Operation0850−1/A1
Winterthur Gas & Diesel Ltd.
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4.9 WECS Critical Failure (WECS Engine Failure)
Failure Text ME crank angle #1+2 fail. (ID 1)
Indication FCM−20 No. LED ID Display
#03 and #04 None 1 1
Cause The two crank angle sensor measurements fail.
Procedure ⇒ Do a check of the crank angle sensor unit and terminal box E96 for damage.
⇒ In the terminal box E96, make sure that the cables and connections are connected correctly
and do not have damage.
⇒ If necessary, repair or replace damaged cables.
⇒ Use a multimeter to do a check of the power supply to the last and last but one FCM−20.
⇒ It there is a power supply, do a check of the SSI-Bus terminating resistors (120 ohm) on plugs
X22 (terminals 51/52 and 53/54) and X23 (terminals 59/60 and 61/62) of FCM-20 #01. Make
sure that the resistors are connected correctly and there is no damage.
⇒ If a failure shows only on one FCM−20, make sure that the cable connections on plugs X22
and X23 are serviceable.
⇒ Start a CAS trend in flexView.
⇒ If necessary, replace a minimum of one two crank angle sensor immediately.
Failure Text ME both CA / TDC high shift (ID 65)
FCM−20 No. LED Failure ID Display
Indication #05 BI1 65 65
Cause The difference between the TDC pick-up (measured angle) and crank angle sensor#1 and
sensor#2 is more than 4_CA. this failure will cause an engine shutdown.
The crank angle sensor or toothed belt has moved.
Procedure ⇒ In flexView, do a check for an incorrect TDC offset adjustment.
⇒ Adjust to get the correct distance of the TDC pick-up to the flywheel tooth (usually 4mm)
⇒ Make sure that the crankshaft has no deformation.
⇒ Do a check of the crank angle sensor drive and the belt for damage.
⇒ Make sure the the CAS#1 and CAS#2 are in the correct position (at TDC#1)
⇒ Start a CAS trend in flexView.
⇒ If necessary, replace a minimum of one of the two crank angle sensors immediately
Failure Text ME excessive engine speed (ID 69)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 None 69 69
Cause The engine has too much speed (more than 115% nominal speed).
Procedure ⇒ Do a check of each alarm from the CA sensors
⇒ In heavy sea conditions, decrease the engine speed.
⇒ Do a check of related speed alarms in the safety system
2014
Failures and Defects of WECS Components
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