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62 Chapter 9 Service & Maintenance
HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual
Chapter 9 Service & Maintenance
Regular service and maintenance are required during the long term operation of the UPS system (including the
associated battery). The battery maintenance is expounded in chapter 6. This chapter deals with the life
characteristics of the key components of the UPS, and provides recommendation for the regular check and service of
the key components. Proper service and maintenance of the UPS system can extend the UPS life and reduce the risk
of system malfunction.
9.1 Safety
Warning
The daily patrol check of the UPS system can be conducted by trained personnel, while the check and replacement of the UPS
components should be done by authorized professionals.
9.2 UPS Key Components And Their Lives
During the UPS operation, some UPS components’ lives are shorter than the UPS life due to wear and tear in
working. To ensure the safe power supply of the UPS system, regular check and replacement of these components
are required. This section introduces the key components of the HIPULSE U series UPS and their reference working
lives. For systems working in different conditions (environment, load, and so on), you may ask professionals to
assess the components and provide advices whether to replace the components by referring to the information
provided in this section.
9.2.1 Magnetic Components: Transformer, Inductor
The design life of the magnetic components is 20 years. The key factors affecting the life of the magnetic components
are the interwinding isolation system and the temperature increase in operation. The HIPULSE U series UPS adopts
H-level isolation system and can withstand up to 220°C working temperature. Normally, the UPS works in forced air
cooling condition.
9.2.2 Power Semiconductor Devices
The power semiconductor devices include SCR (silicon-controlled rectifier) and IGBT (insulated gate bipolar
transistor). In normal UPS working condition, there is no rated life of the power semiconductor devices. The SCR and
IGBT failures are always caused by other problems, as they do not have the problem of life expiration. However, in
system service and maintenance, you should check on an annual basis the appearances of the power semiconductor
devices for erosion and damage. If you spot any risk of failure , replace the device.
9.2.3 Electrolytic Capacitors
The life of the electrolytic capacitors depend on the DC bus voltage and ambient temperature of the UPS.
To ensure safe and stable UPS operation, it is recommended to check the operation status of the electrolytic
capacitors on an annual basis. The electrolytic capacitors must be replaced before their life expires, advisably, within
5 to 6 years of operation.
9.2.4 AC Capacitors
It is recommended to replace the AC capacitors within 5 to 6 years of continuous operation, and to check the AC
capacitors on a half year basis. Replace the AC capacitor if spotting any deformation.