Mitsubishi Electric MELPRO-A Series Instruction Manual
Over current relay
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- Instruction manual (23 pages) ,
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- Instruction manual (17 pages)
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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-IL9553...
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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
5. The power supply can be derived from CT secondary. 3. The fault value record function is installed. 6. Panel cutout is the same as previous MELPRO-A series and E series. Ratings and Specifications Type name... - Page 7 Power consumption (CT) Normal：3.5VA Operating：4.5VA Unit-fixed type Unit-drawer type Unit-fixed type Case (Fig. 1-11) (Fig. 1-12) (Fig. 1-11) (Munsell color) (0.6B7.6/0.2) (0.6B7.6/0.2) (0.6B7.6/0.2) Mass Approx. 1.0kg Approx. 1.1kg Approx. 1.0kg (*) shows factory setting. JEP0-IL9553...
- Page 8 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.
- Page 9 Maximum acceleration: 300m/s Shock Direction: 3 directions in forward/backward, right/left, and up/down Criteria: No abnormality when applying two shocks in each direction Test circuit: Between all circuits and external box, between separate circuits, and between the poles of contacts Insulation Criteria: More than 10MΩ...
- Page 10 Time-lag element EI characteristic VI characteristic 1000 1000 Dial Dial ～ ～ ～ 0.25 0.25 0.5 1 1.5 2 0.01 0.01 Current (multiples to the setting) I Current (multiples to the setting) I �� 13.5 �� Extremely inverse (EI): × Very inverse (VI): ×...
- Page 11 Time-lag element NI characteristic DT characteristic 1000 1000 Dial Dial ～ ～ ～ 0.25 0.25 0.01 0.01 Current (multiples to the setting) I Current (multiples to the setting) I 0.14 �� �� Normal inverse (NI): × Definite time (DT): T = 2 × 0.02 ��...
- Page 12 Instantaneous element Sensitivity setting in 3-step characteristic 20% 40% 60% 80% 80 100 120 140 160 180 200 80 100 120 140 160 180 200 Current (multiples to the setting) % Current (multiples to the setting) % 2-step characteristic 3-step characteristic Fig.
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Page 13: Operating Description
Structure RUN indicated LED (Green) Numerical display LED It shows the result of self- Following item is displayed monitoring. lights by indicator select switch normal condition. setting. ・Current measurement CPU reset button ・Time lapse While this button is pressed, the ・Setting value relay function is locked and the ・Fault record... -
Page 14: Internal Connection Diagram
2. RUN display (Self-monitoring function) current, number of step, sensitivity, operation This relay monitors control voltage, electric characteristic, and frequency. circuit, and program data at all time. The RUN LED Fault record function (green) lights up in the normal condition. ①Display of fault records In the abnormal condition, the RUN LED goes out and When a fault occurs, the relay outputs the... - Page 15 External connection diagram (Example) In regard to terminal layout, refer to Fig. 1-7. a. CT secondary current tripping type (MOC-A3T) 【Tripping route】 no-fault condition, secondary current flows between CT secondary current tripping coil When a fault occurs, the CT secondary To alarm current flows between circuit...
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Page 16: Handling Precautions
Handling precautions 1. Panel mounting ⑤The RUN LED lights up in the normal condition when the ① Please connect input terminals relay current input is 1.5A or more. If it still turns off corresponding to the polarity of CT secondary output. when the current input exceeds 1.5A, please contact our (Refer to Fig. - Page 17 3. Operation characteristics test time test of time-lag element, it is recommended to ① When the test current (single phase) is gradually press the CPU reset button to lock the operation of this increased, the RUN display LED (green) lights at around relay.
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Page 18: Terminal Layout
Terminal layout × × × ○ C1R C2R × × C2T C1T ○ × × MOC-A3V-R MOC-A3V-RD ○ C1R T1R T2T T1T C1T × × MOC-A3T-R Do not connect to the "×" terminals, or the relay may not operate properly. The "○"... - Page 19 Drawing out and housing operation of subunit (Unit-drawer type) For unit-drawer type (RD type), it is possible to draw Before the subunit is to be drawn out, ensure that the out the subunit from the case without removing external following items are checked in order not to carry out the wiring, which makes easier to carry out inspection and work in hot-line condition.
- Page 20 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 21 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. 1-9. Fig. 1-9 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 22: External Dimensions And Panel Cut-Out
External dimensions and Panel cut-out φ140～φ142 2-M6 screw 11-M3.5 screw 2-φ7 hole Minimum pitch Fig. 1-11 MOC-A3V/A3T-R (Unit: mm) Same as the center of panel cut-out φ140～φ142 2-M6 screw 14-M3.5 screw 2-φ7 hole Minimum pitch Fig. 1-12 MOC-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 23 HEAD OFFICE ： 7-3 MARUNOUCHI 2-CHOME, CHIYODA-KU TOKYO, 100-8310, JAPAN First edition: Oct. 2020...