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INSTRUCTION MANUAL model WATT TRANSDUCER Thank you for choosing M-System. Before use,check specifications on the unit label. If you have any problems or questions with the product, please contact M-System's Sales Office or representatives. General Description The L-UNIT Model LWT/LWTN provides a DC output proportional to AC active power. • LWT: auxiliary power supply • LWTN: self-powered • Little ripple; stable output • Input-output isolated • Frequency output available for totalizing counter • No auxiliary power source is required for model LWTN Adjustments This module is factory calibrated within ±0.5% of reference input level. ZERO is adjustable to ±5%, SPAN to ±10%. A) ZERO: With minimum (0%) input, adjust output to 0%. B) SPAN: With full-scale (100%) input, adjust output to 100%. C) Check ZERO adjustment again with the minimum input. D) When ZERO value is changed, repeat the procedure A) to C). Troubleshooting When output is irregular, check the following points: A) Terminal wiring B) Power wiring and polarity (LWT) C) Input: Calculate the transducer input using the following equation and check that the result is within the available range described in the data sheet. Installation [Scale: mm(inch)] • Operating temperature: -10 to +55°C (23 to 131°F) • Operating humidity: 30 to 85% RH (non-condensing) Keep away from water, corrosive gas, dust and vibration. Wall or DIN rail mounting available. ■M5 SCREWS ■M4 SCREWS Transducer Input [W] = Measuring Range (PT Ratio) × (CT Ratio) D) Output: With current output, be sure that load resistance is within the permissible limit including wiring resistance. With voltage output, check that the minimum load is met. E) Frequency Output: Check that the load is less than 35V DC/100mA. 60 (2.36) 2–M5 50 (1.97) 60 (2.36) 60 (2.36) LWT/LWTN 2–M4 Terminal Connections Make wiring to terminals as shown in the following page. M-SYSTEM WARRANTY M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such product was originally purchased if such product has been used under normal operating conditions and properly maintained, M-System's sole liability, and purchaser's exclusive remedies, under this warranty are, at M-System's option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this warranty. To submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original sales invoice. THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM PRODUCT AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR SPECIAL DAMAGES OF ANY KIND WHATSOEVER. M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: (06) 6659-8201, Fax: (06) 6659-8510, E-mail: [email protected] P. 1 / 2 EM-1975 Rev.3 LWT / LWTN Terminal Connections ■3-PHASE/3-WIRE ■SINGLE-PHASE/2-WIRE SOURCE 1 2 SOURCE 1 2 3 FUSE U PT u V V v v U u P1 P2 P3 K FUSE 7 + 14 PULSE OUTPUT 15 8 – 16 11 + 12 – k 1S k 1L CT l L 3S l L 3L v P2 7 + 15 8 – PULSE OUTPUT DC OUTPUT K 2 12 – 1S 1L l 1 2 L 9 U(+) 5 14 9 U(+) POWER* POWER* 10 V(–) 6 10 V(–) LOAD ■3-PHASE/4-WIRE SOURCE N 1 2 3 FUSE U PT u V V v v U u P1 P0 P2 FUSE 7 + 14 PULSE OUTPUT 15 8 – 16 11 + DC OUTPUT K 12 – k 1S k 1L CT l L P1 CT SOURCE 1 N 2 l u k ■SINGLE-PHASE/3-WIRE L V 1 LOAD K PT 11 + DC OUTPUT K U 2S 2L U PT u P1 V v P2 U V U V u v u v P3 P0 14 7 + 15 8 – 16 11 + 13 12 – PULSE OUTPUT DC OUTPUT K K K 1 k 1S 2 k 5 9 U(+) 6 10 V(–) POWER* L k l l l L L LOAD 1L CT 2S 2L 3S 3L Pulse Output Connection Example ■Open Collector 7 + 8 – 1 2 3 4 5 9 U(+) 6 10 V(–) POWER* LOAD *For self-powered model, the auxiliary power supply terminals are deleted. The auxiliary-powered transducer model can be powered from the input voltage when the voltage is sufficiently stable and meets other supply voltage requirements. P. 2 / 2 EM-1975 Rev.3