Greetings! Low insulation 440V has appeared, but this time it is difficult to detect because insulation appears for a short time and disappears. After two days of observations, it turned out that low insulation comes out twice a day, usually at lunchtime and at night.
We also noticed that when low insulation 440V comes out, the temperature of the meat refrigeration (freezer) chamber goes to INHIB in the alarm monitoring system in the ECR.
Greetings! Today we will analyze the sequence of actions of an electrician when finding the source of low 440V insulation on the vessel. In the previous article we looked at the first actions of the ETO when searching for low insulation 220V, I recommend reading that article first, because it is more detailed. And the search methods are not much different, but there are nuances.
Finding low 440V insulation on a vessel involves tripping the circuit breakers one at a time, starting with the non-critical consumers.
It may happen that the reason for low insulation is immediately known, because a 440V high pressure machine was started on the deck and perhaps it was flooded with water. But it happens that you cannot find the source on the first try.
Greetings! Today our boiler does not start, there is an “Abnormal Fire” signal on the panel, and a “Boiler Total Alarm” on the alarm monitoring system in the ECR. The main switchboard has low insulation 440V, but no alarm.
There can be many reasons for this problem; in this article we will look at some of them. And we will analyze our case in detail.
Today we got low insulation of 440V on the main switchboard megohmmeter when starting the emergency fire pump. Checking the power part of the circuit showed an insulation resistance relative to the electric motor housing of 0 MOhm. Has the motor burned out or is there a chance to restore normal operation of the mechanism?
Checking the power part of the circuit (main contactor and autotransformer) with a portable megohmmeter showed 0 MOhm. Have to climb into the pump shaft and measure the insulation resistance of the electric motor at the terminal box with disconnecting of the power cable.
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.
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