Оценок - 3, средний балл: 3.7
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Фрагмент инструкции
A rated 3000W generator can drive one or two 400W mercury lamps without power fac- tor correction capacitors. NOTE 2 : Nominal wattage of the fluorescent lamp generally indicates the output wattage of the lamp. Therefore, if the fluorescent lamp has no special indication as to the power consumption, efficiency should be taken into account as explained in item (5) on the following page. (3) Motor driven tools and light electrical appliances Generally the starting wattage of motor driven tools and light electrical appliances are 1.2 to 3 times lager than their running wattage. Example : A rated 250 W electric drill requires a 400 W generator to start it. (4) Initially loaded motor driven appliances such as water pumps, compressors, etc. These appliances require large starting wattage which is 3 to 5 times of running wattage. Example : A rated 900 W compressor requires a 4500 W generator to drive it. NOTE 1 : Motor-driven appliances require the aforementioned generator output only at the starting. Once their motors are started, the appliances consume about 1.2 to 2 times their rated power consumption so that the excess power generated by the generator can be used for other electrical appliances. -19- NOTE 2 : Motor-driven appliances mentioned in lets (3) and (4) vary in their required motor starting power depending on the kind of motor and start-up load. If it is difficult to determine the optimum generator capaciv, select a generator with a larger capacity. NOTE 2 : Motor-driven appliances mentioned in lets (3) and (4) vary in their required motor starting power depending on the kind of motor and start-up load. If it is difficult to determine the optimum generator capaciv, select a generator with a larger capacity. (5) Appliances without any indication as to power consumption Some appliances have no indication as to power consumption; but instead the work load (output) is indicated. In such a case, power consumption is to be worked out according to the numerical formula mentioned below. (Output of electrical appliance) = (Power consumption~ (Efficiency) Efficiencies of some electrical appliances are as follows: Single-phase motor l l l -l 0.6 to 0.75 The smaller the motor, the lower l l l l Three-phase motor * 0.65 to 0.9 II-the efficiency. l l l l l l l l l Fluorescent lamp l l 9 l -l 0.7 to 0.8 l l l l l Example 1 : A 40 W fluorescent lamp means that its luminous output is 40W. Its efficiency is 0.7 and accordingly, power consumption will be 40+0.7=57W. As explained in item(2), multiply this power consumption value of 57 W by 1.2 to 2 and you will get the figure of the necessary capacity of a generator. In other words, a genera- tor with a rated output of 1000 W capacity can light nine to fourteen 40W fluores- ,- cent lamps. Example 2 : Generally speaking, a 400 W motor means that its work load is 400 W. -. Efficiency of this motor is 0.7 and power consumption will be 400+0.7=570 W. When this motor is used for a motor-driven tool, the capacity of the generator should be multiple of 570W by 1.2 to 3 as explained in the Item (3). 570 (W) x I .2 to 3=684 (W) to1 710 (W) Applicable Wattage on/) Applications RGV12000 (60 Hz) IIncandescent Lamp, Heater 10000 I I IFluorescent Lamp, Electric Tool 4950 I I 1 Pump, Compressor I 2500 I -2o- NOTES : Wiring between generator and electrical appliances NOTES : Wiring between generator and electrical appliances Allowable current of cable Use a cable with an allowable current that is higher than the rated input current of the load (electrical appliance). if the input current is higher than the allowable current of the cable used, the cable will become excessively heated and deteriorate the insuia- tion, possibly burning it out. Table 7-2 shows cables and their allowable currents for your reference. 2. Cable length if a long cable is used, a voltage drop occurs due to the increased resistance in the conduc- tors decreasing the input voltage to the load (electrical product) As a result, the load can be damaged. Table 7-2 shows voltage drops per 100 meters of cable. Voltage drop indicates as V= &- X R XIX Q R means resistance (Q / 100 m) on the above table. I means electric current through the wire (A). Q means the length of the wire (m). The length of wire indicates round length, it means twice the length from generator to electrical tools. -2l- 7. 7. S 7-l MEASURING INSTRUMENTS (1) VOLTMETER AC voltmeter is necessary. The approximate AC voltage ranges of the voltmeters to be used for various types of generators are as follows : 0 to 150 V : Type with an output voltage ofllOor120V 0 to 300 V : Type with an output voltage of 220,230 or 240 V FOR AC 0 to 150 V, 0 to 330 V : Dual voltage type (2) AMMETER AC ammeter is necessary. An AC ammeter with a range that can be changed according to the current rating of a given generator is most desirable. (About 10 A, 20 A, 100 A) (3) FREQUENCY METER Frequency range : About 45 to 65Hz NOTE : Be careful of the frequency meter’s input volta...
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