Preventive Maintenance Visits (PMVs) are one of the key services included in an ongoing UPS maintenance plan. It is recommended that a UPS system has a minimum of one PMV every year.
The purpose of a PMV is to provide a detailed inspection of the unit, which helps to identify and rectify any problems. It also enables service engineers to upgrade software and perform system tweaks to optimise operational performance and efficiency.
A PMV incorporates a visual test of the UPS, plus a physical check of all electrical connections. Many UPS maintenance companies now use sophisticated thermal imaging technology that can pick up more faults than the human eye or touch.
Particular attention is paid to circuit breakers, contactors, fuses, cabling, transformers, printed circuit boards, capacitors, fans and communications slots. Batteries are inspected for signs of damage, corrosion or leaks, with all terminal connections checked to ensure they are at the correct torque setting.
Engineers also carry out several mechanical tests on the functionality of the UPS, recording the system’s operating state and vital electrical measurements.
In addition, a PMV includes a download and full review of the UPS performance history logs, as well as ensuring the unit has the latest firmware installed.
The final steps in a Preventive Maintenance Visit for UPS will see the engineer complete the maintenance register, provide a full report of any faults found during the visit, and highlight any recommended remedial actions.
A PMV also acts as a “health check” on UPS systems that are from third-party manufacturers or for units that are outside of warranty and want to be included on a UPS maintenance plan.