Service / Critical Power Maintenance
Three Phase UPSMaintenance Australia
Direct answer
Three phase UPS systems should be serviced at least twice a year, with quarterly visits and battery string testing for mission critical sites. A three phase unit contains wear components with defined service lives, cooling fans at five to seven years and electrolytic capacitors at seven to ten, and the whole system has a useful life of roughly ten to twelve years. Maintenance on a system this size is as much about replacing those parts on schedule as it is about inspection.
Indigi Power and Cooling services three phase UPS systems from 10kVA to multi-megawatt across Australia, standalone, parallel redundant and modular, from $720 ex GST metro. Call 1800 046 344.
The core difference
Wear parts havea service life
The useful thing to understand about a three phase UPS is that it is not one machine that either works or does not. It is an assembly of components with individually predictable lifespans, and maintenance at this size is largely the discipline of replacing them before they take the system with them.
Cooling fans are the shortest lived. They run continuously from the day of commissioning and typically need replacing at five to seven years, sooner in a warm or dusty plant room. A fan that has slowed rather than stopped is the dangerous case, because the unit keeps running while its internal temperature climbs, which then shortens the life of everything else inside it.
Electrolytic capacitors on the DC bus and output filter are next, with a design life of roughly seven to ten years. They degrade gradually and invisibly, losing capacitance until ripple current rises and the unit either derates or trips. Replacing a capacitor bank on a planned visit is routine work; having one fail in service on a loaded system is not.
Across the whole system, ten to twelve years is the point at which the economics usually turn, and parts availability starts to become the constraint rather than condition. Knowing where a unit sits on that curve is the difference between a capital plan and an emergency.
Indigi Power and Cooling is Indigenous and Veteran-owned, Supply Nation and ICN Gateway registered. We are vendor agnostic, and every visit ends with a written report recording measured values against previous visits rather than a tick sheet.
Scale changes the job
Single phaseor three phase service
Single
phase
- Annual service is usually adequate
- One battery string, often internal to the unit
- Batteries are the dominant failure mode
- Parts replaced reactively when they fail
- A visit is measured in hours
- Comms rooms, practices, small server rooms
Three
phase
- Twice yearly minimum, quarterly for critical sites
- Multiple battery strings tested individually
- Fans and capacitors replaced on a schedule
- Load sharing verified across parallel modules
- Thermographic scan of terminations under load
- Data halls, hospitals, industrial plant, infrastructure
The checklist
What a three phase service covers
This is the checklist we work to, published in full. Use it to compare quotes, or hand it to whoever currently services your system and ask which of these they measure and record. The distinction that matters is between checks that are inspected and checks that produce a number written on the report.
| Area | What is checked and recorded | Frequency |
|---|---|---|
| System diagnostics | Event and alarm history downloaded and reviewed, operating mode confirmed, previous visit's recommendations closed out. Intermittent faults that self cleared are the most useful entries in the log | Every visit |
| Electrical input | Input voltage and frequency on all three phases, phase balance, power factor, and the count of transfers to battery since the last visit. Frequent transfers point at the supply, not the unit | Every visit |
| Electrical output | Output voltage and frequency per phase, load per phase, total load as a percentage of rating, and output waveform. Phase imbalance on the output is a common and correctable inefficiency | Every visit |
| Battery strings | Per block voltage across every string, internal impedance trended against previous visits, string and ambient temperature, ripple current, and visual inspection for swelling, corrosion and leakage | Every visit, or annually on non-critical sites |
| Power modules | Module status and fault history, load sharing verified between modules, hot swap mechanism and locking checked, and redundancy confirmed by calculation against the measured load | Every visit, modular and parallel systems |
| Capacitors | DC bus and AC output capacitor condition, visual inspection for bulging and venting, manufacture date recorded and remaining life assessed against a seven to ten year design life | Every visit, replaced on schedule |
| Cooling and thermal | Fan operation and current draw, airflow verified, filters checked or replaced, internal temperature logged, and a thermographic scan of terminations and busbars under load | Every visit |
| Connections and torque | Terminations checked for discolouration and torque verified to specification on power connections. Loose or hot joints are the most common cause of avoidable failures at this size | Annually |
| Bypass and switchgear | Static bypass tested by forcing a transfer, maintenance bypass operation confirmed, and interlocks and labelling checked so the sequence is safe for the next person | Annually |
| Controls and firmware | Firmware revision against current, settings reviewed against how the site actually runs, and calibration of metering verified against an external reference | Annually |
| Alarms and monitoring | Network card status, alarm points tested by forcing the condition rather than assuming, notification routing confirmed to a person who still works there, and remote monitoring verified end to end | Every visit |
| Capacity verification | Load bank test at design load where the site permits, and battery autonomy discharge measured rather than calculated. The only number worth quoting to a board is a measured runtime | Annually, or at commissioning and major change |
| Reporting | Written report with all measured values, trended against previous visits, plus a parts and battery replacement forecast with expected dates for capital planning | Every visit |
If you want this as a document for a tender or an internal audit, ask and we will send it. The learning centre holds our other guides and downloads.
From site
A battery string being built out on one of our jobs. A string is a series chain, so its capacity is set by its weakest block rather than by its average. That is why we measure every block individually instead of reading the string total, and why a bank that looks healthy overall can still contain one cell that will collapse the moment the load transfers.
The interconnect leads matter as much as the blocks. Every link and every terminal sits in series with the whole string, so a loose or corroded connection adds resistance to the entire circuit and generates heat exactly where you least want it. Torque gets checked and recorded, not eyeballed.
Commercial
Maintenance plans and pricing
Australian rates, ex GST, metro. Multi-module frames, parallel systems and multi-site fleets are quoted individually, with the per-unit rate falling as fleet size increases. Regional and remote sites attract a mobilisation charge.
Full inspection against the checklist above with a written report. The right starting point where a system has been inherited or its service history is unknown.
Scheduled visits every six to twelve months with operational load testing, calibration, firmware checks, priority fault response and an annual compliance report.
Quarterly or custom scheduling, 24/7 emergency response to an agreed SLA, remote monitoring, battery health trending, discounted parts and a dedicated account manager.
Batteries, capacitor and fan replacement, load bank hire and any switchgear work are quoted separately. Compare the full range on our UPS maintenance plans page.
Lifecycle
When each part is due
Indicative service lives for a three phase system in an Australian commercial plant room. Heat is the accelerator on all of them, so a hot or poorly ventilated room moves every figure to the shorter end.
| Component | Typical service life | What to do about it |
|---|---|---|
| Cooling fans | 5 to 7 years | Replace on schedule rather than on failure. A slowing fan raises internal temperature and shortens capacitor and battery life before it ever raises an alarm |
| Valve regulated lead acid batteries | 3 to 5 years | Impedance trended at every visit. Life roughly halves for every 10 degrees Celsius of sustained ambient above 25, so Queensland and Northern Territory sites plan on the shorter end |
| Lithium ion batteries | 8 to 10 years | Longer life and far better heat tolerance, monitored through the battery management system. Worth costing at replacement time rather than defaulting to lead acid |
| Electrolytic capacitors | 7 to 10 years | Replace as a bank on a planned visit. Degradation is gradual and invisible until ripple current rises and the unit derates or trips |
| Air filters | 6 to 12 months | Checked every visit and replaced as needed. Dusty industrial plant rooms need the shorter interval, and a blocked filter is a thermal problem, not a cleanliness one |
| Whole system | 10 to 12 years | Lifecycle review, where the question becomes continued servicing against replacement. Parts availability and support status usually decide it before condition does |
Frequency
Recommendedservice schedule
Twice yearly is the floor for a three phase system. Quarterly is the standard for anything genuinely mission critical.
| Activity | Frequency |
|---|---|
| Visual system inspection | Every 6 months |
| Preventative maintenance service | Every 6 months, quarterly for mission critical sites |
| Battery string testing | Annually, or every 6 months for critical sites |
| Monitoring and alarm system review | Every 6 months |
| Torque and thermographic checks | Annually |
| Battery replacement planning | Every 3 to 5 years for VRLA |
| Capacitor and fan replacement | Per the lifecycle table above |
| System lifecycle assessment | Every 5 to 7 years |
Sites in Queensland, the Northern Territory and northern Western Australia should treat the shorter interval as the default on anything temperature sensitive, particularly battery testing and filter replacement.
Warning signs
Call beforethe next visit
Any of these is worth acting on ahead of the scheduled service.
- Transfers to bypass, even brief ones that cleared themselves
- Fan noise that has changed in pitch or volume
- Any module reporting a fault, including one that cleared on restart
- Rising internal temperature reported by the unit or the BMS
- Battery alarms, or a runtime estimate that has quietly dropped
- Load that has grown since the system was commissioned, eroding redundancy
- Capacitors or fans past the service lives in the table above
- No load bank test or measured autonomy figure in the last twelve months
The last two are the ones sites most often overlook, because nothing on the display is complaining. A system can be simultaneously alarm free and well past the point where its wear parts should have been renewed.
Where they are
Facilities we service
Coverage
Techniciansacross Australia
Brisbane and QLD
Brisbane CBD, Tingalpa, Woolloongabba, Eight Mile Plains, Port of Brisbane, Gold Coast, Ipswich, Townsville, Cairns
Our HQ. Government, health and industrial three phase fleets, with heat driving the shorter battery interval.
Sydney and NSW
Sydney CBD, Parramatta, North Ryde, Macquarie Park, Western Sydney, Alexandria, Newcastle, Wollongong
The largest concentration of data halls in Australia. We work to site induction, permit and change control requirements.
Melbourne and VIC
Melbourne CBD, Port Melbourne, Docklands, Dandenong, Tullamarine, Geelong, Ballarat, regional Victoria
Hospital and manufacturing plant rooms, including out of hours windows for load bank testing.
Perth and WA
Perth CBD, Fremantle, Kewdale, Kalgoorlie, Pilbara, regional WA
Resources and government sites, with visits planned around mobilisation windows and site access.
Canberra and ACT
Canberra CBD, Civic, Fyshwick, Mitchell, Barton, Tuggeranong, Belconnen, Queanbeyan
Government data halls, with Supply Nation and ICN Gateway registration for Commonwealth procurement.
SA, NT and Tasmania
Adelaide, Port Adelaide, Edinburgh, Whyalla, Darwin, Palmerston, Katherine, Alice Springs, Hobart
Defence and resources work, with scheduled visits combined across nearby sites in one mobilisation.
Questions
Three phasemaintenance FAQs
What facilities teams and consultants ask before engaging us. If yours is not here, call 1800 046 344.
How often should a three phase UPS be serviced?
Three phase UPS systems should be serviced at least twice a year, with quarterly visits and battery string testing for mission critical sites. That is more frequent than a single phase unit because there is more to check and more that wears: multiple battery strings, cooling fans, capacitor banks, power modules and switchgear. Visual inspection and monitoring review belong on the six month cycle, while torque checks, thermographic scanning and firmware review sit on the annual one.
What is included in three phase UPS maintenance?
Our service works to a published checklist covering system diagnostics, electrical input and output verification per phase, battery string testing with impedance trending, power module and load sharing verification, capacitor condition and age assessment, cooling and thermal checks including a thermographic scan under load, connection torque verification, static and maintenance bypass testing, controls and firmware review, alarm and monitoring verification, and capacity verification by load bank where the site permits. Every visit ends with a written report of measured values trended against previous visits.
How much does three phase UPS maintenance cost in Australia?
Indigi Power and Cooling charges from $720 ex GST metro for a one-off service including the full checklist and a written report, and from $1,940 per year ex GST for a standard plan with scheduled visits every six to twelve months, operational load testing, calibration, priority fault response and an annual compliance report. A critical care plan with quarterly scheduling, a 24/7 response SLA and remote monitoring is quoted after consultation. Batteries, capacitor and fan replacement, load bank hire and switchgear work are quoted separately. Multi-module and multi-site fleets are priced individually.
How long do the parts inside a three phase UPS last?
Cooling fans typically last five to seven years, electrolytic capacitors seven to ten, valve regulated lead acid batteries three to five, and lithium ion batteries eight to ten. The system as a whole usually reaches its lifecycle decision point at ten to twelve years, where parts availability and support status matter more than condition. Heat accelerates every one of these figures, so a warm or poorly ventilated plant room should plan on the shorter end of each range.
What happens if a three phase UPS is not maintained?
The usual sequence is that a cooling fan slows without alarming, internal temperature rises, and that heat shortens the life of the capacitors and the battery strings at the same time. Meanwhile battery impedance climbs unmeasured. Nothing appears wrong until the supply drops, at which point the batteries deliver a fraction of their rated runtime, or a degraded capacitor bank causes the unit to derate or trip under transfer. The failure is rarely sudden in reality, only in appearance.
Can you maintain modular and parallel redundant systems?
Yes, and they need it more rather than less. On a modular frame we verify load sharing between modules, check the hot swap mechanism and locking, and confirm redundancy by calculation against the measured load rather than trusting the label. An N plus one frame that has grown to 85 per cent of total capacity is no longer N plus one, and load creep is the usual way sites lose their redundancy without anyone noticing. On parallel systems we also verify the tie cabinet and that the system rides through a single module failure.
Can a three phase UPS be serviced without dropping the load?
Where a maintenance bypass exists, yes. The load transfers onto the wrap-around bypass and the UPS is fully isolated for work. This is not the same as the internal static bypass, which keeps the unit energised and cannot be used to work on it safely. On modular systems, individual power modules can often be replaced live without any bypass at all. Where no maintenance bypass was installed, we schedule the transfer out of hours and will usually recommend retrofitting one, because its absence is what causes maintenance to be deferred year after year.
What brands of three phase UPS do you maintain?
Eaton 93E, 93PM, 9395 and Power Xpert modular systems; APC by Schneider Galaxy VS, VL and VM plus Symmetra; Vertiv Liebert APM, EXM, EXS and the data centre facility range; Socomec MASTERYS and MODULYS modular systems; and PowerShield Centurion and modular three phase platforms. We are vendor agnostic and service legacy and discontinued frames as well, subject to parts availability, which we confirm before booking rather than after.
Do you provide a maintenance report for audits and tenders?
Yes. Every visit produces a written report with the measured values rather than a tick sheet, trended against previous visits so decline is visible, plus a parts and battery replacement forecast with expected dates for capital planning. Standard plans include an annual compliance report. If you need our full checklist as a document for a tender submission or an internal audit, ask and we will send it.
Related services
Equipment
Three phasebrands we maintain
We are vendor agnostic and hold accounts across all of these, so we service what you already own. Legacy and discontinued frames are no obstacle, but we confirm parts availability before booking rather than discovering it on site.
Inherited a system with no service history? That is the most common reason facilities teams call us. Send us the make, model, capacity and rough age and we will tell you what the first visit involves, what we expect to find, and whether parts are still available for it.
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