Workscope: Motor Starter (Limit-Amp) On-Site Maintenance

• The contactor will be inspected for worn, damaged and missing components
  

  -	Inspection includes, but is not limited to, damaged secondary power connections, bent or damaged interlock arms, cracked frame, bent primary disconnects and missing hardware.
  -	Any item found damaged will be recorded and a suitable replacement identified.

• Phase barriers will be removed and interrupters will be inspected for erosion and damage
  

  -	Barriers will be inspected for cracks and damage.
  -	Interrupter assemblies will be inspected for chipped or broken fins.
  -	Any item found damaged will be recorded and a suitable replacement identified.

• Contacts will be cleaned (as applicable) and inspected for proper wipe and signs of deterioration
  

  -	Contact structures will be cleaned in place and all components inspected, where possible, for damage and wear.
  -	Parts needing silver plating will be quoted separately.

• The frame and mechanism will be cleaned and inspected
  

  -	The contactor frame will be inspected for damage and wear.
  -	The contactor mechanism will be disassembled as necessary to inspect for damage or wear.
  -	All parts will be cleaned and re-assembled.

• The operating mechanism will be lubricated with extended life lubricant
  

  -	Wherever possible, all bearings and sliding surfaces will be lubricated with the appropriate extended life lubrication.

• Mechanical adjustments will be checked and adjusted as required
  

  -	Contact wipe and gap measurements will be taken as required.
  -	Mechanism adjustments will be completed according to manufacturer's specification.

• Interlocks, mechanical and electrical, will be checked and adjusted for proper operation, if necessary
• Electrical accessory devices will be tested for proper operation (if applicable)
• Each contactor will be electrically operated in its respective cubicle via system control power to assure proper operation (If applicable)
  

  -	The contactor will be placed in the test position, and the system control will be used to verify operation.

• Final electrical tests will be performed, as applicable
  

  -	Contact resistance tests - A digital low resistance ohmmeter will be used to record the contact resistance and compare it to the manufacturer's specifications. High resistance in the contact structure can cause excessive heat in the breaker and prematurely dry out the lubrication.
  -	Insulation resistance tests - A 500 to 1,000 volt megger will be used to determine the condition of the circuit breaker insulation to the ground and across phases.
  -	Vacuum integrity test (if applicable) - The vacuum integrity test is used to verify the condition of the vacuum interrupters.
  -	Functional/Operational Tests (electrical and manual) - Control power will be used to operate the contactor and verify correct operation and measurements.

• The switchgear will be cleaned, lubricated and inspected for worn and missing parts
  

  -	The contactor cubicle will be cleaned and inspected for proper operation of the shutter assemblies.
  -	Cubicle components will be lubricated as required.

• Test data will be included as part of the final customer report
  

  -	All test data received will be included with the circuit breaker test report.
  -	A quotation of recommended repairs will be generated and sent to the customer.

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