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Wednesday, 30 August 2017

Crow Bar


  • It is an Electrical Safety Device to Protect Electronic Equipments in TCC from Over Voltage
  • If DCL voltage exceeds 3000 V, Soft Crow Bar action is taken by LCC
  • If DCL Voltage exceeds 3400 V, Hard Crow Bar action is taken by LCC
  •  


Soft Crow Bar
  • LCC itself Rectifies this Trouble, by Controlling Excitation
  • Surge voltage is diverted through resistor
  • Most of the time it is reset when TH is moved to Idle
  • If any message is displayed, can try with TCC recycling


Hard Crow Bar
  • Whenever hard crow bar acts, GFC will open and very low resistance will be connected  between positive & Negative
  • LCC will Cut off full Power. TE Meter will indicate Zero; heavy oscillation from Truck will be Experienced
  • DID will give a message with Alarm
  •           “No Load”
  •           “Communication Failure “        
  •           “Hard Crow Bar Fired – TCC 1 / 2”
  • Recycle both TCCs after securing C/stand


Medha Loco
Additionally Brake chopper is provided – acts at 2800 V

If hard crow bar acts, Message is displayed to Shut down & Re Crank Engine

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