Uninterruptible Power Supply Check

This check is one step in the Pressure Systems and Refrigeration programme, scoped narrowly to protective power on critical systems. Using it to log general electrical maintenance or a one-off outage report produces a record that doesn't answer the question it exists for.

ISO 55001 doesn't mention UPS units by name. It asks that operational controls on critical assets be executed, evidenced and tied back to risk and performance review, which is what turns a battery check into an auditable control rather than a maintenance courtesy.

A UPS review reads differently depending on which instrument a site is answering to, and mixing them up produces a record that satisfies neither.

Filling in every field is mechanical. The four calls below are where two engineers can complete the same form honestly and reach different conclusions about whether the unit is actually protected.

Patterns that show up repeatedly once these records are reviewed as a set rather than one at a time.

A UPS protecting a chiller control panel had passed its self-test every quarter for two years. Battery Age Years had crept past four, but Battery Replacement Due kept getting logged as No because the unit was still reporting healthy and nobody had run a discharge test since installation.

When mains actually dropped during a storm, the unit carried the load for under three minutes against a rated autonomy of twenty. The chiller controls lost power mid-cycle, and the resulting product loss cost more than the batteries would have. The self-test had never been wrong about the electronics; it had simply never been asked the question a discharge test answers.

The form itself is the easy part. Catching the gap between a passed self-test and a real discharge result, and making sure a marginal finding actually produces an action, is the work that slips without something watching the pattern across cycles.

KnowMaintain

Holds the UPS register against every protected asset, flags a unit whose discharge test is overdue, and keeps the replacement-battery decision tied to an actual age figure rather than a status light.

KnowComply

Rolls the quarterly result into the site's ISO 55001 evidence set, so a reviewer can see operational control and corrective action closed out together rather than chasing separate records.

KnowOps

Cross-references protected loads against current site equipment, surfacing the load creep that turns a previously adequate UPS into an undersized one before an outage does it instead.

Ella

Coordinates the crew, rolls completion and exceptions into one view across UPS, generator and business continuity records, and holds every write for your approval before it touches a record.

Autonomy

The length of time, usually in minutes, that a UPS can carry its connected load on battery power alone before output drops. It falls as batteries age even when the unit reports no fault.

Discharge test

A test that runs the UPS on battery for a meaningful period under real or simulated load, revealing degraded capacity that a short self-test cannot detect.

Bypass

A path that routes mains power around the UPS electronics, used during maintenance or when the unit itself needs to be taken offline without dropping the protected load.

Load bank

Equipment used to apply a controlled, adjustable electrical load during a discharge test, so autonomy can be measured against a known figure rather than whatever happens to be plugged in that day.

VRLA battery

Valve-regulated lead-acid battery, the common sealed battery type used in UPS units. It ages predictably with time and temperature but fails without external warning signs until load-tested.