Panasonic M41A1G4L Operating Instructions Manual

Contents

– A-58 –Panasonic Corporation Electromechanical Control Business Divisionindustrial.panasonic.com/ac/e/ © Panasonic Corporation 2018 AQCTB02E 201806-E – A-59 –Panasonic Corporation Electromechanical Control Business Divisionindustrial.panasonic.com/ac/e/ © Panasonic Corporation 2018 AQCTB02E 201806-ESafety standard approved motorCalculation of motor capacityMotor selection6. Measurement of motor with gear headWhen a motor alone is coupled to equipment, the speed is measured at output shaft section using a strobe lightetc. In the case of a motor with a gear head, the speed is calculated from the following formula.n = i x n1n : Motor speed (r/min)n1 : Speed of gear output shaft or pulley etc. attached to it (r/min)i : Reduction ratio of gear head (e.g. i = 30 for 1/30)When measuring the speed of a gear output shaft having a large reduction ratio, do not measure the number ofrevolutions per minute, but measure the time taken for the gear output shaft to rotate 100 turns using a stopwatchafter putting a mark on the shaft. Then calculate the number of revolutions per minute from the measured time.Domestic and overseas standards approved motorsFor motors sold domestically or exported abroad, it is necessary to ensure the safety against “Fire, electric shockand injury” that meets the corresponding standards of each country. Among such standards are the ElectricalAppliance and Material Safety Law in Japan, the UL standard in the North American market, the CE marking inthe European market and the CCC marking in the Chinese market. We also provide products meeting thesesafety standards. The descriptions of these standards are shown below.Electrical Appliance and Material Safety Law (domestic law in Japan)This law is a domestic law in Japan intended to regulate the manufacture, sale, etc. of electrical appliances andto prevent the occurrence of fire, electric shock, injury, etc. attributable to electrical appliances by promoting self-activities of private enterprises for ensuring the safety of electrical appliances. Among the contents of the regula-tion are obligations of submission of manufacturing (export) business, conformance to technical standards andindication. Electrical appliances are classified into two groups: specific electrical appliances (equivalent to ko-typein the former law) and electrical appliances other than specific electrical appliances (otsu-type in the former law).On motors (electrical appliances other than specific electrical appliances) regulated by this law, a PSE mark isindicated and descriptions based on this law are shown.UL (CSA) Standard (to be considered when exporting motors to North America)This standard was established by the fire insurance company association in the United States of America. LikeJapan, low voltage (115 V, 60 Hz) is used in this region, and measures against fire in particular are stronglyrequired. Insulators used for UL-approved products are made of UL-approved incombustible materials. Inaddition, installation of an overheat protection device is required. In the case of motors with mounting surfacedimensions of 70 mm sq., 80 mm sq. and 90 mm sq., an automatic-reset thermal protector is incorporated. In thecase of motors with mounting surface dimensions of 60 mm sq., impedance protected motor design is used.The CSA standard is a necessary requirement for exporting to Canada. It is possible to put a c-UL mark onproducts inspected and approved by UL in accordance with the CSA standard in addition to the UL standard.Products bearing this c-UL mark are regarded as products conforming to CSA standard and therefore can be soldin Canada.• UL standard on motorUL1004-1 (motor) : Provisions concerning motor construction and materialUL1004-2 (thermal protection of motor) : Provisions concerning impedance protection of motorUL1004-3 (thermal protection of motor) : Provisions concerning thermal protection of motorUL840 (insulation coordination of equipment) : Provisions concerning base items of motor insulation7. Example of motor selectionApplication : Driving of conveyorVoltage : 100 VSpeed : 30 r/minWorking condition : ContinuousFrequency : 60 HzSelect a motor that meet the above.(1) Speed suitable for specificationsBecause the required speed is 30 r/min, the gearratio that realizes a rated motor speed (60 Hzarea) of 1500 r/min to 1550 r/min is 1500/30 to1550/30 = 50 to 51.67. Therefore use a gear ratioof 1/50.(2) Calculation of required torqueMeasure the approximate load with a spring balanceetc. Assume that it is 2.65 N·m (375.27 oz-in).After referring to our catalog, select M81X25G4Land install MXBG50B as a reduction gear.(3) Actual measurement of minimum startingvoltage, minimum stable voltage and speedAssume that the following are obtained as a resultof actual measurement.Minimum starting voltage: 75 VMinimum stable voltage: 55 VSpeed: 1700 r/min(4) From speed-torque curve of 4-pole 25 Winduction motorTs : Starting torque Ts = 0.16 N·m (22.66 oz-in)Tm : Stalling torque Tm = 0.25 N·m (35.4 oz-in)The torque is proportional to the square of the voltageand the following values are obtained.(Minimum starting torque)0.16 x ( ) 2= 9 x 10–2 N·m (12.75 oz-in)(Minimum required stalling torque)0.25 x ( ) 2= 7 x 10–2 N·m (9.91 oz-in)(Torque at motor speed of 1700 r/min)= 0.12 N·m (16.99 oz-in)From the above, it can be seen that this applicationis a constant torque load and that the 4-pole 25 Winduction motor still has a more than sufficientcapacity. In addition, as is evident from the S-Tcurve of the attached S-T data, Ts and Tm of the4-pole 15 W induction motor are as follows:Ts = 0.1 N·m (14.16 oz-in)Tm = 0.15 N·m (21.24 oz-in)Considering the voltage drop and variation whenused for conveyors, Ts and Tm of the 4-pole 15 Winduction motor at 90 V are assumed to be asfollows:Ts = 0.08 N·m (11.33 oz-in)Tm = 0.12 N·m (16.99 oz-in)When the voltage drop and variation or loadvariation is thought to be insignificant, the 4-pole 15W induction motor and gear head MX7G50B can beused. When the voltage variation or load variation issignificant, the 4-pole 25 W induction motor shouldbe used.7510055100• Conformance to UL and CSA• UL1004-1• CSAC22.2 No.100All products conform to these standards.• UL1004-2• CSAC22.2 No.776 W motors conform to these standards.• UL1004-3• CSAC22.2 No.77· Single-phase 2-pole motors conform to thesestandards.· These standards do not apply to single-phase 15to 90 W 4-pole motors wired as shown in wiringdiagrams on pp. A-60 to A-61.For example, when the thermal protector isconnected in series between power line andmotor white terminal (U1), this circuit becomescompatible.· These standards do not apply to 3-phase motors.Single-phasepowersourceMCCBMotorThermal protectorWhite (U1)Gray (U2)Black (Z2)CapacitorBlue (P)Blue (P)

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