Related Manuals for Mitsubishi Electric MELPRO A Series
Summary of Contents for Mitsubishi Electric MELPRO A Series
- Page 1 Request Ensure that this Instruction Manual is delivered to the end users and the maintenance manager. JEP0-IL9556...
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Page 2: Safety Precautions
－ Safety precautions － Before installation, operation, maintenance, and inspection, please be sure to read this instruction manual and all other attached documents thoroughly in order to work safely with the equipment. Please ensure that you fully understand the equipment, safety information, and precautions that need to be taken before working with the equipment. -
Page 3: Maintenance And Inspection
＊The equipment must only be operated and handled by qualified personnel. Otherwise, there are risks of electric shock, injury, failure, malfunction, and maloperation. ＊Handling and maintenance of the equipment must only be carried out after gaining a thorough understanding of the instruction manual. - Page 4 MITSUBISHI ELECTRIC CORPORATION prior to such applications. If the user applies MITSUBISHI ELECTRIC CORPORATION products to such applications without any contact to our technical section, MITSUBISHI ELECTRIC CORPORATION shall not be liable for any items and not be insured, independently from mentioned in this clause.
- Page 5 5. Onerous repair term after discontinuation of product (1) MITSUBISHI ELECTRIC CORPORATION shall accept onerous product repairs for 7 years after production is discontinued. (However, the product which was made over 15 years is recommended to replace.) (2) Product supply (including repair parts) is not available after production is discontinued.
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Page 6: Ratings And Specifications
MUV-A3 Series Undervoltage Relay [Standard: JEC 2520 (2018)] Features 1. Alert function which detects the difference between 4. The power supply can be derived from VT secondary. setting frequency and injected frequency. 5. Panel cutout is the same as previous MELPRO-A series 2. - Page 7 Characteristics Item Characteristics Ambient temperature: –20 to +60℃ (Under the state where dew condensation or freezing does not occur) Relative humidity: 30 to 80% on daily average Standard use Altitude: 2000m or lower conditions ・The state where abnormal vibration, shock, and inclination are not applied. ・The state where it is not exposed to harmful gas, excessive dust, and water droplet or vapor.
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Page 8: Operating Description
Structure Test button RUN indicated LED (Green) By turning the indicator select It shows the result of self- switch to "TEST" and pushing monitoring. It lights up in "TEST" button for 2 seconds or normal condition. more, output contact can be forced to operate (except for Numerical display LED the case of LOCK setting). -
Page 9: Internal Connection Diagram
3. Numerical display function record, the records are displayed starting from By switching the position of the indicator select latest record oldest switch, following items can be displayed on the approximately 2 second intervals. The relay can numerical display LED. save the newest five phenomena. -
Page 10: Handling Precautions
External connection diagram (Example) a. Voltage tripping type a-1 VT from power side a-2 VT from load side To alarm MUV-A3V circuit To alarm Voltage MUV-A3V circuit tripping coil Voltage tripping coil Pallet 52a Pallet switch switch b. No-voltage tripping type ●Connect line. - Page 11 Test 3. Operation characteristics test A relay test is carried out sufficiently before shipment, but at the following cases, it is recommended the test ①When the test voltage is gradually increased, the RUN should be carried out again. display LED (green) lights at around 50V. This indicates a.
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Page 12: Terminal Layout
Terminal layout × × × ○ × × ○ × × MUV-A3V-R MUV-A3V-RD Do not connect to the "×" terminals, or the relay may not operate properly. The "○" terminal is junction terminal for grounding wire if there was grounding wire in the existing relay. Fig. - Page 13 1. Procedure of drawing out Cover Drawer fixing screw ① Open the cover and remove the ② Close the cover and pull out the ③ Support the frame of subunit and drawer fixing screw. subunit with your finger hooked pull out. on the drawer handle on both sides.
- Page 14 Handling of the cover 1. Opening and closing Please open the cover by placing your fingertip on the convex part in the right side of the cover as shown in Fig. 4-6. Fig. 4-6 2. How to replace the cover ･Removing the cover Open the cover, and lightly push up the upper side of the cover from the inner surface.
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Page 15: External Dimensions And Panel Cut-Out
External dimensions and Panel cut-out φ140～φ142 2-φ7 hole Minimum pitch Fig. 4-8 MUV-A3V-R (Unit: mm) Same as the center of panel cut-out Fig. 4-9 MUV-A3V-RD (Unit: mm) Improvement on the reliability of protection function Any parts and materials applied to the protection relay have limited lifetime which will bring the degradation to the relay. - Page 16 HEAD OFFICE ： 7-3 MARUNOUCHI 2-CHOME, CHIYODA-KU TOKYO, 100-8310, JAPAN First edition: Jan. 2021...