ABB PVS980-MWS - Safety Instructions for the Inverter and AC Cabinet Compartment

Safety instructions 13
 Safety instructions for the inverter and AC cabinet compartment
WARNING! Do the procedure before you start the work on the inverter. Ignoring
the instructions can cause physical injury or death, or damage to the equipment.
1. Identify the inverter that you need to work on. Read the inverter safety instructions in
the PVS980 central inverters hardware manual (3AXD50000026013 [EN]).
2. Disconnect the inverters from all power supplies (PV generator, transformer, AUX and
UPS), prevent connection and attach warnings.
• Stop the inverters.
• Disconnect the inverters from the AC supply (the breaker on the MV side of the
main transformer). The AC main switch disconnectors do not remove the voltage
from the AC output busbars of the inverter.
• Disconnect the inverters from the DC power supply (usually the DC circuit
breakers of the solar array junction boxes or the DC combiner box). The DC main
switches do not remove the voltage from the input busbars of the inverter.
• Open the AC main disconnection devices (AC breakers or AC switch
disconnectors) of all power units of both inverters (1Q4 and 2Q4), the DC main
switches of all the power sections (1Q1 and 2Q1), the auxiliary power main
switches of all the power sections (1Q10 and 2Q10), the optional 3-phase output
main switch (0Q12) and the 1-phase output circuit breakers (0F11 and 0F13).
• If applicable, open or set to off all auxiliary panel breakers.
• Make sure that connection is not possible. Lock all of the disconnectors in the
open position and attach warnings.
• After you disconnect the inverter, wait for 5 minutes to let the intermediate circuit
capacitors discharge before you continue.
3. Make sure that all shrouds and screens are in place. A shroud or screen can only be
removed if it is required to reach the parts that you do work on.
4. Make sure that you are not near any live parts when you do work. Disconnect live
circuits or protect them with shrouds or screens.
5. Make sure that the circuit is not energized at the AC and DC terminals of the inverters
and other accessible parts in the main circuit. Use a multimeter with suitable testing
heads.
6. Temporarily ground the inverter.
Temporarily ground the (INV1 and INV2) AC and DC sides of the inverter: Connect the
AC and DC busbars (in both DC sections) to the PE with a temporary grounding tool.
7. Make sure that you have a work permit.