In previous articles we looked at various problems with cargo cranes, this time a PLC failure error occurred and cargo crane does not start.
What to do in such situation and how to restore the operation of the cargo crane will be discussed in this article.
As usual, the first step is to refer to the Troubleshooting manual.
Greetings! Today we got a "Motor Fault" error on the cargo crane and the crane doesn't want to start. In the article we will consider the main actions of ETO when searching for and eliminating this malfunction.
The problem is quite large-scale and it can be anything related primarily to electric drives of both the main and auxiliary mechanisms of the crane. There was also a short-term accompanying signal in the ECR on AMS "low insulation 440V", which further narrowed the circle of my search.
Some problems with cargo cranes that occur on the ship.
Deck crane hoisting limit switches
While checking hoisting limit switches, due to incorrect setting of the hoisting limit switch on deck crane no. 1, noticed that the system differs from the ones on other sister ships. Hoisting up limit switch is no longer activated by means of a small weight that slacks the chain when the hook touches it, thus activating the micro switch, as on the previous sister ships; instead it has been put on the cam limit switch together with lowering limit. This means that the hoisting up limit is no longer fixed, to hook being about 2 meters below the boom head regardless to the boom angle; but that it is activated when the exact amount of wire rope is wound up on the drum.
