127Maintenance
EN
WARNING – B Some inverter parts may be subject to hazardous voltages for the operator. Before
performing any work on the inverter, follow this procedure for safely isolate the inverter.
WARNING – B Important note: It is important to remark the presence of auxiliary power supply
connected to the AC grid. The inverter is supplied either by DC and AC power, so that the
internal voltages are present even in case the DC switches (19) are open.
HOT SURFACE – C When the device has just been switched off, it may have hot parts as a result
of overheating of the heated components (e.g.: transformers, accumulators, coils, etc.) so be
careful where you touch.
1. PRELIMINARY CHECKS
Weather conditions:
It is of paramount importance to evaluate the weather conditions in the risk assessment prior any
intervention on the equipment. 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 a general integrity check of the instrument; 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 suitable DC measurement range.
2. PPE
WARNING – B All the following activities (till the completion of the procedure) must be performed
wearing the PPE.
Wear the appropriate PPE for carrying out the operations (overall resistant to electric arc, dielectric helmet
with visor, insulating gloves).
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