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Led # 5Feedback signal missing one lubricator

Led # 1 BCU internal failure

An internal failure in the BCU is detected. Check that the small switch SW3 on the BCU board is in the normal position.

Reboot the BCU computer by interrupting the power supply for 5 sec. (Plug FJ 1).

DO NOT PRESS THE RESET BUTTON on the BCU unit.

Led # 2 Engine stop signal failure

The engine stop signal has been on for more than 20 minutes with the engine running. The engine stop signal is off and the engine is not running (only for 30 seconds). Check the stop signal wiring and the engine control system for correct operation.

 

Led # 3 MCU alive signal missing

The BCU unit has detected that the MCU unit is abnormal. The BCU is still full operational in this condition.

Start checking if there are other alarms from the system. Power failure from the MCU will give this alarm as well as a common alarm.

Normally this situation will give a BCU take over.

Check the wiring in MCU plug J52 terminal 2 and 3 and BCU plug J7 terminal 1 and 2 (MCU alive signal connections).

The alive signal is a pulse signal with a frequency of approx. 0,5 Hz. An oscilloscope must be used to measure this signal.

If no problems, as described above, are found try to switch off power to the

MCU unit for 5 sec. If the problem is still present the MCU unit is probably damaged

and must be replaced. However, the engine can be operated in BCU mode until a new MCU unit can be obtained.

 

Led # 4 Feedback signal missing on two lubricators

If, for any reason, a feedback signal from a lubricator is measured as abnormal by the BCU, an alarm will be given (BCU fail alarm).

Note that if the system is running in BCU mode due to a MCU failure, the MCU might not be able to show any alarm codes in the HMI panel. The defect lubricators are to be found by observing the feedback signal indicator lights at the intermediate boxes at the engine.

This alarm indicates that the lubrication is stopped on a cylinder. A slow-down command will be released.

First check if the fault is concerning more than one cylinder. If more than one cylinder is affected, check the oil supply system. The oil pressure might be low or the oil supply from the gravity tank has stopped. Check for leaks on the oil supply lines.

If the problem can be isolated to only one cylinder, check the feedback wiring from the defect cylinders intermediate box to the control box (ALCU). The intermediate box itself might be damaged.

To check if the BCU board is damaged, the plug for the defect cylinder can be removed from the BCU and a plug from a working cylinder can temporally be mounted instead. If this cylinder that previously worked well is now faulty, the BCU board is probably damaged. Remember to remount the plugs in the correct sockets.

The BCU computer can be rebooted by interrupting the main power supply for

Sec. (Remove plug FJ1 on the BCU filter board). Not by RESET button!!!

 

Led # 5Feedback signal missing one lubricator



If, for any reason, a feedback signal from a lubricator is measured as abnormal by the BCU, an alarm will be given (BCU fail alarm).

Note that if the system is running in BCU mode due to a MCU failure, the MCU might not be able to show any alarm codes on the HMI panel. The defective lubricators are to be found by observing the feedback signal indicator lights at the intermediate boxes on the engine .


Date: 2016-03-03; view: 1000


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