Name- Watt transducer, LWT-11AO-R
Maker: M.SYSTEM CO.LTD
Model: LWT-11AO-R
Technical Specification:
24V DC 0-1000W 4-20mA DC USED
INPUT SPECIFICATIONS
Frequency: 50 or 60 Hz
• Voltage Input
Operational range: 0 – 120 % of rating
Overload capacity: 150 % of rating for 10 sec., 120 %
continuous
• Current Input
Operational range: 0 – 120 % of rating
Overload capacity: 1000 % of rating for 3 sec., 200 % for 10
sec., 120% continuous
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 12 V maximum; 10 V for [±]
output
• 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. 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]
