Electrical Safety Precautions - ABB Fimer PVS980-58 Series Commissioning And Maintenance Manual

Electric welding
WARNING! Do not fasten the cabinet by electric welding. FIMER does not
assume any liability for damages caused by electric welding as the welding circuit
can damage electronic circuits in the cabinet, as well as the doors or the cabinet.

Electrical safety precautions


These precautions are for all personnel who work on the inverter, its input and output
cables, the transformer or the photovoltaic modules.
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.
Review these steps before you do installation or maintenance work on the
inverter.
1. Prepare for the work. Make sure that you have a work order. Select the applicable
personal protective equipment.
2. Clearly identify the work location and equipment. Make sure that there is an escape
route available in case of an emergency.
3. Disconnect all power sources and secure against reconnection. (Not all disconnectors
provide sufficient isolation against voltage surges.)
•
Disconnect the inverter from the AC supply (normally a disconnector or a breaker
on the HV side of the main transformer), because the optional AC disconnectors
or breakers of the inverter do not remove the voltage from the AC output busbars
of the inverter (a).
•
Disconnect the inverter from the DC power supply (usually the DC switches of the
solar array junction boxes or the DC combiner box), because the optional DC
disconnectors do not remove the voltage from the inverter input busbars or fuses
(b).
•
Disconnect the possible UPS or other auxiliary external power supplies (c).
•
Make sure that reconnection is not possible. Lock all of the disconnectors in the
open position and attach a warning notice to them (lockout-tagout).
•
After you disconnect the inverter, wait for at least 5 minutes to let the capacitors
discharge before you continue.
HV ring main unit (RMU)
8 Safety instructions
b
a
b
c
External
auxiliary
power