Preventative Battery and UPS Maintenance


The availability of mission-critical activities and UPS and battery Preventive Maintenance are inextricably linked. Previously, the necessity to safeguard the UPS investment drove the need for service. Depending on the load on the equipment, the UPS system might be one of the most expensive items in a data centre. As a result, it makes good financial sense to safeguard your investments by extending the life of your equipment via preventative maintenance. In addition to safeguarding the asset investment, guaranteeing uptime is typically the most critical factor. In many circumstances, the cost of downtime far outweighs the cost of the asset or adequate maintenance.


Scheduled preventive maintenance visits, typically semi-annually or quarterly, guaranteed 4 hour emergency service response times, and specific replacement components are all common features of UPS and battery service contracts. All of these factors contribute to a significant reduction in the mean time between failure and the mean time between failure and repair. Today’s top tier 3rdparty service providers maintain component inventories for all of the major OEMs, including Liebert, MGE, APC, and Powerware.


Greater numbers of equipment, like everything else that can be acquired in bulk, cost less per unit to maintain. Data centre owners with several sites might benefit from partnering with a service provider that has a nationwide presence and in-house field service engineers, as well as the best possible pricing and business continuity through consistent and defined standards.


Annual Maintenance Tasks Suggestions:

Excessive heat is detected using thermal scanning equipment.
Check for correct load distribution among modules.
Calibrate AC, DC, voltage, amperage, and frequency measuring devices.
Check the logic of the UPS switchgear transfer.
If applicable, practise using the UPS circuit breakers and contractors.
Verify the rectifiers electrically. Voltage float, recharge, and equalisation in DC
Verify the rectifiers electrically. DC ripple is within acceptable limits.
Calibrate the control logic in accordance with the operating requirements.
Check and modify the system load share for proper levels.
Static switch gate drive circuits, voltage redundancy transfer, and transfer levels should all be electrically verified.
Check the mechanical and electrical connections for torque.
Verify operational integrity, transmit data, and deplete the battery.
Carry out and double-check proper UPS system input failure activities (if approved by customer)
Semi-Annual Maintenance Tasks Suggestions:

Inspect the windings, winding insulators, core laminations, and mounting hardware of important magnetics for evidence of excessive heat or degradation.
Check the operations of the principal magnetic 1st and 2nd stage temperature alarms.
Inspect the rectifier primary power assembly visually and electronically.
Inspect the key power assemblies of inverters visually and electronically.
Measure and record the amperage and capacitance of the AC input filter bank.
Measure and record the amperage and capacitance of the AC output filter bank.
Inspect the logic main assemblies visually and electrically.
Control logic power supply potentials should be electrically verified.
Verify crucial logic control and power signals electrically.
Verify that essential power output waveforms are within specifications electrically.
Inspect power and control wires for evidence of breakage, deteriorated insulation, and high heat or arcing.
Check the lugs and connections for power and control.
Examine the components of the UPS switchgear for evidence of damage.
Examine the circuit breakers and contactors on the UPS switchgear (exercise if applicable)
Verify the potentials of the UPS switchgear logic power supply electrically.
Inspect the power and control wire of the UPS switchgear for damage, worn insulation, and symptoms of high heat or arcing.
Quarterly Maintenance Tasks Suggestions:

Examine the surroundings and the general state of the room (cleanliness, security, access to equipment)
Check for adequate airflow in and around the apparatus.
Examine the air filters: (if required, replace)
find any unusual noises
Instruments should be inspected and equipment readings should be recorded.
Check to see if the status lights are working.
Check that the alarm and system status indicator lights are indicating the right operating state of the device.
Check for open fuses, swelling, and leakage in the AC input filter capacitors.
Check for open fuses, swelling, and leakage in DC filter capacitors.
Check for open fuses, swelling, and leakage in the AC output filter capacitors.
Examine the DC bleeder resistors.
Check to see whether automatic transfer systems are turned on.
Check that the remote status panel and building management systems are in good working order.
Following these guidelines should ensure that this critical piece of equipment in your data centre performs consistently and reliably.