Moeller DF5 series - Interaction with Compensation Devices; Fuses and Cable Cross-Sections; Protection of Persons and Domestic Animals with Residual-Current Protective Devices

09/01 AWB8230-1412GB
Connection to the mains
15
Interaction with compensation devices
The DF5 series frequency inverters only accept a minimal funda-
mental reactive power from the AC voltage supply. Compensation
is therefore unnecessary.
Fuses and cable cross-sections
When the devices are connected to the mains, the fuses and cable
cross-sections which are required are dependent on the rating of
the frequency inverter and the operation mode of the drive.
The recommended fuses and the assignment of the DF5 series
frequency inverters are listed in Section ”Cables and fuses”,
Page 112 in the Appendix.
The national and regional standards (e.g. VDE 0113, EN 60204)
must be observed and the necessary 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 can 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.
Protection of persons and domestic animals with residual-
current protective devices
Residual-current circuit-breakers RCCB (according to VDE 0100,
also referred to as ELCBs). Universal current sensitive ELCBs accor-
ding to EN 50178 and IEC 755.
The frequency inverter is internally equipped with a mains rectifier.
With a short circuit to an exposed conductive part, a fault DC
current can block the trip of the alternating current sensitive or
pulse current sensitive residual-current circuit-breaker and thus
eliminate the protective function. We therefore recommend the
use of:
•“Pulse current sensitive residual-current circuit-breakers” with
a rated current f 30 mA with frequency inverters with a single-
phase supply ( .
•”Universal current sensitive residual-current circuit-breakers”
with a rated current f 300 mA with frequency inverters with a
single-phase supply on frequency inverters with three-phase
supply .
The fault current recommended values of the DF5 series frequency
inverters and the assigned radio interference filter are listed in
Section ”Radio interference filter”, Page 115 in the Appendix.
Spurios tripping of a residual-current circuit-breaker can be
activated by the following:
• by capacitive compensation currents of the cable screens,
particularly with long screened motor cables,
• by simultaneous connection of multiple frequency inverters to
the mains supply,
• with the use of additional chokes and filters (radio interference
filter, line filter).
Caution!
Operation of the frequency inverters of the DF5 series on
the mains with p.f. correction equipment is only permitted
when this equipment is dampened with chokes.
Caution!
The voltage drop under load conditions should be consi-
dered when selecting the cable cross-section. 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. Select the
cross-section of the PE
-conductor as least as large as the
terminal capacity of the power terminals.
Identification on the residual-current circuit-breakers
Logo
Type alternating
current sensitive
(RCCB, Type AC)
pulse current
sensitive
(RCCB, Type A)
universal current
sensitive
(RCCB, Type B)
Caution!
Residual-current circuit-breakers may only be installed on
the primary side between the incoming supply and the
frequency inverter.
Warning!
Only use cables, residual-current circuit-breakers and
contactors which have a suitable rating. Otherwise there
is a danger of fire.