NORD Drivesystems BU0710 - Manual (Page 7)

2 Installation procedure
BU 0710 GB 7
2 Installation procedure
2.1 Safety and installation instructions
NORDAC SK 700E frequency inverters are operational equipment for use in industrial power plant. That is
why touching them may cause, due to the voltages at which they are operated, serious injuries or even
death.
• Only skilled personnel qualified in electrotechnical professions is allowed to perform
installation or any other work on the devices provided that these have been previously
disconnected from supply. The personnel involved must have access to the operating
instructions any time and observe them conscientiously without exception.
• Local regulations governing the installation of electric plant as well as any regulations for
accident prevention have to be followed.
• The device continues to be dangerously live for up to 5 minutes after its disconnection from
the mains. Accordingly the device must not be opened or either the covers or the control
panel be detached until 5 minutes after it has been disconnected from supply. Reattach all
covers before switching the mains voltage on again.
• Even when the motor has stopped (e.g. following electronic disable, jamming of the drive, or
a short circuit of the output terminals), the supply terminals, the motor terminals, and the
terminals for the braking resistor can be dangerously live. Even if the motor is not running it
can by no means be assumed that it is also electrically isolated from the mains.
• Caution, parts of the control board and especially the female connector for the detachable
equipment boxes are dangerously live, too. No mains potential is applied to the control
terminals, however.
• Caution, certain setting configurations may cause the inverter to start up automatically when
it is connected to the mains.
• The printed circuit boards carry highly sensitive MOS semiconductor components for which
static electricity can be particularly harmful. That is why you should avoid to touch the
conductive tracks or electronic components with your hands or with metallic objects. When
connecting the cables, use insulated screw drivers to manipulate the screws of the terminal
strips.
• The inverter is intended for permanent connection only and must not be operated without
having been effectively earthed as stipulated by the local regulations for high leakage
currents (> 3.5 mA). German VDE 0160 demands that either a second earth conductor be
laid or that the earth conductor cross section be 10 mm
2 minimum.
• If to conform with local regulations the leakage current must not contain any proportion of
direct current at all, conventional fault-current circuit breakers alone will not afford
sufficient protection where three-phase frequency inverters are concerned. The construction
of standard fault-current circuit breakers is supposed to meet the new VDE 0664
requirements.
• NORDAC SK 700E frequency inverters are maintenance-free provided that they are
operated according to instructions. In a dusty environment the cooling surfaces must be
cleaned with compressed air at regular intervals.
CAUTION! DANGER!
The power section may still be live up to 5 minutes after disconnection from the mains.
Inverter terminals, motor supply cables, and motor terminals may be live, too!
Touching exposed or unconnected terminals, cables, or parts of the device may lead to
serious injuries or even death!