UPS Preventive Maintenance Service

UPS Preventive Maintenance Programs -- Critical Systems Services customizes your PM program to exactly meet your needs, from once a year to once a week, CSSI will work to ensure you get the most value from your critical power equipment and our service program.

I. Internal Operating Parameters

•  Check the Inverter and Rectifier snubbers for burned or broke wires.

•  Check all connections for proper torque and/or discoloration.

•  Check fuses on the DC capacitors deck for continuity (if applicable).

•  With customer approval, perform operational test of the systems including unit transfer and battery discharge.

•  Calibrate and record all electronics to system specifications.

•  Measure and record phase-to-phase input voltages and currents.

•  Review system performance with customer to address any questions and to schedule any repairs.

•  Check air filters for cleanliness, replace as needed.

•  Perform a temperature check on all breakers, connections and associated controls, Repair and/or report all high temperature areas.

•  Perform a complete visual inspection of the equipment including subassemblies, wiring harnesses, contacts, cables, and major components.

•  Check module(s) completely for the following (if applicable).

•  Rectifier and Inverter snubber boards for discoloration.

•  Check power capacitors for swelling or leakage.

•  Check DC Capacitor vent caps that have extruded more than 1/8”.

•  Record all voltage and current meter readings on the module control cabinet or the system control cabinet-input and output phase A, B, & C.

•  Measure and record harmonic trap filter currents. 

Following the Preventive Maintenance Inspections, a written report will be provided detailing the results of the Inspection, and make specific recommendations toward future remedial action, or upgrades.

(Note: Not all items are applicable to all systems and manufacturers.)