Preventive maintenance of UPS and batteries


There is a direct correlation between maximizing the availability of critical operations and preventive maintenance of UPSs and batteries. Previously, the demand for maintenance was driven by the need to protect the UPS investment. The cost of the UPS system can be one of the largest expenses in a data center, depending on equipment usage. Therefore, protecting the investment by extending the life of the equipment through preventive maintenance makes good business sense. In addition to protecting the investment in the equipment, ensuring uptime is often the most important thing. In many cases, the cost of downtime is many times greater than the cost of equipment or proper maintenance.


Typical UPS and battery service contracts include scheduled preventive maintenance every six months or quarter, a guaranteed 4-hour emergency service response time, and special replacement parts. All of this results in a dramatic reduction in the average time between failure and repair. Today, best-in-class third-party service providers service all major OEMs, Liebert, MGE, APC, and Powerware, and maintain a spare parts inventory for fast repairs. Visit also: UPS Maintenance contract in Pakistan


As with other products that can be purchased in bulk, the cost to service large volumes of equipment is lower on a per-unit basis. Partnering with a service company with nationwide offices and in-house technicians on-site ensures data center owners across multiple locations enjoy optimal pricing and business continuity through consistent and defined standards.


Suggested annual maintenance tasks:

– Checking equipment for excessive heat

– Checking for proper load sharing between modules

– Calibrate AC, DC, voltage, current, and frequency measurements

– Test the switching logic of the UPS switchgear.

– Test the operation of the UPS circuit breakers and, if applicable, the contractors.

– Electrically check the DC rectifiers, charging, and voltage balancing.

– Electrically check that the DC ripple of the rectifier is within the parameters

– Calibrate control logic according to operating specifications

– Check and adjust load distribution in the system to the correct values

– Electrical check of static switch gate drive circuits, voltage redundancy transfers and data transfer levels

– Check tightening torque of mechanical and electrical connections

– Verify proper operation, transmission, and battery discharge

– Perform and verify correct UPS system input troubleshooting operations (if approved by customer).

Suggested maintenance tasks every two years:

– Inspect main solenoids for signs of excessive heat or wear on windings, winding insulators, core plates, and fasteners.

– Check the function of overheat alarms on 1st and 2nd main magnet stage.

– Visual and electrical inspection of rectifier main current assemblies

– Visual and electrical inspection of inverter main power supply assemblies

– Measurement and recording of AC input filter current and capacitance

– Measurement and recording of current and capacitance of the AC output filter bank

– Visual and Electrical Test of Major Logic Assemblies

– Electrical verification of control logic supply potentials

– Electrical verification of critical control and power logic signals

– and Electrical check of critical power output waveforms within parameters

– Visually inspect power and control cables for damage, worn insulation, and signs of excessive heat or arcing

– Check power and control connections and joints

– Visual inspection of UPS switchgear components for signs of damage

– Visual inspection of the circuit breakers and contactors of the UPS switchgear (exercise if necessary)

– Electrical inspection of the logical supply potentials of the UPS switchgear.

– Visual inspection of the power and control cables of the UPS switchgear for damage, worn insulation and signs of excessive heat or arcing.

Suggested quarterly maintenance tasks:

– Check the environment and general condition of the room (cleanliness, safety, access to equipment).

– Check for proper air movement in and around the unit.

– and Check the air filter: (replace if necessary)

– Detect abnormal noises

– Check the instruments and record the instrument readings.

– Verify that the status indicators are working.

– Verify that the alarm and system status indicators show the correct operating state of the unit.

– Check the AC input filter capacitors for open fuses, blows, and leaks.

– Check DC filter capacitors for open fuses, blown fuses and leaks.

– See the AC output filter capacitors for open fuses, blown fuses and leaks.

– Check DC leakage resistors.

– Check if the automatic switching systems are activated.

– and Check that the remote display panel/building management system is operating properly.

Following these rules should ensure consistent performance and uninterrupted operation of this critical equipment in your data center.

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