10/05 AWB8230-1541GB
Intended use
13
For the frequency inverter’s rated output current, see the
paragraph “Technical data” in the appendix from page 189.
Intended use
The DF51 frequency inverters are not domestic appliances. They
are designed only for industrial use as system components.
The DF51 frequency inverters are electrical apparatus for
controlling variable speed drives with three-phase motors. They
are designed for installation in machines or for use in combination
with other components within a machine or system.
After installation in a machine, the frequency inverters must not be
taken into operation until the associated machine has been
confirmed to comply with the safety requirements of Machinery
Safety Directive (MSD) 89/392/EEC and meets the requirements of
EN 60204. The user of the equipment is responsible for ensuring
that the machine use complies with the relevant EU Directives.
The CE markings on the DF51 frequency inverter confirm that,
when used in a typical drive configuration, the apparatus complies
with the European Low Voltage Directive (LVD) and the EMC
Directives (Directive 73/23/EEC, as amended by 93/68/EEC and
Directive 89/336/EEC, as amended by 93/68/EEC).
In the described system configurations, DF51 frequency inverters
are suitable for use in public and non-public networks. Depending
on their location of use, external filtering may be necessary.
A connection to IT networks (networks without reference to earth
potential) is permissible only to a limited extent, since the device’s
built-in filter capacitors connect the network with the earth
potential (enclosure). On earth free networks, this can lead to
dangerous situations or damage to the device (isolation
monitoring required).
On the output of the frequency inverter (terminals U, V, W) you
must not:
• connect a voltage or capacitive loads (e.g. phase compensation
capacitors),
• connect multiple frequency inverters in parallel,
• make a direct connection to the input (bypass).
Observe the technical data and terminal requirements. Refer to the
equipment nameplate or label and the documentation for more
details.
Any other usage constitutes improper use.
h
If a motor switches during operation on the output of a
frequency inverter, the current draws a multiple of its
rated current. When you select a frequency inverter, make
sure that the starting current plus the sum of the currents
of the running motors will not exceed the rated output
current of the frequency inverter.
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