ABB ACS800-67LC, Hardware Manual

Page: 12 / 154

12 Safety instructions
Hot surface warning warns about hot surfaces. Some parts inside the converter
cabinet remain hot for a while after the disconnection of input power.
Safety in installation and maintenance

Electrical safety
These warnings are intended for all who work on the converter or generator. Ignoring the
instructions can cause physical injury or death, or damage to the equipment.
WARNING!
•
Only qualified electricians are allowed to install and maintain the converter!
•
Before working in the incoming cubicle, isolate the whole converter from the electrical
power supply network. The load switch disconnector (C111) or air circuit
breaker (oC108/+109) does not remove the voltage from the grid-side
connection terminals of the converter.
•
Never work on the converter or generator when input power is applied. After
disconnecting the input power, always wait for 10 minutes to let the intermediate circuit
capacitors discharge before you start working on the converter or generator. Always
ensure by measuring with a multimeter the voltage between the power terminals and
earth and DC link and earth that the converter does not have any live parts before
beginning work.
•
Apply temporary grounding before working on the unit. The converter does not have
internal grounding device, therefore external equipment is required.
•
Do not work on the control cables when input power is applied to the converter or to
the external control circuits. Externally supplied control circuits (eg, UPS) may carry
dangerous voltage even when the input power of the converter is switched off.
•
Live parts inside the cubicle are protected against direct contact. However, pay special
attention when handling metallic shrouds. The cabinet is protected to IP54 only when
doors are closed.
•
Do not make any withstand voltage tests on the converter.
•
Isolate the cables from the converter when testing the insulation resistance or
withstand voltage of the power cables or the generator.
•
When reconnecting the cables, always check that the phase order is correct.
Note:
•
The rotor cable terminals may contain a dangerously high voltage when the input
power is on, regardless of whether the generator is running or not.
•
The converter DC link may contain a dangerously high voltage, regardless of whether
the converter is running or not.
•
Depending on the external wiring, dangerous voltage (115 V or 230 V) may be present
on the relay outputs of the converter system.