APD Technical Series · 04/30 · Mission critical
Backup Power Verification for Mission-Critical Sites
Backup power is only reliable after the entire source-to-load sequence is proven under realistic conditions.
The engineering point
Engineering decisions made early prevent expensive field problems later.
What you'll take away
Test the sequence
Verify sensing, start, transfer, load acceptance, retransfer, and cool-down.
Test under load
Confirm the generator, ATS, UPS, and downstream distribution behave together.
Document the baseline
Capture settings, timing, alarms, and results so future changes are measurable.
Built for
- Mission Critical Facilities
- Commissioning Teams
Go deeper
Main-Tie-Main Systems: Design and Automatic Transfer Logic
A main-tie-main lineup splits the bus so that two sources each carry part of the load and either can pick up the whole load when the other is lost. The value is in the automatic transfer logic, and this article explains how source loss is detected, how the transfer is sequenced, and which interlocks keep the scheme from doing harm.
Read the engineering articleMore in the series
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