Rule out the battery before condemning the electronics: diagnosing an aged UPS
On an aged unit throwing a fault, the first question is when the batteries were…
Same-week emergency response: removing UPS batteries for a municipal facility
When the fire department required the batteries out before re-occupancy, the priority was safe removal,…
When the Protected Load Changes: Qualifying a 480 V XPC X90 UPS Before Release
An anonymized industrial proposal that was paused when the load scope expanded
Installed Capacity Is Not Frame Capacity: Selecting Modular XPC UPS Architecture
Modular UPS proposals often compress four different values into one word: capacity. A frame may…
Emergency UPS Response Without Guesswork: Mobilizing for a Failed Eaton 9155
When a municipal facility reported a failed Eaton 9155, GDF Technologies dispatched a technician immediately…
APC Smart-UPS Battery, Repair or Replacement: A Defensible Service Decision
An APC Smart-UPS battery indication can point toward a battery replacement, but it does not…
The maintenance bypass, not the UPS, was the real problem
Why a three-phase UPS replacement in a tight equipment room turned on the bypass and…
On-site UPS battery replacement restores verified protection for a Quebec manufacturer
July 12, 2026
On-site UPS battery replacement restores verified protection for a Quebec manufacturer
How a disciplined battery qualification and replacement method returned two aging UPS units to verified…
UPS Preventive Maintenance: Intervals, Checklist and the Standards That Actually Matter
July 10, 2026
UPS Preventive Maintenance: Intervals, Checklist and the Standards That Actually Matter
How often a UPS really needs preventive maintenance, what a standards-based checklist covers (IEC 62040,…
UPS Harmonics and Input Power Factor
June 27, 2026
UPS Harmonics and Input Power Factor
A field guide from the engineers at GDF Technologies, we design, supply, install and maintain…