13 Page 1/5
https://www.m-system.co.jp/