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19/07/2023

Failure of the remote automatic control of the main engine. Actions of the ETO. Kongsberg Troubleshooting

Greetings! In this article, we will consider the actions of the ETO in case of failure of the remote automatic control of the main engine (real situation).

Failure of the remote automatic control of the main engine. Actions of the ETO

The vessel is equipped with the AutoChief C20 Propulsion Control System, which is very often used for fixed-pitch MAN MC engines. Produced by Kongsberg Maritime.

AutoChief C20 Control Panel (ACP)
AutoChief C20 Control Panel (ACP)

The situation with the failure of the remote automatic control occurred in a maneuvering mode, the vessel was sailing along the river with a pilot.

ACP limits
ACP limits

After the actions of the chief officer when disabling the limits and changing the speed (the exact information is not known exactly what actions were taken), the main engine remote automatic control failed and the ship became uncontrollable in terms of speed.

Propulsion plant
Propulsion plant

The telegraph control panel on the bridge was full of errors and there was no access to the information on the main screen. At the same time, the main engine worked and kept the revolutions preset before the error.

In the engine room ECR, also on the main computer AMS, a lot of system failure errors were displayed on the bridge. The machine telegraph gave errors, but remained in working order, unlike the telegraph on the bridge.

Alarm monitoring system in the ECR
Alarm monitoring system in the ECR
AutoChief Errors (ACP)
AutoChief Errors (ACP)
AutoChief Errors (ACP)

Actions of the ETO

In this situation, the only thing that comes to mind is to restart the telegraph on the bridge. In this case, you first need to give control to the engine room (ECR), after setting the desired number of revolutions of the main engine.

After pressing the corresponding buttons (ECR) and confirming the operation, the control of the main engine was transferred to the ER.

As usual, in such situation there is not enough time for thinking and should to act with radical methods. Therefore, on the telegraph of the bridge, it was necessary to take out the supply terminal and thereby de-energize the unit and reboot it.

Reboot ACP
Reboot ACP

After the reboot, control was transferred to the bridge and the normal operation of the remote automatic control of the main engine was restored.

Remote automatic control of the main engine (drawing)
Remote automatic control of the main engine (drawing)

In the future, the drawing was investigated and work on the mistakes was done. In this case, it was necessary to go to the UPS cabinet of the main engine, where the main breakers and backup batteries are located. Select the desired breakers, according to the drawing presented above and restart the telegraph.

Breaker F1A
Breaker F1A
Breaker F1B
Breaker F1B

Unfortunately, this method of reloading would affect all the components of the main engine automation on the bridge and it is not known how safe it would be.

In this situation, a simple reboot helped, but not with simple actions. From this article we can conclude that when getting on a new vessel, it is very important for ETO to study the circuits and ask yourself a question "how to properly reset (restart) different control systems on a vessel".

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