NORDAC SK 750E manual
8 Technical design subject to change BU 0750 GB
1.4 Safety and installation instructions
NORDAC SK 750E 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 are 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 at any time and observe them
conscientiously without exception.
Local regulations governing the installation of electric plant as well as any regulations for accident pre-
vention 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 control penels be detached until 5
minutes after it has been disconnected from supply. Reattach all covers before switching the mains
voltage on again.
For the device to be safely disconnected from the mains be sure that each of the poles of the mains
lead to the frequency inverter is disconnected.
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 conduct dangerously voltages. 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 con-
nected to the mains.
The printed circuit boards carry highly sensitive MOS semiconductor components for which static elec-
tricity can be particularly harmful. That is why you should avoid touching the conductive tracks or elec-
tronic components with your hands or with metallic objects. When connecting the cables, use insulated
screwdrivers 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 (> 3,5mA). German VDE
0160 demands that either a second earth conductor be laid or that the earth conductor cross section
be 10mm
2
minimum.
If to conform with local regulations the leakage current must not contain any proportion of direct cur-
rent 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 750E frequency inverters are maintenance-free provided that they are operated accord-
ing to instructions. In a dusty environment the cooling surfaces must be cleaned with compressed air
at regular intervals.
The temperature of the heat sink and of any other metallic parts may rise to more than 70°C.
While working to install the device keep a sufficient distance to components next to your work-
ing area. Do not start working on the components before these have sufficiently cooled down.
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!
Only skilled personnel qualified in electrotechnical professions are allowed to perform the work
required. Before they do, the device must always have been disconnected from the mains.
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