TC reported BCU fault in between stations. hen BCU fault occured, train speed slowed down to 10 kph.When fault self cleared, train speed resumed to normal. Fau lt recurred intermittently. TC reported BCU fault in between ~~~~~ On TIMS observed car 3615 triggered FC309 BCU Brake Demand PWM Fault
multiple times throughout the day, including 15:12H to 15:31H (reported
time of fault).
- From 15:42H onwards, BCU fault (FC308), BCU Control Pressure Fault
(FC314), BCU BCP Fault Bogie 1 &2 (FC330/331) occured multiple times.
- From ER, around 15:09H to 15:31H, car 3615 BCP was high and
fluctuating even though brakes were released at other cars.
- Train was unable to pick up speed consistently at 15:29H to 15:31H.
Train was able to propel at high speeds in ATPM, based on the report,
with STBS activated.
- Brake pressure at car 3615 dropped to zero at 15:50H while train was
stationary from 15:47H until 15:54H, suggesting that the BIC was
isolated at this time.
- Train was then withdrawn in ATPM to BSD.
> Normalised 3615 BIC and 3615 STBS.
> Replaced faulty BCU at 3615.
> Preventively changed out 3615 CP transmitter
> Preventively swapped 3615 ACU (1447-021) to 3616 ACU (1447-024)
> Brake cyclic test satis, brakes able to apply/release.
> Checked brake frame no abnormalities.
> Brake shoes and wheel condition checked ok. Dump valve check ok.
> Limited movement and depot shunting powering and braking ok.