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Flashcards

Battery Chargers

wd4ngi Electronics Grado Medio English 48 cards

Cards in this deck (48)

  1. 1The primary purpose of our plant battery chargersOur source of DC voltage for the DC busses
    Converting AC to DC
    Keeping the DC voltage Constant/Regulated
    Limiting the current when recharging batteries
    Keeping our batteries fully charged and in a standby state, or recharging the batteries after depletion of their charge ( normally after a battery discharge test).
  2. 2Serves to protect the batteries from being drained in the event of a charger shut down due to AC input voltage loss.X306 relay contact
  3. 3The input transformer which steps down the 480 VAC input voltage to 140 VAC.T301
  4. 4What is the timing of the gate signals is controlled by ?charger control board
  5. 5The voltage at which a battery is maintained after being fully chargedFloat Voltage 131.57 to 132.75 VDC
  6. 6The “Higher” voltage level which “stirs” or prevents the electrolyte fluid from stratifying, it brings the cells back to a full charge, it helps to remove sulfation from the plates (sulfation occurs as the cells are discharged).Equalize Voltage 137.47 to 138.65 VDC
  7. 7This the actual rating of the charger itself (how much DC current it is capable of delivering). The charger is sized according to the battery bank and the other loads on the DC system.Charger current rating
  8. 8The concept of limiting the amount of current the charger puts out to protect the battery from damage. After the battery has been discharged, during the recovery equalize recharge, the battery could, if left unchecked demand so much current from the charger, that the DC system could be damaged from excessive heat etc…Current Limit
  9. 9This concept is used when using two chargers are connected to the same loads. We use this scheme for our safety related DC buses. If one charger shuts down, the other one will assume all the demand.Load Sharing
  10. 10Provides protection to the charger input cabling and to the primary side of the input transformer T301.AC Input breaker (B301),
  11. 11Provides fault protection for the output cabling and components of the charger.DC output breaker (B302)
  12. 12Charger input voltage480VAC
  13. 13Charger output voltage130 V DC
  14. 14Rectification of AC VoltageConverting AC to DC
  15. 15Provides a visual indication of the charger output in terms of voltage.DC Voltmeter
  16. 16Provide a visual indication of the charger output in terms of current.DC Ammeter
  17. 17Device that ensures that the equalize charge will only last a predetermined time, and then will return the charger to the normal float mode of operation.Equalize Timer
  18. 182 1/2 on the equalizer timer represents what amount of time?25 hours
  19. 19Flashing green on the equalize timer means what?Charger is equalizing
  20. 203 phase power transformer that supplies 140 VAC to the power rectifier elements.T301
  21. 21300 amp fuses that provide over current protection for the rectifier elements.Fuses F301- F306
  22. 22the filter (choke) that will smooth out the DC outputL301
  23. 23individual SCR’s that make up the full wave 3 phase bridge.Q301-Q312
  24. 24filter that helps to smooth out the charger output, as well as aiding voltage and current regulation.Filtering Choke L301
  25. 25is used to prevent the battery from being able to discharge itself through the charger, in case the charger shuts down while still being connected to the battery.D305 “Blocking Diode”
  26. 26The purpose of this charger component is to generate gate signals, for firing of the SCR’scontrol board
  27. 27master control boardx302
  28. 28slave control boardX304
  29. 29Additional Functions of the Control Board:Ramps up the charger slowly, to avoid a large surge of current that could damage the charger components.
    The voltage control circuit regulates the output voltage of the charger during normal operation.
    Overvoltage Protection/ Max Voltage Clamp
    Current Limit
    Load Sharing
  30. 30DC Noise Suppression BoardX301
  31. 31Initiates “Charger Failure” local LightX306
  32. 32Initiates signal to “Trouble Board” upon a fan failureX311
  33. 33Initiates signal to “Trouble Board” when loss of AC input is detected on any of the 3 AC input phases.X312
  34. 34Initiates signal to “Trouble Board” as the Charger Failure local light turns on.X314
  35. 35The board that receives any of the four inputs, and generates a common alarm, for charger malfunctions.X315
  36. 36AC voltage sensing boards that monitor the 3 phase input voltage to the chargerX307, 308, & 309
  37. 37The DC sense boards that monitor the DC output voltage from the chargerX310 & X313, 140VDC & 105VDC respectively
  38. 38What board initiates the turn on of the “Charger Failure” light, as well as sending a signal to the X315 trouble board?X313
  39. 39This is in series with the positive leg of the charger output. All current leaving the charger passes through this device. The current through it causes it to send out a small voltage (millivolts). The voltage is sent to the ammeter which displays the current in amps DC, that the charger is producing.Shunt G301
  40. 40Color of P301 AC Available, and P303 Float lampsgreen
  41. 41Color of P302 Fan Failure, P305 Low AC input voltage, P306 Charger FailureRed
  42. 42Color of P304 EqualizeAmber
  43. 43State the 5 charger alarmsFan Failure
    Low AC Input Voltage
    Charger Failure
    Low DC Output Voltage
    High DC Output Voltage
  44. 44Fan switches (centrifugal)M301, & M302
  45. 45Fan Motor thermostat switchZ301
  46. 46Alarm Contact “Quench Arc” Contacts. They contain an RC network!U
  47. 47Charger troubles typically fall into the following categories:Problem with AC Input Voltage
    Blown Rectifier Fuses
    Defective Control/Relay Boards
  48. 48—

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Grado Medio Electronics Flashcards on Battery Chargers, created by wd4ngi on 24/05/2016.
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wd4ngi
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