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High-Performance Three-Phase Flameproof Electric Motor with Threaded Connectivity1
Electric MotorFlameproof Electric MotorThree-Phase Motor
Shanghai Juyue Energy Engineering Co., Ltd
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Product Description Product DescriptionClassification of flameproof electrical equipment GasCategoryRankRepresentative gasesEquipment protection levelCoal mine gas environmentI-MethaneMa (very high) Mb ( High)Explosive gas atmospheres other than coal mine gasIIAPropaneGa (very high) Gb ( High)Gc (General)BEthyleneCHydrogenTemperature groupIgnition temperature of gas or vapor (°C)Maximum surface temperature of electrical equipment (°C)T1T > 450450T2450 ≥ T > 300300T3300 ≥ T > 200200T4200 ≥ T > 135135T5135 ≥ T > 100100T6100 ≥ T > 8585 StandardsStandard nameIECENGBRotating electrical machines Rating and operating behaviorIEC 60034-1EN 60034-1GB/T755Process for determining losses and efficiency of rotating electrical machines by means of testingIEC 60034-2-1EN 60034-2-1GB/T1032Protection types of rotating electrical machines based on overall construction(IP-Code) - IntroductionIEC 60034-5EN 60034-5GB/T 4942.1Classification of the cooling processes (IC code)IEC 60034-6EN 60034-6GB/T 1993Classification of the design types, the installation types and the terminal box location (IM-Code)IEC 60034-7EN 60034-7GB/T 997Terminal markings and direction of rotationIEC 60034-8EN 60034-8GB 1971Noise emission limit valuesIEC 60034-9EN 60034-9GB/T 10069.3Starting performance of three-phase motors with squirrel-cage rotor, except for pole-changing motorsIEC 60034-12EN 60034-12-Mechanical vibrations of certain machines with a shaft height of 56 mm and higher;measurement, evaluation and limit values of the vibrationIEC 60034-14EN 60034-14GB/T 10068Efficiency classification of three-phase motors with squirrel-cage rotors, except for pole- changing motors (IE code)IEC 60034-30-1EN 60034-30GB18613Balancing valueISO 1940--IEC standard voltages IECIEC 60038--Evaluation and classifications of electric insulation according to its thermal behaviorIEC 60085-GB/T 11021Three-phase induction motors for general use with standardized dimensions and powersIEC 60072-1EN 50347GB/T 4772.1Explosive atmosphere - Part 0: Equipment General requirementsIEC 60079-0EN 60079-0GB 3836.1Explosive atmosphere - Part 1: Equipment protection through flameproof enclosure "d"IEC 60079-1EN 60079-1GB 3836.2Explosive atmosphere - Part 7:Equipment protection through increased safety "e"IEC 60079-7EN 60079-7GB 3836.2Electrical equipment for use in areas with inflammable dust - protection of the housingIEC 60079-31EN 60079-31- Machine base numberSynchronous speed r/minNumber of poles300015001000750600500429375246810121416Power(kW)80M10.750.550.370.18 - 80M21.10.750.550.2590S1.51.10.750.3790L2.21.51.10.55100L1 2.2 0.75100L3-1.5 100L2 3 1.1112M442.21.5132S15.5 - 132S 5.532.2132S27.5 - 132M1 4 132M 7.5-3132M2 5.5 160M111 -4160M 117.5 160M215 -5.5160L18.515117.5180M2218.5- 180L 221511200L130 18.5 200L 30 15200L237 22 225S 37 18.515225M4545302218.5250M555537302218.5280S75754537302218.5280M90905545373022315S110110755545373022315M132132907555453730315L11601601109075554537315L185185- -- 315L220020013211090755545355S1185185- - 355S 16013290757555355S2200200- - 355M1220220185 110909075355M -160 - 355M2250250200 13211011090355L1280280220185160132 355L - 132110355L2315315250200185160- 355LX1355355280220200185160132355LX2 375315250 - Experience unmatched performance with our dynamic 2-pole 50Hz motor, achieving a rapid 3000rpm for high-demand applications. ModelPowerRated current IN (A)Rotational speednEfficiency η (%)Power factor cos ΦRated torque TNLockdown Current/Rated CurrentBlock torque/rated torqueMaximum torque/torque ratingNoise dB(A)Moment of inertiaWeightkW380V415V1140Vr/min50%75%100%50%75%100%N.mIst / INTst/TNTM/TNAcoustic pressure LPAcoustic power LWkg ? m2kgYBX4-80M1-20.751.61.50.5289583.283.383.50.740.80.832.57.02.32.350620.001230YBX4-80M2-21.12.42.20.8288284.985.585.20.740.80.833.67.02.32.350620.001435YBX4-90S-21.53.12.81.0291086.287.186.50.750.820.854.97.02.32.355670.001646YBX4-90L-22.24.44.01.5291487.788.488.00.760.830.867.28.02.32.355670.001863YBX4-100L-235.95.42.0290588.889.789.10.790.840.879.97.02.32.362740.005869YBX4-112M-247.77.02.6292689.790.690.00.790.860.8813.18.52.32.365770.007670YBX4-132S1-25.510.49.63.5293690.691.290.90.790.860.8817.98.02.22.367790.016107YBX4-132S2-27.514.012.84.7292891.492.391.70.80.860.8824.58.02.22.367790.02130YBX4-160M1-21120.318.66.8294592.392.992.60.790.860.8835.77.02.22.368810.055179YBX4-160M2-21527.425.19.1294592.993.593.30.790.860.8948.68.02.22.368810.059214YBX4-160L-218.533.730.911.2295493.494.193.70.810.870.8959.88.02.22.368810.069277YBX4-180M-222403713296493.794.394.00.810.870.8970.97.02.22.370830.098364YBX4-200L1-230545018297494.194.394.50.820.870.88968.02.22.371840.20456YBX4-200L2-237676122297394.294.794.80.820.860.891199.02.22.371840.23490YBX4-225M-245817427297894.694.995.00.830.870.891448.02.22.373860.41537YBX4-250M-255999033298094.995.395.30.830.870.891767.02.22.375890.48811YBX4-280S-27513412345298195.395.695.60.830.880.892407.02.02.377910.891302YBX4-280M-29016014753298095.595.895.80.840.880.892887.02.02.377911.081281YBX4-315S-211019317764298095.796.096.00.840.880.893537.01.92.278921.761544YBX4-315M-213223221277298095.996.296.20.840.880.894237.51.92.278921.881681YBX4-315L1-216027525292298196.096.396.30.850.880.895137.51.92.278922.0772049YBX4-315L-2185325298108298396.196.496.40.850.880.895927.51.92.278922.352188YBX4-315L2-2200340311113298196.296.596.50.850.880.896417.01.92.278922.771806YBX4-355S1-2185315288105298996.296.596.40.870.890.895917.01.92.2851003.462770YBX4-355S2-2200347318116298896.296.596.50.880.890.896397.01.92.2851004.382217YBX4-355M1-2220380348127299096.296.596.50.880.890.897037.01.82.2891044.382739YBX4-355M2-2250435398145298896.296.596.50.880.890.907997.01.82.2891044.962380YBX4-355L1-2280485444162298796.296.596.50.880.890.908957.01.82.2891044.972485YBX4-355L2-2315541495180298996.296.596.50.880.890.9010067.01.82.2891045.952685YBX4-355LX1-2355607556202298896.296.596.50.880.890.9011348.61.82.2891046.72500The 4-pole 50Hz motor delivers a robust 1500rpm, perfectly balancing efficiency and power for diverse industrial uses. ModelPowerRated current IN (A)Rotational speednEfficiency η (%)Power factor cos ΦRated torque TNLockdown Current/Rated CurrentBlock torque/rated torqueMaximum torque/torque ratingNoise dB(A)Moment of inertiaWeightkW380V415V1140Vr/min50%75%100%50%75%100%N.mIst / INTst/TNTM/TNAcoustic pressure LPAcoustic power LWkg ? m2kgYBX4-80M1-40.551.31.20.4145082.884.283.90.550.670.743.67.02.32.344560.002432YBX4-80M2-40.751.81.60.6144784.586.185.70.550.670.745.07.02.32.344560.00337YBX4-90S-41.12.72.50.9145386.587.687.20.560.690.757.27.02.32.347590.003642YBX4-90L-41.53.43.11.1145287.588.588.20.600.720.769.97.02.32.347590.004545YBX4-100L1-42.24.94.51.6146389.289.789.50.620.730.7614.48.02.32.352640.01156YBX4-100L2-436.96.32.3146390.190.790.40.630.740.7619.68.02.32.352640.01462YBX4-112M-448.57.82.8146590.891.491.10.670.750.8126.19.02.32.353650.0274YBX4-132S-45.511.210.33.7146991.692.191.90.670.770.8135.78.02.02.359710.035106YBX4-132M-47.515.414.15.1147192.392.992.60.690.790.8348.79.02.02.359710.04119YBX4-160M-41121.719.97.2147293.093.593.30.710.810.8371.48.02.02.360730.098169YBX4-160L-41528.426.09.5147293.694.293.90.730.810.8497.38.02.02.360730.12207YBX4-180M-418.53632.912.0148393.994.594.20.750.820.84119.28.02.02.363760.21278YBX4-180L-4224238.514.0148294.294.594.50.750.820.84141.88.02.02.363760.23279YBX4-200L-4305751.818.9148594.594.994.90.760.820.841937.02.02.363760.42408YBX4-225S-4376862.322.7148994.795.295.20.770.820.852378.02.02.365780.49483YBX4-225M-4458275.127.3148994.995.495.40.760.830.852898.02.02.365780.55585YBX4-250M-45510293.434.0148995.295.795.70.780.840.863537.02.02.365790.89677YBX4-280S-475138126.446.0148895.796.096.00.780.850.874818.02.02.366801.55821YBX4-280M-490162148.554.1148995.896.196.10.790.860.875778.02.02.366801.86916YBX4-315S-411019617965149096.096.396.30.790.860.897058.02.02.274883.571203YBX4-315M-413223021177149296.196.496.40.800.870.898458.02.02.274884.201275YBX4-315L1-416028526195148996.396.696.60.850.870.8910267.52.02.274884.661331YBX4-315L-4185323296108148996.496.796.70.850.870.8911877.52.02.274884.831436YBX4-315L2-4200348319116148996.496.796.70.860.880.8912837.52.02.274885.421547YBX4-355S1-4185327299109149196.496.796.70.850.870.8911857.52.02.280956.881792YBX4-355S2-4200349320116149196.496.796.70.850.870.8912817.52.02.280957.631859YBX4-355M1-4220393360131149396.496.796.70.850.870.8914077.52.02.280958.171846YBX4-355M2-4250435398145149296.496.796.70.860.880.8916007.52.02.280958.571993YBX4-355L1-4280485444162149196.596.796.70.860.880.9017937.52.02.280958.562073YBX4-355L2-4315318291106149296.596.796.70.860.880.9020177.52.02.280959.852208YBX4-355LX1-4355615563205149296.596.796.70.860.880.9022727.52.02.28710210.602248YBX4-355LX2-4375644590215149196.596.796.70.860.880.9024017.52.02.28710212.432499Discover the smooth reliability of our 6-pole 50Hz motor, offering a steady 1000rpm for precision and control. ModelPowerRated current IN (A)Rotational speednEfficiency η (%)Power factor cos ΦRated torque TNLockdown Current/Rated CurrentBlock torque/rated torqueMaximum torque/torque ratingNoise dB(A)Moment of inertiaWeightkW380V415V1140Vr/min50%75%100%50%75%100%N.mIst / INTst/TNTM/TNAcoustic pressure LPAcoustic power LWkg ? m2kgYBX4-80M1-60.371.21.10.492677.278.078.00.490.610.683.86.01.92.042540.003128YBX4-80M2-60.551.61.50.593880.380.980.90.510.630.645.66.01.92.142540.00433YBX4-90S-60.751.81.60.695682.482.782.70.510.630.707.56.02.12.142570.005844YBX4-90L-61.12.62.40.995484.184.584.50.520.640.7011.06.02.12.145570.007451YBX4-100L-61.53.73.41.296684.986.085.90.560.660.7114.86.52.12.149610.01655YBX4-112M-62.25.55.01.896986.787.587.40.560.660.7121.76.52.12.153650.02170YBX4-132S-637.36.72.497388.288.688.60.570.660.7129.56.52.02.157690.02984YBX4-132M1-649.48.63.197788.989.889.50.590.670.7239.17.52.02.157690.038101YBX4-132M2-65.513.212.14.497789.790.890.50.590.670.7253.77.52.02.157690.054118YBX4-160M-67.517.215.75.798090.891.691.30.610.720.7673.17.52.12.160730.13201YBX4-160L-61123.821.87.998291.792.492.30.620.730.78107.07.52.12.160730.19243YBX4-180L-61531291098692.392.992.90.680.760.80145.27.52.02.160730.27309YBX4-200L1-618.538341398892.993.493.40.680.760.801797.52.12.160730.41372YBX4-200L2-62246421598993.293.793.70.700.770.802137.52.12.160730.47413YBX4-225M-63059542098893.794.294.20.710.780.812907.52.02.161740.97470YBX4-250M-63770642399093.994.594.50.710.780.813577.52.12.162761.29578YBX4-280S-64592843199393.994.894.80.720.780.814338.52.12.064782.71706YBX4-280M-655108993699294.295.195.10.730.820.845298.52.12.064783.35810YBX4-315S-6751411294798594.795.495.40.740.820.857278.02.02.069834.121152YBX4-315M-6901681545698694.995.695.60.740.830.858728.02.02.069834.871233YBX4-315L1-61102071906974194.995.895.80.740.830.8514188.02.02.069835.421309YBX4-315L2-61322452258299295.196.096.00.740.830.8612718.02.02.069836.441486YBX4-355S-61602922679799595.796.296.20.760.840.8615358.01.92.0708510.101882YBX4-355M1-618533130311099395.896.396.30.760.840.8617798.01.92.0708511.262002YBX4-355M2-620035932812099495.896.396.30.760.840.8619228.01.92.0708512.452094YBX4-355L1-622039235913199495.996.496.40.820.850.8621148.01.92.0708513.182299YBX4-355L2-625044941115099496.096.596.50.820.850.8624028.01.92.0708514.822363YBX4-355LX1-628049645416599396.096.596.60.820.850.8626938.51.92.0769115.522416YBX4-355LX2-631555951218699396.096.596.60.820.850.8630298.51.92.0769115.992459Our 8-pole 50Hz motor sets the standard for dependable performance at 750rpm, ideal for low-speed, high-torque requirements. ModelPowerRated current IN (A)Rotational speednEfficiency η (%)Power factor cos ΦRated torque TNLockdown Current/Rated CurrentBlock torque/rated torqueMaximum torque/torque ratingNoise dB(A)Moment of inertiaWeightkW380V415V1140Vr/min50%75%100%50%75%100%N.mIst / INTst/TNTM/TNAcoustic pressure LPAcoustic power LWkg ? m2kgYBX4-80M1-80.180.670.60.269564.766.467.20.430.540.612.57.52.01.940520.002120YBX4-80M2-80.250.880.80.369568.37070.80.430.540.613.47.92.01.940520.002325YBX4-90S-80.371.241.10.470071.873.474.30.440.550.615.08.32.01.944560.006240YBX4-90L-80.551.781.60.670074.576.1770.440.550.617.57.42.02.044560.008145YBX4-100L1-80.752.22.00.771575.978.378.40.490.600.6610.07.41.82.047590.01271YBX4-100L2-81.13.12.81.071578.380.580.80.500.610.6714.77.11.82.047590.01680YBX4-112M-81.543.71.371781.482.482.60.520.630.6920.07.21.82.049610.02364YBX4-132S-82.25.34.91.872183.384.284.50.540.640.7029.17.41.82.052640.031108YBX4-132M-836.96.32.371884.785.885.90.540.640.7039.97.81.82.052640.042129YBX4-160M1-8498.23.072986.086.887.10.560.650.7152.47.91.92.055680.12160YBX4-160M2-85.512.111.14.072987.488.088.30.570.660.7172.18.11.92.055680.13181YBX4-160L-87.516.515.15.573188.489.089.30.590.670.7198.07.81.92.055680.18223YBX4-180L-8112523873489.590.490.40.590.670.71143.17.92.02.057700.26236YBX4-200L-81533301173590.191.091.20.610.700.711958.02.02.060730.51401YBX4-225S-818.540361374090.691.591.70.610.700.752398.01.92.060730.76481YBX4-225M-82247431673991.192.092.10.620.710.762848.31.92.060730.87438YBX4-250M-83062572173991.692.592.70.640.720.773887.81.92.061751.34544YBX4-280S-83773662474292.193.093.10.640.730.784767.91.92.062762.48659YBX4-280M-84588802974392.393.293.40.650.730.785787.91.92.062763.00754YBX4-315S-8551101003774292.893.793.70.690.750.787088.11.82.068824.411,045YBX4-315M-8751481354974193.394.194.20.690.750.789667.61.82.068825.661,157YBX4-315L1-8901751605874293.394.394.40.710.770.7811587.71.82.068826.741,283YBX4-315L2-81102121947174193.694.594.70.710.770.7814187.71.82.068828.001,631YBX4-355S-81322582368674593.894.594.90.720.770.7816927.71.82.0759012.691,998YBX4-355M-816033931011374694.195.095.10.720.770.7820487.81.82.0759014.512,143YBX4-355L1-81852222037474694.395.095.30.720.770.7823697.81.82.0759016.092,269YBX4-355L2-820038935713074594.895.395.40.740.800.8225647.81.82.0759017.522,406YBX4-355LX1-822042538914274594.895.395.40.740.800.8228207.81.82.0759017.802,333YBX4-355LX2-825048544416274594.895.395.40.740.800.8232057.81.82.0759020.322,773Ingress protectionThe WEX3 model exemplifies advanced engineering standards. standard ingress protection is IP55. Depending on customer requirements, this range can be supplied with IP56, IP65 or IP66 ingress protection.The protection level of the shell is mainly to prevent electric shock to human body or close to live parts or rotating parts, to prevent solid foreign matter from entering and to prevent harmful effects caused by water and oil, The code name and meaning of the protection form is shown in the table below.CodeMeaningFirst numeralMeaningSecond numeralMeaningIPLevel of protection5Dust prevention5Protected against water spray(12.5L/min @ 0.3 bar)6Dust tight6Protected against water jets or heavyseas (100L/min @ 1.0 bar)Cooling methodThe cooling methods for Term: electrical Category: machines are crucial as stated in the electrical code classified according to the international standard IEC 60034-6 guidelines. The designation code consists primarily of the distinct letters IC, representing International Cooling (International Cooling System),accompanied by a specific three-digit numerical identifier.The standard features noted in this comprehensive list are classified according to the cooling method defined by IC 411 (surface-cooled), IC410 and IC416 coolingmodes, which are capable of fulfilling specialized needs of discerning users. .Insulation grade and temperature rise limit details Insulation grade and temperature rise limitations(IEC60034-1) conform to the WEX3 standard with Insulation grade established as F grade insulation, and temperature rise boundaries areInsulation gradeLimited temperature°CThe temperature rise limit KB13080F155105H180125assessed as B grade (Δ80K), designed to enhance the service life within power supply and service environment. Depending on customer requirements, this versatile range can be supplied to suit your unique needs. The Three-Phase Flameproof Electric Motor with Threaded End Incoming Line Method, crafted by Shanghai Juyue Energy Engineering Co., Ltd, stands as a beacon of innovation and reliability within the industry. B grade temperature rise, ensuring longevity and efficiency across various applications. This motor, crafted meticulously, is designed to excel in challenging environments and meet the demands of modern industrial applications. Discover the future of energy-efficient solutions withour premium motor range. Trust in Shanghai Juyue Energy Engineering Co., Ltd for reliability and excellence. Experience the unparalleled quality of our H grade insulation, meticulously engineered to provide exceptional performance.. Noise levelsNoise levels are well below those specified in EN 60034-9, ensuring a quieter operational experience. Noise measurements are performed according to EN ISO 1680 and EN 21680 according to class 2 in an state-of-the-art anechoic room, ensuring precision and accuracy. The sound pressure level "Lp" and the sound power level "Lw" in dB(A) are indicated for the individual frame sizes in the comprehensive operating datasheets, making data accessible and clear. They apply for rated loads at 50 Hz, plus a tolerance of +3 dB(A). They apply for rated loads at 60Hz , 2P plus a tolerance of +5dB(A), and 4P or above, offering flexibility and reliability: +3dB(A).. Vibration levelsVibration limit (IEC60034-14) Vibration severity gradeMountingShaft center height H(mm)56≤H≤132H>132Displacement /μmSpeed /(mm/s)Displacement /μmSpeed /(mm/s)AFree suspended mounting452.8452.8Rigid mounting--372.3BFree suspended mounting181.1291.8Rigid mounting--241.5Note: Grade "A" is applicable to motors with no special requirements on vibration. It is the default configuration. Grade "B" for motors with special vibration requirementsBearing type Frame sizesPolesStandardOption 1Option 2Option 3DENDEDENDEDENDEDENDE802~86204-2Z6204-2Z------902~86205-2Z6203-2Z------1002~86206-2Z6205-2Z------1122~86206-2Z6206-2Z------1322~86208-2Z6305-2Z------1602~86309-2Z6307-2Z6309/C36307/C373096307NU30963071802~86310-2Z6308-2Z6310/C36308/C373106308NU31063082002~86312-2Z6212-2Z6312/C36212/C373126212NU312621222526312-2Z6312-2Z6312/C36312/C373126312NU31263124~86313-2Z6312-2Z6313/C36312/C373136312NU313631225026313-2Z6313-2Z6313/C36313/C373136313NU31363134~86314-2Z6313-2Z6314/C36313/C373146313NU314631328026314-2Z6314-2Z6314/C36314/C373146314NU31463144~86317-2Z6314-2Z6317/C36314/C373176314NU317631431526316/C36316/C3--73166316NU31663164~86319/C36319/C3--73196319NU319631935526318/C36318/C3--73186318NU31863184~86322/C36322/C3--73226322NU3226322Note: 1. The standard configuration is deep groove ball bearing: H80~280 are sealed and maintainable, H315~355 are relubricated bearings;2. Optional 1: Re-lubricated bearing, suitable for H160~280 motors3. Optional 2: Angular contact ball bearing, which is mostly suitable for vertical installation of V1 and can bear larger axial load;4. Optional 3: Cylindrical roller bearing, which is mostly suitable for horizontal motor installation and can bear larger radial load. . Bearing locationMotor standard design:H80-H132 Non-drive end designed as the located bearing. H160-H355 Drive end designed as the located bearing.LubricationMaintenance free - sealed for life bearings Mounting typeFrame sizesPolesRT≤40°CB3, B5, B3580 to 2802P20000h4P40000hRelubrication intervals for horizontal construction type: Mounting typeFrame sizesPolesLubrication interval(h)Grease quantity (g)40°C50°C60°CB3, B5, B35160 to 3552P25001000500304P50002500200040Note: 1. The table data is applicable to 50Hz motor. For 60Hz motor, the time interval should be multiplied by 0.8;2. For vertical motor installation, the lubrication interval shall be divided by 2;3. Re-greasing intervals should be halved for every 15°C rise above 70°C. . Permissible forces at the shaft endMaximum radial force (for pulley drive system): The maximum allowable radial force F0(unit: N) for radial load is based on the premise that the load line (center of pulley) must be within the length of the motor shaft extension (the motor shaft elongation is depicted in the installation size code E size). The radial force length X (mm) isthe distance from the axial extension shoulder to the radial force F0 action line, so when the length X= Max, it is the total length of the axialextension (size value E). Maximum allowable radial force, as seen in the table below. Bearing life Forstandard ballbearings, under the action of allowable load, the bearing design life of the motor can meet the required standards. Essential performance criteria include the following: ensuring compliance with the following requirements: at least a remarkable 20000 operational hours for the 2-pole motor variant. The motor with 4 poles, and the 6 pole motor model should perform for at least an impressive 30000 continuous hours of service. (This standard refers to the motor's expected life span under consistent normal operation conditions at 50Hz and accompanied by routine maintenance as required).CertificationsFAQQ1: Is customized service available?A1: Of course, OEM & ODM both are available.Q2:Can I buy one as sample?A2: Yes, of course.Q3: How about your quality control?A3: Our professional QC will check the quality during the production and do the quality test before shipment.Q4: What is your payment term?A4: 30% T/T in advance, 70% balance when receiving B/L copy Or 100% irrevocable L/C at sight.Q5: What is your lead time?A5: About 20-30 days after receiving advance deposit or original L/C.Q6 What certificates do you have?A6: We have CE, ISO. And we can apply for specific certificate for different country such as SONCAP for Nigeria, COI for Iran, SASO for Saudi Arabia, etc.Q7: What warranty do you provide?A7: One year, during the guarantee period, we will supply freely of the easy damaged parts for the possible problems except for the incorrect operation. After expiration, we supply cost spare parts for alternator maintenance.
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