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Field Testing & Twin SaaS
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#09UPS System Inspection

Project Framework (report reference): IEC 60364-4-41Applicable Standard: IEEE 1188
Module Field Guides, Standard Selection & Tutorials (3)Browse All 93+ Guides →
1 · Field Measurement ProcedureHow to Measure & Test UPS System on Site: Step-by-Step Field Procedure (IEEE 1188)2 · Standards & Limit TablesWhich Standard Applies to UPS System? Acceptance Limits, Annex Tables & Regional Equivalents (IEEE 1188)3 · OhmCert Tutorial & Case StudyHow to Complete a UPS System Certificate in OhmCert: Worked Case Study & Troubleshooting

Multi-Asset / Multi-Point Equipment Schedule

Inspect multiple transformers, panels, rooms, motors, or RCDs in this module without overwriting previous assets. Each item receives a permanent QR Sticker UID preserved across annual audits.

Sticker UID: OC-UPS0-71F9
Plant & SLD (Auto-SLD)

Standard Limits, Equations & Space Presets

IEC 62040-3 VFI-SS-111 (Online Double Conversion) output voltage regulation, THD limits under linear and non-linear reference loads, quarter-cycle static transfer, and IEEE 1188 autonomy verification.

One-Click Normative Presets (Auto-fills Target Limits)

Measured Inputs

Calculated / Evaluated Results

Acceptance: IEC 62040-3 output performance (regulation and THD selected by load type), static transfer inside a quarter cycle, and measured autonomy compared with the design runtime (IEEE 1188 / NETA ATS 7.28).

Pending / Not tested — results stay neutral until valid measured values are entered.

  • Active Output Apparent Power

    -

    For Tier III / Tier IV 2N dual-corded architectures (ANSI/TIA-942), keep each UPS below 45% so a single bus trip stays under 90%.

    Pending

  • Load Level

    - %

    Not tested - enter the measured value. Acceptance: Keep <= 80% to retain redundancy and step-load headroom [ANSI/TIA-942 / IEC 62040-3 practice]

    Pending

  • Autonomy vs Design Runtime

    -

    Not tested - enter the measured value. Acceptance: Measured runtime >= 100% of design; below 90% requires battery replacement planning [IEEE 1188 / NETA ATS 7.28]

    Pending

  • Output Voltage Regulation

    - %

    Not tested - enter the measured value. Acceptance: Steady state output within +/-1% (VFI Class 1) [IEC 62040-3]

    Pending

  • Output Voltage THD

    - %

    Not tested - enter the measured value. Acceptance: THDv <= 2% for linear load [IEC 62040-3 Annex E]

    Pending

  • Static Bypass Transfer Time

    - ms

    Not tested - enter the measured value. Acceptance: Transfer within a quarter cycle (5.00 ms at 50 Hz) so the IT load rides through [IEC 62040-3 / OEM specification]

    Pending

Verification Checklist (0 / 17)

Pending

  • 1UPS double-conversion topology (VFI-SS-111 per IEC 62040-3), firmware revision, and parallel load-sharing config recorded

  • 2Rectifier input, inverter output, and reserve bypass 3-phase voltages and currents within +/-1% steady-state tolerance

  • 3Active load percentage verified <= 80% standalone or <= 45% per bus on 2N dual-corded Tier III/IV architectures [ANSI/TIA-942]

  • 4Inverter-to-Static-Bypass uninterrupted transfer and re-transfer proven within <= 1/4 cycle (4-5 ms) without IT load drop

  • 5Make-before-break Mechanical Maintenance Bypass switch interlock sequence verified and clearly labelled

  • 6Output voltage Total Harmonic Distortion (THDv) verified <= 2% (linear load) or <= 5% (IEC non-linear load)

  • 7DC link float voltage, AC ripple voltage (<= 0.5% RMS), and AC ripple current within IEEE 1188 limits

  • 8Battery circuit breaker (BCB) shunt-trip and undervoltage release mechanism verified functional

  • 9Internal DC link electrolytic capacitors, AC filter capacitors, and cooling fan runtime hours checked against OEM replacement lifecycle

  • 10Air intake dust filters clean and redundant cooling fans operating without bearing noise

  • 11Infrared thermography scan performed on input/output/bypass terminals, contactors, and IGBT heatsinks

  • 12Power cable terminations torque-checked and protective earth (PE) bonding continuity verified

  • 13Backfeed protection contactor / upstream isolation verified to prevent voltage feedback onto de-energised bypass supply [IEC 62040-1]

  • 14Synchronisation tracking window and slew-rate settings verified with upstream generator frequency governor

  • 15SNMP / Modbus / dry-contact BMS alarms (On Battery, On Bypass, Battery Fault, Overload) tested end-to-end

  • 16Emergency Power Off (EPO) contact integration verified (or safely bypassed during live PM with formal permit)

  • 17Measured battery autonomy runtime test compared against design curves and IEEE 1188 >= 90-100% threshold

General Notes

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Free plan: 5 of 5 inspections / calculations left this month.