Case Study #108 | “Maintenance-Free” Batteries
|Product||“Maintenance-Free” VRLA Batteries|
|Application||Business Electrical Room|
|Synopsis||Customer had called for a trouble-shoot and possible shut-down of the UPS|
|Preliminary Actions||The Nationwide Power engineer was on-site to trouble-shoot a UPS unit that was in alarm, and to remove leaking/cracked batteries.|
|Resolution||The UPS was being used to power emergency lighting for 3 buildings and had been running in alarm with batteries shorting to ground for a long time. Upon arrival, the engineer found the UPS with an active rectifier alarm and concluded that the UPS needed new AC and DC capacitors, new fans, and a full battery replacement. The DC link would not return to nominal voltage with batteries being disconnected and the logic was showing other rectifier alarms, signifying potential rectifier issues or logic problems. There were also multiple battery contactor alarms active. The UPS was put into internal maintenance bypass with logic turned off until it can be replaced or repaired. The system may need to be completely replaced.|
|Root Cause||“Maintenance-Free” does not mean that the whole Uninterruptible Power Supply does not need to be maintained. To have maintenance-free batteries simply means that you do not have to add water (as with flooded cell batteries). Some might contend that you do not have to re-torque connections either, however most VRLA battery manufacturer maintenance instructions state they should be re-torqued annually. Regular inspections where voltages and ohmic readings are taken would have electrically identified the battery as trending bad prior to the battery visually indicating the swelling, cracking, and leakage.|
Case Study In this Nationwide Power™ case study, we show the importance of having a qualified Critical Power Professional™ (CPP™) perform maintenance on your critical infrastructure equipment. This case study specifically looks at the Liebert NX 120kVA UPS. A...
Case Study In this Nationwide Power™ Case Study, we show the importance of routine maintenance and its impact on the overall health and life of UPS systems. This case study specifically looks at the Toshiba 1600EP 22kVA UPS. A new customer reached out to our team...
Case Study In this Nationwide Power™ case study, we hope to show our customers another example of how a full-service contract will save our customers time, money, and headaches in both the short term and in the long run. In this case study, we particularly focus in...