Safety In Installation And Maintenance; Electrical Safety - ABB ACS355 Manual

8 Safety

Safety in installation and maintenance

These warnings are intended for all who work on the inverter, motor cable or motor.


Electrical safety

WARNING! Ignoring the following instructions can cause physical injury or death,
or damage to the equipment.
Only qualified electricians are allowed to install and maintain the inverter!
•
Never work on the photovoltaic generator or inverter and its input/output cables when
the inverter is connected to the power system or to the photovoltaic generator.
•
Before working inside the inverter cabinet, switch off or isolate the auxiliary voltage
supply to the inverter.
•
Isolate the inverter from the photovoltaic generator using the safety switch of the
generator or by using the isolation switch.
•
Do not touch the input of the isolation switch that has high DC voltage.
•
After disconnecting the inverter from the power system or the DC input supply, wait for
at least 5 minutes to discharge the intermediate circuit capacitors.
•
Measure with a multimeter to ensure that no voltage is present.
•
Impedance should be at least 1 MΩ.
•
Voltage should be close to 0 V between inverter phases L1, L2, L3 and frame, and
between module terminals Brk+ and Brk-.
•
Do not make any insulation or voltage withstand tests on the inverter or on the inverter
modules.
Note:
•
The DC connection terminals Brk+ and Brk- carry a dangerous DC voltage of up to
800 V.
•
Depending on the external and internal wiring, dangerous voltages of 115 V to 230 V
may be present at the different terminals in the auxiliary circuit.
•
At the inverter input, the photovoltaic cells generate DC voltage even at low intensity
of sunlight.