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Load-based sizing, supply and installation of Uninterruptible Power Supply (UPS) systems — clean, continuous power for servers, workstations and critical equipment through every mains failure, sag or surge.
A UPS (Uninterruptible Power Supply) sits between the mains supply and your equipment, holding a charged battery bank ready to take over the instant grid power fails, sags or spikes — with no perceptible break for connected loads. Beyond backup during outages, a good UPS also filters out voltage fluctuations, surges and frequency noise before they ever reach sensitive electronics.
For an office or corporate building this protects three things at once: data (unsaved work and live database transactions during a sudden cut), hardware (servers, NAS, networking gear and workstations are far more sensitive to dirty power than lighting or motors), and continuity (a graceful, controlled shutdown instead of a hard crash that can corrupt files or damage disks).
An online UPS set is a cabinet of power electronics plus a battery bank. The drawing shows what is inside and how power flows through it; the cards below explain each part and what the Febino Digital team checks on it during service.
Converts incoming mains AC into DC. It feeds the inverter and, at the same time, keeps the battery bank charged so the backup is always ready.
The DC link that joins the rectifier, the battery and the inverter. Capacitors smooth the DC so the inverter gets steady power. When mains fails, the battery takes over on this bus with no break.
Turns DC back into a pure sine-wave AC at 230 / 415 V, 50 Hz. In an online UPS the load always runs from the inverter, so spikes, sags and power cuts on the mains never reach it.
A string of batteries in a rack or cabinet that powers the load when mains fails — until the DG starts or for the backup time you choose (typically 10–30 minutes, or more). Battery health decides whether the UPS actually holds up.
If the inverter overloads or develops a fault, this electronic switch transfers the load straight to mains in a few milliseconds, so the load keeps running. It switches back when the inverter is healthy.
A manual switch that routes the load around the whole UPS, so engineers can service or replace the UPS without shutting down the connected equipment.
Breakers and terminals where the mains cable comes in and the load cable goes out, plus a DC breaker for the battery. They protect the cables and let each part be isolated safely.
Shows load, battery level, backup time, input / output values and alarms. A network (SNMP) card lets the UPS send alerts by email and shut down servers safely, and link to the BMS.
Power electronics make heat. Fans pull air through the cabinet to keep the rectifier and inverter cool — a blocked filter or failed fan is a common cause of UPS faults.
Undersizing a UPS causes nuisance shutdowns under load; oversizing wastes capital and floor space. We size to your actual load, not a fixed catalogue number.
Mains present — rectifier powers the load and charges the battery via the BCB. Mains failed — battery powers the load via the BCB and inverter, with zero switchover time. Maintenance mode — mains feeds the load directly through the Q2 maintenance switch, rejoining before the Q4 output switch, so the rectifier and inverter can be serviced with the load still powered. Bypass active — mains feeds the load directly through the Q3 bypass switch, skipping the rectifier, inverter and Q4 entirely, and rejoining after Q4, typically during a UPS fault or overload.
Online double-conversion UPS with runtime sized for a safe, automated shutdown or generator changeover.
Line-interactive UPS units protecting desktops, switches and routers from sags, surges and short outages.
Dedicated UPS backup for fire alarm panels, access control and CCTV recorders so life-safety and security systems stay live through a power cut.
UPS capacity (in VA or kVA) is calculated from the total connected load of equipment you need to protect — workstations, servers, networking gear, lighting circuits — plus a safety margin of roughly 20-25% for future load growth, and the runtime you need at full load. Febino Digital carries out a load audit and battery-backup calculation before recommending capacity, rather than selling a fixed size.
An Offline (standby) UPS switches to battery only when mains fails, with a few milliseconds of switchover time — suitable for basic desktop protection. A Line-Interactive UPS adds automatic voltage regulation to correct minor sags/surges without switching to battery, suiting small office and retail loads. An Online (double-conversion) UPS continuously converts AC to DC to AC, giving pure, regulated output with zero switchover time — the standard for servers, data centres and critical corporate loads.
Backup runtime depends on battery bank capacity (Ah) versus the connected load — a higher load drains the battery faster. Standard internal-battery UPS units typically give 10-30 minutes at full load, enough to ride out short outages or trigger a safe shutdown; external battery banks can extend this to several hours for critical loads.
Yes. Febino Digital offers Annual Maintenance Contracts covering battery health checks and load testing, output voltage/waveform verification, capacitor and fan inspection, firmware updates on networked UPS units, and emergency breakdown support.
Speak to a power systems engineer today. Free load assessment and capacity sizing for office and corporate buildings in Kolkata, Howrah, Durgapur, Asansol and across West Bengal.
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