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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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FSXXXSP Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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FSXXXSP Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
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7 / 52 page  SECTION 9 SECTION 1 35 Machine Tool indusTrial conTrol © Hammond Power Solutions Inc. Data subject to change without notice. maCHIne tool IndustrIal Control transformer seleCtIon Selecting a Control Transformer requires that you have first hand knowledge of the application for the transformer and that you understand some basic terms related to the selection process. By using the following information, you will be sure to select the HPS Imperator® Control Transformer which best meets your application. The HPS Imperator Series machine tool control transformers are specifically designed for high inrush applications requiring reliable output voltage stability. Designed to meet industrial applications where electromagnetic devices such as relays, solenoids, etc. are used, the HPS Imperator series transformers maximize inrush capability and output voltage regulation when electromagnetic devices are initially energized. To select the proper transformer, three characteristics of the load circuit must first be determined. They are total steady-state (sealed) VA, total inrush VA, and inrush load power factor. (a) the total steady state “sealed” VA is the amount of VA that the transformer must supply to the load circuit for an extended length of time. Simply add the total steady-state VA of all devices in your control circuit. The operating VA data of these components is available from the manufacturers. (B) t he total inrush Va is the amount of Va that the transformer must supply for all components in the control circuit which are energized together. Some consideration to the start-up sequence may be required. Inrush VA should be obtained from the device manufacturer. (C) The inrush load power factor is difficult to determine without detailed vector analysis of all the control circuit components. Such information is not generally available. Therefore, HPS is recommending that a 40% power factor be utilized. Although some other control transformer manufacturers still recommend a power factor of only 20%, HPS, through recent tests conducted on many popular brands of control devices, has determined that the 40% power factor value is more accurate. Once the above circuit variables have been determined, transformer selection is a six step process. sIX easY steps 1. Determine what your Primary (supply) and Secondary (output) voltage requirements are, as well as your required frequency (i.e. 60 Hz) 2. Calculate the Total Sealed VA of your circuit. (See Step A) 3. Calculate the Inrush VA by adding the inrush VA of all components being energized together. remember to add the sealed VA of all components that do not have inrush VA, (lamps, timers etc.) as they present a load to the transformer during maximum inrush. If the inrush for the components in your circuit are not known, assume a 40% Inrush Power Factor. 4. Calculate the Total Inrush VA using one of the two methods: A. Total Inrush VA = (Va sealed)2 + (Va inrush)2 or B. Total Inrush VA = Va sealed + Va Inrush note: method B will result in a slightly larger transformer being selected. 5. If the nominal supply voltage does not fluctuate more than 5%, then reference the 90% secondary voltage column in the regulation Data Table for the correct VA rating. If the supply voltage varies upwards of 10%, the 95% secondary voltage column should be used to size the transformer. Current standards require electromagnetic devices to operate reliably at a minimum of 85% of their rated voltage. However, contact life may be affected with continuous start-ups at that voltage level. Therefore, the minimum 85% secondary voltage column should only be used as a reference. 6. Using the regulation data tables below, select the appropriate VA rated transformer: A) With a continuous VA rating that is equal to or greater than the value in Step 2. B) With a maximum inrush VA equal to or greater than the value obtained in Step 4. To determine the correct HPS Transformer and its Catalog number, just refer to the tables in this catalog for the voltage ratings, frequency and corresponding VA required. It is recommended that a Control Transformer be sized at a 40% Power Factor. Some components in a circuit, such as electromagnetic devices, typically operate at that level due to their inherently lower power factor. Selecting a transformer at 40% Power Factor will more than adequately size the unit for all the various loads in the circuit. Hps Imperator® transformers reGulatIon data taBle Continuous Va Inrush Va @ 40% power factor transformer 85% 90% 95% nameplate secondary secondary secondary rating Voltage Voltage Voltage 50 75 100 150 250 350 500 750 1000 1500 330 350 620 895 1596 2464 3939 6422 9842 12797 259 258 467 699 1229 1889 2854 4778 7102 9018 192 170 321 512 880 1345 1819 3228 4530 5489 For VA sealed definition please refer to 1 (A). For VA inrush definition please refer to 1 (B). |
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