Provide preventative maintenance, repairs and batter replacement on Liebert 30KVA and Mitsubishi 1100 Series 20KVA. UPS Preventive Maintenance / Annual (include Semi-Annual plus the following): Check the inverter and rectifier snubbers for discoloration or damaged wiring. Check all contacts to ensure secure connections. Verify all connections show no signs of discoloration. Check fuses on the DC capacitor deck for continuity, as applicable. Clean interior and exterior of unit. With RCCD approval, perform operational test of the system including unit transfer and battery discharge. Measure and calibrate, as necessary, where possible, all electronics to system specifications. Measure and record all low-voltage power supply levels. UPS Preventive Maintenance / Semi-Annual Perform a complete visual inspection of all internal sub-assemblies, wiring harnesses, contactors, cables and major components. Check for proper clearance around the unit. Perform temperature checks on all breakers, connections and associated controls. Report all high temperature areas. Check air filters for cleanliness; clean or replace. Check module(s) for the following, as applicable: Rectifier and inverter snubber circuit board discoloration Power capacitors for swelling or leakage Capacitor vent caps extruded more than 1/8” Fans for proper operation Lubricate and check bearings for abnormal condition, as applicable, where possible Record all meter readings and calibrate as necessary, where possible.
