East EA990G5, Руководство по обслуживанию

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1. Fault record of UPS: The first on-site information of the fault is very important. According to these
information, the fault point and the cause of the fault can be roughly judged, and the correct solution can be
formulated. Therefore, the first thing for engineers to arrive at the site is to record all the conditions of the power
system, mainly recording the following:
1) The status of the UPS system (panel and monitoring information): the information of each display
interface of the LCD screen when a fault occurs, and the display status of the UPS on the monitoring side;
2) History download: use IServiceTool II software to download and save the running history of the UPS;Or
take pictures page by page of the LCD screen history page.
3) Actual input, output and battery parameters of the UPS system: When a fault occurs, the parameters
displayed on the panel may not the real parameters of the power supply. You can use a multimeter to measure the
actual parameters on the terminals and record them, including: input voltage, output voltage, battery voltage;
4) The position of each switch of the power system;
5) Environmental records: The surrounding environment is also very important to the work of the power
system. After completing the above records, the surrounding working environment should be recorded:
1> How is the ventilation; 2> Ambient temperature; 3> Whether the surrounding installation distance meets
the requirements; 4> Is the surrounding environment bad (such as dust or humidity); 5> How is the input and
output battery wiring? Does the wire diameter meet the requirements? Is the electrical insulation damaged? Are
the terminals loose? 6> The name, type, rated power, etc. of the load (you can consult the customer).
2. Fault type identification: After recording all indications, refer to the following fault information
description table to check the abnormal indicator lights. In most cases, the fault is caused by external reasons of
the UPS, so follow the principle of "outside first and then inside", locate and eliminate external faults according to
the fault information table.
Common external failure reasons:
1> Overload
2>Input, output over, under voltage
3>The mains air switch is disconnected or the mains is abnormal
4> Output short circuit
5>The battery voltage is lower than the low voltage point.
3. If the fault may be reported due to the internal reasons of the power supply, an implementation plan shall
be made according to the fault location. Each key step in the implementation of the plan should be recorded so
that the unresolved problems can be referenced when the plan is re-developed.
4. If the above methods still cannot solve the fault of UPS system, the recorded information will be fed back
to the technical support engineer for coordination and resolution.