2 Assembly and installation
BU 0800 en-4521 33
Damage due to high voltage
The device may be damaged by electrical loads which do not correspond to its specification.
• Do not perform any high voltage tests on the device itself.
•
Disconnect the cable which is to be tested from the device before performing a high voltage
insulation test.
If the device is installed according to the recommendations in this manual, it meets all EMC directive
requirements, as per the EMC product standard EN 61800-3.
2.6.5 Electrical connection of power unit
EMC interference to the environment
This device produces high-frequency interference, which may make additional suppression measures
necessary in domestic environments ( 8.1 "Electromagnetic compatibility (EMC)").
The use of shielded motor cables is essential in order to maintain the specified radio interference
suppression level.
When connecting the device, observe the following:
• The mains supply provides the correct voltage and is suitable for the current required ( 7
"Technical data").
• Suitable electrical fuses with the specified nominal current range are installed between the voltage
source and the device.
• Mains cable connection: on option slot X1 in NORDAC ON motor-mounted, X4 in NORDAC ON+
motor-mounted, NORDAC ON and NORDAC ON+ wall-mounted.
• Motor cable connection: on option slot X8
At least one four-core motor cable must be used and U-V-W and PE connected to the plug
connector.
• Only copper cables with temperature class 80 °C or equivalent may be used for all connections.
2.6.5.1 Mains connection
No special fuses are required on the mains input side of the device. It is advisable to use mains fuses
(see technical data) and a main switch or contactor.
Isolation from or connection to the mains must always be carried out synchronously and for all poles.
In the standard version, the device is configured for operation in TN or TT networks. The mains filter
provides its normal effect and the resulting leakage current. A star point-earthed mains must be used.
Unexpected movement in case of mains faults
In case of a mains fault (short circuit to earth) a frequency inverter which is switched off may switch
on automatically. Depending on the parameterisation, this may cause the drive unit to start
automatically and therefore cause a risk of injury.
• Secure the system against unexpected movement (block, decouple mechanic
protection against falling, etc.)
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