MODEL: LTWT

LTWT SPECIFICATIONS

ES-3355 Rev.18 Page 3/9

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

• Single-phase / 2-wire

INPUT

BURDEN (VA)

STD.RANGE

USABLE

RANGE

VT

CT

1/1

1/2

1/5

±100 W

±200 W

±500 W

0.2

0.1

0.2

0.5

±50 – ±120 W

±100 – ±240 W

±250 – ±600 W

VT/CT CODE

2/1

2/2

2/5

±200 W

±400 W

±1000 W

0.4

0.1

0.2

0.5

±200 – ±480 W

±500 – ±1200 W

4/1

4/2

4/5

±400 W

±800 W

±2000 W

0.6

0.1

0.2

0.5

±400 – ±960 W

±1000 – ±2400 W

±100 – ±240 W

±200 – ±480 W

• Single-phase / 3-wire

INPUT

BURDEN (VA)

STD.RANGE

USABLE

RANGE

VT

CT

A/1

A/2

A/5

±200 W

±400 W

±1000 W

0.2

/phase

0.1/ph

0.2/ph

0.5/ph

±100 – ±240 W

VT/CT CODE

±200 – ±480 W

±500 – ±1200 W

• 3-phase / 3-wire

INPUT

BURDEN (VA)

STD.RANGE

USABLE

RANGE

VT

CT

1/1

1/2

1/5

±200 W

±400 W

±1000 W

0.2

/phase

0.1/ph

0.2/ph

0.5/ph

±100 – ±240 W

±200 – ±480 W

±500 – ±1200 W

VT/CT CODE

2/1

2/2

2/5

±400 W

±800 W

±2000 W

0.4

/phase

0.1/ph

0.2/ph

0.5/ph

±400 – ±960 W

±1000 – ±2400 W

4/1

4/2

4/5

±800 W

±1600 W

±4000 W

0.6

/phase

0.1/ph

0.2/ph

0.5/ph

±800 – ±1920 W

±2000 – ±4800 W

±200 – ±480 W

±400 – ±960 W

• 3-phase / 4-wire

INPUT

BURDEN (VA)

STD.RANGE

USABLE

RANGE

VT

CT

1/1

1/2

1/5

±200 W

±400 W

±1000 W

0.1

/phase

0.1/ph

0.2/ph

0.5/ph

±100 – ±240 W

±200 – ±480 W

±500 – ±1200 W

VT/CT CODE

2/1

2/2

2/5

±400 W

±800 W

±2000 W

0.3

/phase

0.1/ph

0.2/ph

0.5/ph

±400 – ±960 W

±1000 – ±2400 W

4/1

4/2

4/5

±800 W

±1600 W

±4000 W

0.4

/phase

0.1/ph

0.2/ph

0.5/ph

±800 – ±1920 W

±2000 – ±4800 W

±200 – ±480 W

±400 – ±960 W

OUTPUT SPECIFICATIONS

■DC Output

• DC Current: -10 – +20 mA DC

Span: Min. 1 mA, max. 20 mA

Offset: Max. 1.5 times span

Load resistance: Output drive 10 V max.

• DC Voltage: -10 – +12 V DC

Minimum span: 5 mV

Offset: Max. 1.5 times span

Load resistance: Output drive 1 mA max. at ≥ 0.5 V

■ Pulse output: Open collector

0 Hz at 0 W (cutout at approx. 0.5 – 1.0 %)

Rating: 35 V DC @ 100 mA

ON voltage: ≤ 1 V at 100 mA

ON duration: Max. 0.5 sec., min. 50 msec. (approx.)

Frequency range: 0 – 2.777 Hz (0 – 100 %) standard; 0 –

0.006 Hz through 3.12 Hz is possible.

• 2.777 Hz at 100 % Input

[Example] 1000 W calibration range

2.777 [Hz] × 3600 [s] ÷ 1 [kW] = 10000 [pulses/kWh]

• Specified Pulse Unit: Refers to how much electrical energy

(kWh) consumption at the primary of the VT and CT

corresponds to the single output pulse per hour from the

transducer.

500

1000 W

0

12

OUT

20 mA

500

1000 W

0

5

OUT

10 V

4

0

+1000 W

-1000 W

12

OUT

20 mA

0

+1000 W

-1000 W

0

OUT

+10 V

4

-10 V

s OPERATION DIAGRAM (example)

INSTALLATION

Power Consumption

•AC: Approx. 2 VA

•DC: Approx. 2 W (18 mA at 110 V)

Operating temperature: -10 to +55°C (14 to 131°F)

Operating humidity: 30 to 85 %RH (non-condensing)

Mounting: Surface or DIN rail

Weight: 450 g (0.99 lb)

PERFORMANCE in percentage of span

Accuracy: ±0.5 % (at 23°C ±10°C or 73.4°F ±18°F,

45 – 65 Hz)

Magnetic field (ext. origin) effect: ± 0.5 % (400 A/m)

Response time: ≤ 2 sec. (0 – 100 % ±1 %)

Ripple: 0.5 %p-p max.(The output ripple may increase when

there is great difference between the frequencies of input

signal and power supply)

Line voltage effect: ±0.25 % over operational voltage range

(Operational voltage range is [K3: 90 to 132 V AC], [L3: 180

to 264 V AC] when the DC output code is 4W or the

specified voltage is ≤ -9 V)

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 2000 V AC @ 1 minute