Inverter Welding - 0 views

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  #1 Damon Lester on 05 May 12

   

  Inverter Welder
  
  It is also recommended to wait a period of time for all internal Filter Capacitors to discharge. This time varies, and is based mostly on the time continuous of the capacitors and bleed resistors (T=RC).
  
  The following actions really should be carried out:
  
  1. Check the functionality of the Power Switch. Verify that it has continuity in the ON position, and provides a disconnect (is open circuit) in the OFF place. Check all poles of the Switch.
  
  two. If the Inverter is capable of operating at numerous input Voltages, confirm the performance of any external voltage choice Switches.
  
  three. When the Inverter is 1st powered up the Bus capacitors (Major filter capacitors) are pre-charged for many seconds. This is to limit the inrush existing, as a capacitor appears as a quick circuit to the incoming electrical power supply (Mains input Supply) at time equal to zero. If this is not completed, the Input Rectifier and Main Electrical power Switch would have to supply infinite existing throughout this time (an extremely hard situation that finally results in component failure). A substantial wattage resistor limits this initial existing. Verify that this resistor is not open circuit, or degraded.
  
  four. Visually examine the Bus Capacitors. These are commonly big Radial electrolytic Capacitors. Verify that the circumstances are not distorted, and that they are sealed (not leaking electrolyte). Ensure that the Bus Capacitors are totally discharged. Measure the value of the capacitors employing a Capacitance meter.
  
  five. With a DVM (Digital Volt Meter) positioned in the Diode place, confirm that the Mains input Rectifier, and Secondary output diodes are practical. The diodes ought to show a forward voltage drop of among .two to .8V DC when the Anode is positive in respect to the Cathode. An Open circuit problem (displayed as OL on some DVM's) will be shown when the probes are reversed.
  
  six. The switching components in the Primary and Secondary circuits of the Principal Transformer are generally IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal Oxide Semiconductor Field Effect Transistor) parts. The output characteristics of each gadgets are comparable ample to carry out a straightforward test using a DVM (Digital Volt Meter) positioned in the Diode place. If the device is an IGBT, connect the optimistic lead to the Emitter Terminal and the unfavorable lead to the Collector Terminal. Some gadgets have a protection diode across the Collector and Emitter junctions to guard against voltage transients from Inductive loads. If this is the case, confirm a forward voltage drop of in between .two to .8V DC. Otherwise, there will be an Open Circuit condition. Reverse the DVM leads, and confirm an Open circuit situation. If the gadget is a MOSFET, connect the constructive lead to the Source Terminal and the unfavorable lead to the Drain Terminal. Some gadgets have a protection diode across the Drain and Supply junctions to guard against voltage transients from Inductive loads. If this is the situation, confirm a forward voltage drop of between .two to .8V DC. Or else, there will be an Open Circuit issue. Reverse the DVM leads, and verify an Open circuit problem.
  
  A far greater strategy of performing Practical Check of these components is to employ an IGBT or MOSFET Tester.

   

  <div class="cArrow"> </div><div class="cContentInner"><a href="http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=180536355997" rel="nofollow">Inverter Welder</a><br /><br />It is also recommended to wait a period of time for all internal Filter Capacitors to discharge. This time varies, and is based mostly on the time continuous of the capacitors and bleed resistors (T=RC).<br /><br />The following actions really should be carried out:<br /><br />1. Check the functionality of the Power Switch. Verify that it has continuity in the ON position, and provides a disconnect (is open circuit) in the OFF place. Check all poles of the Switch.<br /><br />two. If the Inverter is capable of operating at numerous input Voltages, confirm the performance of any external voltage choice Switches.<br /><br />three. When the Inverter is 1st powered up the Bus capacitors (Major filter capacitors) are pre-charged for many seconds. This is to limit the inrush existing, as a capacitor appears as a quick circuit to the incoming electrical power supply (Mains input Supply) at time equal to zero. If this is not completed, the Input Rectifier and Main Electrical power Switch would have to supply infinite existing throughout this time (an extremely hard situation that finally results in component failure). A substantial wattage resistor limits this initial existing. Verify that this resistor is not open circuit, or degraded.<br /><br />four. Visually examine the Bus Capacitors. These are commonly big Radial electrolytic Capacitors. Verify that the circumstances are not distorted, and that they are sealed (not leaking electrolyte). Ensure that the Bus Capacitors are totally discharged. Measure the value of the capacitors employing a Capacitance meter.<br /><br />five. With a DVM (Digital Volt Meter) positioned in the Diode place, confirm that the Mains input Rectifier, and Secondary output diodes are practical. The diodes ought to show a forward voltage drop of among .two to .8V DC when the Anode is positive in respect to the Cathode. An Open circuit problem (displayed as OL on some DVM's) will be shown when the probes are reversed.<br /><br />six. The switching components in the Primary and Secondary circuits of the Principal Transformer are generally IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal Oxide Semiconductor Field Effect Transistor) parts. The output characteristics of each gadgets are comparable ample to carry out a straightforward test using a DVM (Digital Volt Meter) positioned in the Diode place. If the device is an IGBT, connect the optimistic lead to the Emitter Terminal and the unfavorable lead to the Collector Terminal. Some gadgets have a protection diode across the Collector and Emitter junctions to guard against voltage transients from Inductive loads. If this is the case, confirm a forward voltage drop of in between .two to .8V DC. Otherwise, there will be an Open Circuit condition. Reverse the DVM leads, and confirm an Open circuit situation. If the gadget is a MOSFET, connect the constructive lead to the Source Terminal and the unfavorable lead to the Drain Terminal. Some gadgets have a protection diode across the Drain and Supply junctions to guard against voltage transients from Inductive loads. If this is the situation, confirm a forward voltage drop of between .two to .8V DC. Or else, there will be an Open Circuit issue. Reverse the DVM leads, and verify an Open circuit problem.<br /><br />A far greater strategy of performing Practical Check of these components is to employ an IGBT or MOSFET Tester.</div>

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