01/02 AWB8230-1415GB
Connecting to the mains
15
Connecting to the mains
The DV6 frequency inverters can not be used in every network
configuration without limitations (network configuration accor-
ding to IEC 364
-
3).
Mains configurations
Networks with earthed centre point (TT/TN networks):
• DV6 frequency inverters can be used without limitations in TT
and TN networks. The ratings of the DV6 frequency inverters
must, however, be observed.
Networks with earthed centre point (IT networks):
• The use of DV6 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 isolates the
frequency inverter from the mains must be used.
Mains voltage, Mains frequency
The ratings of the DV6 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 185.
Interaction with p.f. correction equipment
The DV6 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
the drive’s operating mode.
The recommended fuses and their assignment to the DV6
frequency inverters are listed in the appendix, Section “Cables and
fuses“, Page 194.
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
UL
-
approved fuses, fuse bases and cables must be used.
The leakage currents to ground (according to EN 50178) are
greater than 3.5 mA. The PE terminal and the enclosure must be
connected to the earth-current circuit.
Caution!
In the event of an earth fault in an IT system, the capaci-
tors 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 over-
come this problem,fit additional isolating transformer to
the frequency inverter’s supply and earth the trans-
former’s secondary side at its centre point to form, in
effect, an individual TN network for the frequency
inverter.
Caution!
Operation of DV6 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!
The prescribed minimum cross-sections of 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.
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