1
General information
BU 0500 GB
Subject to technical alterations
11
1.4 Safety and installation information
NORDAC SK 5xxE frequency inverters are equipment for use in industrial high voltage systems and are
operated at voltages that could lead to severe injuries or death if they are touched.
•
Installation and other work may only be carried out by qualified electricians and when the device is
disconnected. The manual must always be available for these persons and must be complied with.
•
Local regulations for the installation of electrical equipment as well as for accident prevention must
be complied with.
•
The equipment continues to carry hazardous voltages for up to 5 minutes after being switched off
at the mains.
•
For single phase operation (230V) the mains impedance must be at least 100
μ
H for each
conductor. If this is not the case, a mains choke must be installed.
•
For safe isolation from the mains, all poles of the supply cable to the frequency inverter must be
able to be disconnected.
•
Even during motor standstill (e.g. caused by a release block, blocked drive or output terminal short
circuit), the line connection terminals, motor terminals and braking resistor terminals may still
conduct hazardous voltages. A motor standstill is not identical to galvanic isolation from the mains.
•
Attention
, even parts of the control card and, in particular, the connection plug for the removable
technology units can conduct hazardous voltages. The control terminals are mains voltage free.
•
Warning
, under certain settings the inverter can start automatically after the mains are switched on.
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The frequency inverter is only intended for permanent connection and may not be operated without
effective earthing connections that comply with local regulations for large leak currents (> 3.5mA).
VDE 0160 requires the installation of a second earthing conductor or an earthing conductor cross-
section of at least 10 mm
2
.
•
Normal
FI-circuit breakers
are not suitable as the sole protection in three-phase frequency
inverters when local regulations do not permit a possible DC proportion in the faulty current. The FI
circuit breaker must be an all-mains sensitive FI circuit breaker (type B) as per EN 50178 / VDE
0160.
•
In normal use, NORDAC 5xxE frequency inverters are maintenance free. The cooling surfaces
must be regularly cleaned with compressed air if the ambient air is dusty.
CAUTION
The heat sink and all other metal components can heat up to temperatures above
70°C.
When mounting, sufficient distance from neighbouring components must be
maintained. When working on the components, allow sufficient cooling time beforehand
ATTENTION
DANGER TO LIFE!
The power unit can continue to carry voltages for up to 5 minutes after being switched
off at the mains. Inverter terminals, motor cables and motor terminals may carry
voltage!
Touching open or free terminals, cables and equipment components can lead to
severe injury or death!
Work may only be carried out by qualified specialist electricians and with the electrical
supply to the equipment disconnected!
