Emerson U/300/S/6P, U/300/S/12P, 400KVA Service & Maintenance, UPS Key Components And Their Lives

62 Chapter 9 Service & Maintenance

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.

HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual