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Power Electronics Standalone NB 120 - EQUIPMENT STATUSES FOR LOTO PROCEDURES

Power Electronics Standalone NB 120
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NB 120
POWER ELECTRONICS
50
LOTO procedure
Equipment statuses
Before working with the equipment, it is convenient to define two possible statuses.
The absence of voltage must be verified once an equipment has been isolated, with the necessary means
and PPE.
In addition, the equipment specific diagrams of the installation should be reviewed.
Even the multimeters have scheduled revisions, it is convenient always to check the multimeter is working
fine before taking any measure, especially to prove dead. This might be damaged and show false values.
Use a commercial proving unit to check it.
Use appropriate equipment for DC power measures.
It is responsibility of the technical personnel to have their tools calibrated and in good conditions.
Always wear the PPE according to electric risk and to the current Health and Safety regulations.
NB 120 STATUSES
STATUS 1
Equipment running (no action required from safe stop).
Proper state for carrying the Power revision.
CHECK POINTS FOR ABSENCE OF VOLTAGE:
No measuring in Status 1.
STATUS 2
The equipment is completely stopped, isolated, discharged and locked.
Follow the complete process from “Loto actions” subsection. Make sure there is no independent auxiliary
supply coming from outside the charger.
Proper state for carrying out the Dead revision.
CHECK POINTS FOR ABSENCE OF VOLTAGE:
Follow the complete process.
CAUTION

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