01/02 AWB8230-1413GB
Connection to the power
supply
15
Connection to the power supply
The DF6 frequency inverters can not be used in every network
configuration without limitations (network configuration
according to IEC 364-3).
Mains configurations
Networks with earthed centre point (TT/TN networks):
• DF6 frequency inverters can be used without limitations in TT
and TN networks. The ratings of the DF6 frequency inverters
must, however, be observed.
Networks with isolated centre point (IT networks):
• The use of DF6 frequency inverters in IT networks is only
permissible to a limited extent. In this case, a suitable device
(isolation monitor) to monitor earth faults and isolate the
frequency inverter from the mains must be used.
Mains voltage, mains frequency
The ratings of the DF6 frequency inverters cover European and
American standard voltages:
• 400 V, 50 Hz (EU) and 460 V, 60 Hz (USA)
The permissible mains voltage range is:
• 380/480 V: 342 V – 0 % to 528 V + 0 %
The permissible frequency range is 47 Hz – 0 % to 63 Hz + 0 %.
The motor rating to mains voltage assignments are listed in the
appendix, section “Technical Data”, page 159.
Interaction with p.f. correction equipment
The DF6 frequency inverters absorb only a small fundamental
reactive power from the AC supply. A p.f. correction is therefore
not necessary.
Fuses and cable cross-sections
The fuse ratings and cable cross-sections required for the network
connection depend on the rating of the frequency inverter and the
drive’s operating mode.
The recommended fuses and their assignment to the DF6
frequency inverters are listed in the appendix, section “Cables and
fuses”, page 164.
The national and regional standards (e.g. VDE 0113, EN 60204)
must be observed and any required approvals (e.g. UL) at the site
of installation must be fulfilled.
When the device is operated in a UL approved system, only
ULapproved fuses, fuse bases and cables must be used.
The leakage currents to earth (to EN 50178) are greater than
3.5 mA. The connection terminals marked PE and the enclosure
must be connected to the earth circuit.
Caution!
In the event of an earth fault in an IT system, the
capacitors of the frequency inverter which are switched to
earth are subjected to a very high voltage, and safe
operation of the frequency inverter is no longer
guaranteed. To overcome this problem,fit additional
isolating transformer to the frequency inverter’s supply
and earth the transformer’s secondary side at its centre
point to form, in effect, an individual TN network for the
frequency inverter.
Caution!
Operation of DF6 series frequency inverters on the mains
with p.f. correction equipment is only permitted when this
equipment is dampened with chokes.
Caution!
When selecting the cable cross-section, take the voltage
drop under load conditions into account. Compliance to
further standards (e.g. VDE 0113, VDE 0289) is the
responsibility of the user.
Caution!
Observe the specified minimum cross-sections for PE
conductors (EN 50178, VDE 0160) must be observed. Use
a PE conductor whose cross-section is as least as large as
the terminal capacity of the power terminals.
efesotomasyon.com - Klockner Moeller - inverter
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