- 135 -
000907AG
7 - Operation
10. Check the absence of voltage on the DC terminal block using
the VAT
- Check the absence of voltage on the DC terminal block measuring
between “Positive-ground”.
- Check the absence of voltage on the DC terminal block measuring
between “Negative-ground”.
- In case of absence of voltage between “Positive-ground” and
“Negative-ground” check that there is no voltage on the all DC
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the points: +DC input / -DC input.
11. Voltage absence check on AC side
Check there is no voltage on the AC output (GRID) screw terminal
block
43
, measuring between: phase to PE - Neutral to PE - Phase
to Neutral
12. Voltage Absence on DC Bulk Capacitor
Wait the discharge time indicated on the safety label (5 minutes at
least)
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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 V 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
OPERATIONS AT INVERTER LEVEL
AC disconnect – Inverter Side
DC disconnects – Inverter Side (opening and LOTO of DC switches in all power
compartments)
Remove the DC cables from the terminal block
Wait the discharge of the internal capacitor
VOLTAGE ABSENCE TEST
Voltage absence check on DC side
Voltage absence check on AC Side
Voltage absence on bulk capacitors
ISSUE WORK PERMIT
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== ONLY if all checks are POSITIVE ( ) the ACCESS IS ALLOWED =
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