ABB PVS800-57B, Hardware Manual, Page: 12 / 84

12 Safety instructions

Performing electrical work
These precautions are for all personnel who do work on the inverter, its input and output
cables, the transformer or the photovoltaic generator.
WARNING! Obey these instructions to prevent injury or death, or damage to the
equipment. You must be a qualified electrician to do installation and service work.
Do these steps before you do installation or maintenance work on the inverter.
1. Clearly identify the work location.
2. Disconnect all possible voltage sources.
•
Disconnect the inverter from the AC supply (normally a disconnector or a breaker
on the HV side of the main transformer), because the AC main switch-
disconnectors do not remove the voltage from the AC output busbars of the
inverter.
•
Disconnect the inverter from the DC power supply (usually the DC circuit breakers
of the solar array junction boxes or the DC combiner box) because the DC main
switches do not remove the voltage from the inverter input busbars.
•
Open the AC main disconnection AC-Q2 (AC breaker or AC switch
disconnector), the DC main switch discoDC-Q1, the auxiliary power main
AC-Q30 or three phase input from external auxiliary power supply source.
•
Make sure that reconnection is not possible. Lock all of the disconnectors in the
open position and attach a warning notice to them.
•
After you disconnect the inverter, wait for 5 minutes to let the intermediate circuit
capacitors discharge before you continue.
3. Protect any other energized parts in the work location against contact.
4. Take special precautions when you do work near bare conductors.
5. Measure that the installation is not energized.
•
Make sure that the voltage measurement device works correctly with a live
voltage.
•
Use a voltage measurement device such as a multimeter with an impedance of at
least 1 Mohm and voltage measurement range up to 1000 V DC.
•
Make sure that the voltage between the inverter AC output terminals (L1, L2, L3)
and the grounding (PE) busbar is close to 0 V.
•
Make sure that the voltage between the inverter module UDC+ and UDC-
terminals and the grounding (PE) busbar is close to 0 V.
•
Make sure that the voltage between the DC input terminals DC+ and DC- and the
grounding (PE) busbar is close to 0 V.