Trouble Shooting When Safety Device Tripping In WDG4/WDP4

WDG4/WDP4 Locos

OSTA Tripping

Indications:

  1. During cranking engine will not fire.
  2. During running engine will shut down.

Message in Display:

No start - Mechanical OSTA Tripped, Reset before Start.

Action to be Taken by LP:

Reset OSTA and crank the loco. Message will go off automatically after engine gets hold.

Message in Display in SIEMENS Loco

No Aux. gen. output/check all breakers.

Action to be Taken by LP:

Press EFCO button or recycle computer breaker ad crank the loco.

LLOB Tripping

Indications:

  1. During cranking engine will not CRANK.
  2. During running engine will shut down.

Message in Display:

Engine protection shut down – Low Oil Pressure.

Action to be Taken by LP:

  1. Ascertain the reason, reset LLOB.
  2. Ensure Low Water Button is in normal position then.
  3. Re-crank the loco.


Low Water Button in EPD Tripping

Indications:

  1. During cranking engine gets hold and shut down automatically within 180 seconds.
  2. During running engine will shut down immediately if the engine speed is above third notch.
  3. If engine speed is below third notch engine will shut down automatically within 180 seconds.

Message in Display:

Normally no separate message. When it trips engine lube oil going to the LLOB are drained to lube oil sump, leads to LLOB tripping and message generated for LLOB Trip.

Action to be Taken by LP:

  1. Ascertain the reason, reset LLOB and Low Water Button.
  2. Ensure Low Water Button test COC is in open then re-crank the loco.
  3. If repeats inform shed.

Crankcase button in EPD Tripping

Indications:

  1. During cranking engine gets hold and shut down automatically within 180 seconds.
  2. During running engine will shut down immediately if the engine speed is above third notch.
  3. If engine speed is below third notch will shut down automatically within 180 seconds.

Message in Display:

Normally no separate message. When it trips engine lube oil going to the LLOB are drained, leads LLOB tripping and message generated for LLOB Trip.

Action to be Taken by LP:

  1. Do not crank the loco.
  2. immediately Inform to shed.

Hot Oil Detector Indication

Indications:

  1. It will get operated when engine lube oil temperature reaches above 124oC and engine come to shut down.
  2. It will happen after experience high water temperature and extended time.

Action to be Taken by LP:

  1. Fail the Loco and inform shed.

LWS indication

Indications:

  • It is available in WDP4 locos only.
  • During cranking if this switch operates, then Engine will not crank.
  • While on run, if the water level is dropped below the safety level this switch will operate and 'low water level'. message will come and there will not be any restriction on loco operation.
  • However, if Hot engine is experienced along with LWS operation, then engine will get shut down with the message 'Low Water level'.

Action to be Taken by LP:

Inform shed.

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