13. Check list to be lled prior the access to the inverter
• Purpose of the checklist is to verify that all the operations mentioned
in the procedure have been carried out. The checklist below must
be attached to the intervention report.
CHECK STATUS √ or X
Prepare for the work and identify the work location and equipment
PPE and Equipment Check
PPE wearing
OPERATIONS AT PLANT LEVEL [*]
Check the absence of dangerous voltages on inverter chassis respect ground
Operations in External AC switch
Operations in External DC Switch (If present)
OPERATIONS AT INVERTER LEVEL
Operations on internal DC switches (If present)
Remove the DC quick t connectors from inverter
Wait the discharge of the internal capacitor
Open the cover and visually inspect the components
VOLTAGE ABSENCE TEST
Voltage absence check on DC side
Voltage absence check on AC Side
Voltage absence check on bulk capacitor
ISSUE WORK PERMIT
Issue work permit and “Walk the permit” – Check list lling
== ONLY if all checks are POSITIVE (√) the ACCESS IS ALLOWED =
[*]: Identication of the external switch may require the cooperation of the plant manager and it must be
included in the switching plan dened during the preparation of the work.
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