V S UF OPEN IN 60Hz OE UF SL R120 V N1 U N F1 F2 R120 AVR Installation and maintenance
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR This manual concerns the alternator AVR which you have just purchased. We wish to draw your attention to the contents of this maintenance manual. SAFETY MEASURES Before using your machine for the first time, it is important to read the whole of this installation and maintenance manual. All necessary operations and interventions on this machine must be performed by a qualified technician.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR CONTENTS 1 - GENERAL DESCRIPTION .................................................................................................4 2 - OPERATION OF THE AVR .................................................................................................4 3 - TECHNICAL SPECIFICATION ...........................................................................................5 4 - MAIN FUNCTION OF THE AVR ................
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 1 - GENERAL DESCRIPTION 2 - OPERATION OF THE AVR The R121 automatic voltage regulator (AVR) is a compact, high-performance encapsulated unit. It incorporates the latest technology and efficient components to achieve a high degree of miniaturisation when used with 3-phase and 1-phase AC brushless generators within its input and output limits. The unit offers excellent reliability.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 3 - TECHNICAL SPECIFICATION 1) Sensing input - Voltage: 277 VAC ± 10% for 1-phase, 415 VAC line-to-line ± 10% for 3-phase, 2-line sensing. The AVR senses the true average of the line-to-line waveform. Use the resistor (SMD) network for trouble-free sensing and control of sensed voltage/ regulation.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 4 - MAIN FUNCTION OF THE AVR The AVR is powered by the line-to-neutral terminals of the AC generator with 240 VAC at 50/60Hz. The regulated sensing voltage is based on the AVR input power.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR The AVR builds up the generator voltage from its residual voltage to rated voltage. 5.2 - UNDER FREQUENCY KNEE POINT SETTING (UF) When the generator is loaded, the sensed voltage decreases and generates an error signal, which is required in order for the closed loop system to work. This function is provided to protect the AC generator from sustained low speed operation through a potentiometer.
Installation and maintenance Electric Power Generation 5243 en - 2022.02 / l R120 AVR 7 - TROUBLESHOOTING CHART Symptom No voltage build-up High voltage build-up Low voltage build-up Cause Fuse blown Action Check and replace Low residual voltage across U If the generator’s residual voltage at rated speed and N terminals is less than 2.5 VAC (L-N), disconnect the AVR and connect a 24 VDC battery, keeping F1 as positive and F2 as negative.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 8 - MULTIMETER CHECKS Equipment: Digital multimeter, Type: MECO or equivalent. Select Diode mode on the digital multimeter. The resistance between F1 and F2 (with the multimeter jack common applied to F1 of the AVR) should be between 0.4 and 0.6 kΩ, and vice versa (with the multimeter jack common applied to F2 of the AVR) should give INFINITY. The resistance between U and N1 should be between 200 kΩ and 260 kΩ.
Installation and maintenance Electric Power Generation 5243 en - 2022.02 / l R120 AVR 9 - STATIC TEST PROCEDURE For 3-phase circuit AVR (3PH) Model: R120 415 V, 3PH, 50 Hz, WITH NEUTRAL VAC 0-500 V LAMP 100 W 230 V VARIAC 8A, 415 V STATIC TEST CONNECTION DIAGRAM OF 3PH AVR This test should only be attempted after making sure that the AVR has passed all multimeter checks. Connect the AVR to the three-phase variable voltage source as shown in diagram 3 in this manual. 5.
Installation and maintenance Electric Power Generation 5243 en - 2022.02 / l R120 AVR For 1-phase circuit AVR (1PH) Model: R120 230 V, 1PH, 50 Hz, WITH NEUTRAL VAC 0-300 V LAMP 100 W 230 V VARIAC 8 A, 230 V STATIC TEST CONNECTION DIAGRAM OF 1PH AVR This test should only be attempted after making sure that the AVR has passed all multimeter checks. Connect the AVR to the single-phase variable voltage source as shown in diagram 1 in this manual. 5.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 10 - DIMENSIONS 94 mm 82 mm V S UF OE UF SL V 12 N1 U N F1 FUSE R120 2 x holes Ø 5.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR 11 - SPARE PARTS 11.1 - Designation Description Type Code AVR R120 4969966 11.2 - Technical support service Our technical support service will be pleased to provide any additional information you may require. For all spare parts orders or technical support requests, send your request to service.epg@leroy-somer.com or your nearest contact, whom you will find at www.lrsm.
Electric Power Generation Installation and maintenance 5243 en - 2022.02 / l R120 AVR Disposal and recycling instructions We are committed limiting the environmental impact of our activity. We continuously monitor our production processes, material sourcing and products design to improve recyclability and minimise our environmental footprint. These instructions are for information purposes only. It is the user’s responsibility to comply with local legislation regarding product disposal and recycling.
Service & Support Our worldwide service network of over 80 facilities is at your service. This local presence is our guarantee for fast and efficient repair, support and maintenance services. Trust your alternator maintenance and support to electric power generation experts. Our field personnel are 100% qualified and fully trained to operate in all environments and on all machine types. We have a deep understanding of alternator operation, providing the best value service to optimise your cost of ownership.
www.leroy-somer.com/epg Linkedin.com/company/leroy-somer Twitter.com/Leroy_Somer_en Facebook.com/LeroySomer.Nidec.en YouTube.com/LeroySomerOfficiel 5243 en - 2022.
