MODEL: LWTN

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

LWTN SPECIFICATIONS

ES-1976 Rev.2 Page 3/5

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. approx. 50 msec.

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.

Output Frequeny [Hz] = Calibration Range [kW] × VT Ratio

× CT Ratio / Pulse Unit [kWh/pulse] × 3600 [s]

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

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)

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

Ripple: 0.5 %p-p max.

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 2000 V AC @ 1 minute

(voltage input to current input to DC output to pulse output

to ground)

Impulse withstand voltage: 1.2 / 50 μsec., ±5 kV

(input to output or ground)