《UPS maintenance》.pdf

TM 5-693 CHAPTER 5 UNINTERRUPTIBLE POWER SUPPLY (UPS) SYSTEMS MAINTENANCE PROCEDURES _______________________________________________________ 5-1. Maintenance for UPS systems A general guide for the maintenance requirements of the UPS systems modules, static switches, and controls is provided. Although electronic components are not subject to wear in the same degree as electromagnetic (EM) components, they do require systematic maintenance. A standard maintenance procedure cannot be developed for all types and sizes of UPS units. The manufacturers users manual should always be consulted as to specific maintenance requirements and troubleshooting diagnostics guidelines. a. Safety. Do not rely on memory. Follow the users manual guidelines. Such guidelines should provide safety precautions. If your users manual limits the maintenance that can be provided by the user, follow the manuals instructions unless general instructions are supplemented with additional guidance. Physical maintenance or troubleshooting should only be performed by personnel trained on the system. Operating personnel not instructed in UPS maintenance must limit their efforts to identifying the symptoms of a fault. Always be aware of the DANGER, as voltages within the UPS modules and associated switchgear are lethal. Lethal voltages are present even when the output circuit breaker in the UPS is open. It is necessary to open the circuit breaker in the distribution panel feeding the UPS and the UPS bypass circuit breaker, plus opening the direct current (dc) link connection to the battery, before all dangerous voltages within the UPS are eliminated. Capacitors may need to be discharged of their stored energy. Use CAUTION when operating UPS equipment to prevent serious injury or death. b. Preventive maintenance.