DC POWER SYSTEM PREVENTIVE MAINTENANCE
- SCOPE OF WORK

  Minor PM  

Visual Inspection:

• Alarms
  
• Power plant components
  
• DC power room
  
• Power cabinets

Measure, check, record, and adjust where necessary:

• AC input voltages
• AC input currents
• DC output voltage
• DC output current
• Load sharing
• Battery float voltage
  

Check and record DC power room ambient temperature and verify proper operation of ventilation equipment 

Verify operation of system ventilation fans and replace fan filters

Remove all foreign debris from all equipment compartments where applicable

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

Measure, check, record, and adjust if necessary:

• Current limiting
• High voltage shutdown adjustments and alarms if possible
• Low voltage shutdown adjustments and alarms if possible
  
  

Verify:

• All diagnostic tests function properly
• Protection settings if possible
  

Check all electrical connections for signs of
heat and general condition.

Perform complete thermal scan of all possible electrical connections.

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