ABB PRO-33.0-TL Series, Product Manual

Page: 15 / 136

Safety 15
Electrical safety
WARNING! Obey these instructions to prevent physical injury or death, or
damage to the equipment.
Only qualified electricians can install and connect the inverter.

Electrical safety rules
• Obey all electrical safety regulations of the installation country or region.
• Be aware that the inverter is connected to two voltage sources:
- The photovoltaic (PV) arrays at the DC connectors
- The public electrical grid at the AC connector
• Be aware that the DC terminals (DC+ and DC-) have dangerous voltages of up to
1,100 V.
• Do not do installation or cabling work, if the inverter is connected to the electrical
grid or to the PV arrays.
• Do not do work on the control cabling, if the inverter or external control circuits are
connected to power sources. There can be dangerous voltages (115 or 230 V) in
the external control circuits even when the inverter is isolated from the PV arrays
and the electrical grid.
• Do not do insulation resistance tests or voltage withstand tests on the inverter.
• Do not open the second cover of the inverter. Dangerous voltages can be present
inside.
• Before you do work on the inverter, isolate the inverter from all power sources.
• Make sure that you can access the external AC breakers and fuses.
• Do not disconnect the DC connectors when they are under load. Use sealing caps
to prevent water and dirt in the disconnected PV quick connectors.
• If it is present, the DC switch isolates the PV array from the electrical grid. The DC
input and AC output connectors or DC fuses can have hazardous voltages
regardless of the DC switch position.
• Be aware that the AC and DC cables can have dangerous voltages when they are
not connected to the inverter.