UPS Preventive Maintenance and Thermal Inspection Tools for Data Centres Malaysia
An uninterruptible power supply, or UPS, protects critical data-centre equipment when the normal electrical supply becomes unstable or unavailable.
Although a UPS may appear to operate normally, deteriorating batteries, loose terminals, overloaded circuits and cooling problems can gradually reduce its reliability.
A structured UPS preventive maintenance programme supported by suitable testing tools helps Malaysian data-centre teams identify developing problems before backup power is needed during an emergency.
Why Is UPS Preventive Maintenance Important?
A UPS normally remains energised and may carry a significant electrical load continuously.
Without regular inspection, hidden problems may develop in:
Battery connections
Input and output terminals
Circuit breakers
Bypass circuits
Cooling fans
Power modules
Internal ventilation
Cables and insulation
Electrical contacts
Monitoring and alarm systems
If the UPS fails during a power interruption, servers, network equipment and security systems may shut down unexpectedly.
Common UPS Problems
Loose Electrical Connections
A loose connection increases electrical resistance and may generate excessive heat.
Possible signs include:
Localised thermal hotspot
Discoloured terminal
Damaged insulation
Burning smell
Unstable voltage
Abnormal noise
A thermal camera can help locate the abnormal heat pattern before the connection visibly fails.
Battery Deterioration
UPS batteries gradually lose capacity as they age.
Battery deterioration may be accelerated by:
High ambient temperature
Repeated discharge cycles
Poor ventilation
Incorrect charging
Loose or corroded terminals
Manufacturing differences
Uneven conditions within the battery bank
Visual and thermal inspection should be combined with the appropriate battery-testing procedure.
Overloaded UPS Circuits
An overloaded UPS may operate at a higher temperature and provide less backup time than expected.
Maintenance teams should check:
Displayed load percentage
Current readings
Connected equipment
Phase balance
Recent equipment additions
Alarm history
A clamp meter may support current measurement when the work is performed by qualified personnel under approved procedures.
Cooling-Fan Problems
UPS electronics and batteries are sensitive to heat.
Blocked ventilation, worn fans or excessive dust can increase internal temperature and shorten component life.
Listen for:
Unusual fan noise
Intermittent fan operation
Rattling
Excessive vibration
Reduced airflow
A sound level meter may help document changes in operating noise, while a thermal camera helps identify rising surface temperatures.
Essential Tools for UPS Maintenance
Thermal Imaging Camera
A thermal imaging camera helps technicians examine the temperature distribution across UPS components.
Typical inspection areas include:
Input terminals
Output terminals
Battery connections
Bypass connections
Circuit breakers
Power modules
Cable joints
Ventilation openings
Cooling fans
The Noyafa NF-522 Thermal Camera can support routine UPS hotspot detection and general data-centre electrical inspection.
Clamp Meter
A clamp meter measures current without disconnecting the conductor.
Depending on the instrument and application, it may be used to check:
UPS input current
UPS output current
Phase-current differences
Connected load
Battery-related DC current
Cooling-system current
Always confirm whether the clamp meter supports the required AC or DC measurement before use.
Digital Multimeter
A digital multimeter may be used for voltage, resistance, continuity and other electrical checks, depending on the maintenance procedure.
Select an instrument with a suitable safety rating for the electrical environment.
Insulation Resistance Tester
An insulation resistance tester helps assess the condition of electrical insulation.
This test normally requires the equipment or circuit to be safely isolated according to the approved procedure. It should not be performed on connected electronic equipment unless the manufacturer’s instructions specifically permit it.
Temperature and Humidity Meter
UPS performance and battery life can be affected by room conditions.
Measure temperature near:
UPS air intake
UPS air outlet
Battery cabinets
Electrical panels
Areas with restricted ventilation
Do not rely only on the temperature displayed by the room air-conditioning controller.
Temperature Data Logger
A data logger can record environmental conditions continuously and reveal:
Overnight temperature increases
Cooling-system cycling
Weekend temperature changes
Short-duration temperature spikes
Conditions during high electrical load
Temperature changes following maintenance
Historical data is useful when UPS temperature alarms occur intermittently.
Sound Level Meter
A sound meter can support the investigation of unusual noise from:
Cooling fans
Transformers
Electrical components
Nearby air-conditioning equipment
It does not determine the exact cause of the fault, but it provides a measurable reference for comparison.
How to Perform a UPS Preventive Maintenance Inspection
Step 1: Review UPS Status and Records
Check:
Operating mode
Load percentage
Active alarms
Previous fault history
Battery replacement date
Last maintenance date
Previous thermal images
Previous electrical readings
Maintenance records provide important context for current measurements.
Step 2: Conduct a Visual Inspection
Look for:
Dust accumulation
Blocked ventilation
Loose covers
Damaged cables
Corrosion
Battery swelling
Leakage
Discolouration
Signs of overheating
Unusual warning indicators
Do not touch or open restricted areas unless authorised.
Step 3: Check Environmental Conditions
Measure the temperature and humidity around the UPS and battery area.
Compare:
Air-intake temperature
Air-outlet temperature
Room temperature
Conditions near different battery cabinets
Current readings with historical data
Uneven conditions may indicate restricted airflow or insufficient cooling.
Step 4: Perform Thermal Inspection
Scan the UPS while it is operating under a representative load, when permitted by the site procedure.
Compare:
Similar terminals
Comparable cables
Individual phases
Battery connections
Parallel UPS modules
Current images with previous inspection records
A single hot component compared with otherwise similar components should be investigated.
Step 5: Check Electrical Load
Qualified personnel may verify:
Input voltage
Output voltage
Input current
Output current
Phase balance
Load percentage
Bypass condition
Record the UPS load at the time of thermal inspection because temperature normally changes with electrical loading.
Step 6: Inspect the Battery System
Check accessible battery areas for:
Swelling
Leakage
Corrosion
Loose connections
Uneven temperature
Damaged cases
Abnormal smell
Blocked ventilation
Battery testing should follow the UPS and battery manufacturer’s instructions.
Step 7: Check Fans and Ventilation
Confirm that:
Ventilation openings are clear
Cooling fans operate normally
Airflow is not obstructed
Filters are clean
Cabinet temperature is reasonable
No abnormal fan noise is present
Poor cooling can affect both UPS electronics and battery life.
Step 8: Document the Findings
Record:
UPS identification
Inspection date
Operating mode
Electrical load
Ambient temperature and humidity
Thermal images
Electrical readings
Visible defects
Alarm information
Corrective action required
Reinspection date
Understanding UPS Thermal Patterns
Not every warm component is defective. Some components naturally operate at higher temperatures.
Technicians should evaluate:
Difference between similar components
Difference between phases
Equipment load
Ambient temperature
Airflow condition
Manufacturer guidance
Previous inspection results
A trend showing gradual temperature increase may be more important than a single isolated reading.
Common UPS Inspection Mistakes
Avoid:
Inspecting only when an alarm occurs
Ignoring battery-room temperature
Performing thermal inspection without recording load
Comparing unrelated components
Assuming every hotspot has the same cause
Blocking UPS ventilation with stored items
Failing to review previous maintenance records
Testing energised equipment without authorisation
Using electrical instruments with unsuitable safety ratings
Recommended UPS Maintenance Tool Kit
A practical toolkit may include:
Thermal imaging camera
Clamp meter
Digital multimeter
Temperature and humidity meter
Temperature data logger
Insulation resistance tester
Sound level meter
Airflow meter
The correct selection depends on the UPS design, battery system, electrical installation and technician’s authorised scope of work.
Improve UPS Reliability Before an Emergency Occurs
A UPS should not receive attention only when a power failure happens.
Regular visual inspection, temperature monitoring, thermal hotspot detection and electrical measurement help maintenance teams identify loose connections, abnormal loads, cooling problems and battery concerns at an earlier stage.
Combining suitable UPS maintenance tools with consistent records improves the reliability of critical data-centre power systems and supports better preventive-maintenance decisions.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
01 Sep 2026
