eecnet.com Contact Details:
Main address: 410 Forest Street F-01752 Marlborough, MA ,
Tel:( 50 8) 22 91 40 0 , Fax:( 50 8) 30 30 57 9 , E-mail: info@eecnet.com
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Scope of Services

Uninterruptible Power Supply (UPS) System

Preventive Maintenance – Scope of Workups-maintenance

Minor PM

Visual Inspection:

  • Inspect overall unit operation
  • Inspect display function
  • Inspect alarm history
  • Inspect cooling fans

Measure, check, record, and adjust if necessary:

  • Input voltages and currents
  • DC voltage and current
  • AC ripple voltage and current
  • Output voltages and currents
  • Breakers
  • Check and replace all filters (as required)

Perform complete thermal scan of all possible electrical connections
Remove all foreign debris from equipment compartments, where applicable
Check and record room ambient temperature and verify proper operation of ventilation equipment

Major PM
– Includes all tasks done during Minor PM visit plus the following:

Visual Inspection:

  • Clean and inspect all logic cards
  • Inspect all connectors
  • Inspect major components
  • Inspect cables and wiring harnesses
  • Verify that all diagnostic tests function properly
  • Verify all protection settings

Measure, check, record, and adjust if necessary:

  • All power supply voltages
  • Check and verify manual transfers from UPS system to normal bypass and from normal bypass to UPS system
  • Check all primary and secondary circuits for proper torque
  • Check all electrical connections for proper torque and general condition
  • Check all system level alarms
  • Check power capacitors for swelling and leaking oil
  • Check and verify automatic transfers
  • Check inverter and rectifier snubbers for burned or broken wires

Documentation of inspection with recommendations for any corrective action deemed necessary will be provided on both Minor and Major PMs

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