Preventive Maintenance Checklist: UPS, ELECTRONIC - Semi-Annual

• Site conducted

• Conducted on

  Date

• Prepared by

• Location

• Work Order Number

(T)ools, (S)afety Equipment and (M)aterials

• Electrician’s toolset

  Yes

  No

  N/A

• Multimeter

  Yes

  No

  N/A

• Infrared test set

  Yes

  No

  N/A

• Relay timing test set

  Yes

  No

  N/A

• Scotchbrite or very fine emery cloth

  Yes

  No

  N/A

• Battery impedance tester

  Yes

  No

  N/A

• Filters

  Yes

  No

  N/A

• Cleaning material and touch up paint

  Yes

  No

  N/A

Safety Guidelines

• High voltage is present inside the uninterruptible power supply cabinet even when disconnected from the power supply. Use caution when working with energized circuits

  Yes

  No

  N/A

• Follow the site safety rules and your supervisor's instructions

  Yes

  No

  N/A

• Schedule the work with the users

  Yes

  No

  N/A

• Review the manufacturer’s procedures

  Yes

  No

  N/A

• Report any problems you find

  Yes

  No

  N/A

• Record the results in the maintenance log

  Yes

  No

  N/A

Maintenance Procedures

• Tag out unit and ensure all circuits are dead

  Yes

  No

  N/A

• Remove covers and look for signs of overheating, cracks, or looseness

  Yes

  No

  N/A

• Inspect contactor/transfer switch contacts. Clean with scotchbrite or very fine emery cloth as required

  Yes

  No

  N/A

• Check batteries and battery connections for leaks, overheating, or corrosion. Clean and tighten as necessary

  Yes

  No

  N/A

• Complete a battery impedance test

  Yes

  No

  N/A

• Clean air intakes. Clean or replace air filters

  Yes

  No

  N/A

• Test undervoltage relay. The relay should operate at 90% (+ or - 2.5%) of rated voltage. Calibrate the guidance. Record the "as left" pickup voltage

  Yes

  No

  N/A

• Test Meters. Meters should operate within + or - 2.5% of scale. Calibrate if needed

  Yes

  No

  N/A

• Test all circuit breakers. Recalibrate trip and close settings as required

  Yes

  No

  N/A

• Replace indicating lamps, etc as needed

  Yes

  No

  N/A

• Perform spot cleaning and touchup painting as needed

  Yes

  No

  N/A

• Remove tags

  Yes

  No

  N/A

• Reconnect unit to load

  Yes

  No

  N/A

• Perform an operational test by simulating a power failure and checking for proper switching. Verify parameters

  Yes

  No

  N/A

• Return the unit to standby mode

  Yes

  No

  N/A

• Record the battery voltage and trickle charge rate

  Yes

  No

  N/A

• Record undervoltage relay as left pick-up

  Yes

  No

  N/A

• Record as found and as left meter readings

  Yes

  No

  N/A

• Record load test parameters

  Yes

  No

  N/A

• Record battery voltage and trickle charge in standby mode

  Yes

  No

  N/A

• Evaluate the battery for replacement

  Yes

  No

  N/A

Maintenance Hours

• How many hours was spent on this work order?