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When the device has just been switched off, it may have hot parts as a result of overheating
of the heated surfaces (e.g.: transformers, accumulators, coils, etc.) so be careful where you
touch.
Some inverter parts may be subject to voltages that could be hazardous for the operator.
Before performing any work on the inverter, follow this procedure for safely isolate the inverter.
1. Preliminary checks
• Weather conditions: In the risk assessment prior the intervention it
is of paramount importance to evaluate the weather conditions. This
procedure can be applied only in case of dry environment. Don't
proceed in case of rain (even light) or high humidity.
• PPE Check: Verify the integrity of the PPE that is going to be used to
perform the operations.
• Equipment check:
Check the voltage tester is working correctly:
- Perform an integrity check of the instrument in general; examine
the test terminals, its integrity and make sure they are properly fixed;
make sure the batteries level is enough high (don't use the instrument
in case the message "LOW BATTERY" is present) or replace them.
- Perform test of the instrument using an energized AC socket and a
DC voltage source (example: battery in the service car) with known
voltage level; in case the instrument is provided with a self-test feature,
follow the instructions provided in the instrument manual to carry out
the self-test.
Check the voltage tester is working correctly:
Check the DC current probe is properly working, make sure to perform
the "ZERO-OFFSET" procedure and to select DC measurement
range.
2. Wear the appropriate PPE for carrying out the operations (see "Clothing
and protection of personnel" paragraph of this procedure).
All the following activities (till the completion of the procedure) must be performed wearing the PPE
3. Check the absence of dangerous voltages on inverter enclosure
respect ground:
• Check the absence of dangerous voltage on the inverter chassis.
The measurement point are between inverter chassis (both power
module
and wiring box
01
outside the inverter.
10
- 144 -
8 - Maintenance
) and the Protective earth point (ext.)
02
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