VLT® 5000 Crane
Installation
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RFI switch
Mains supply isolated from earth:
If the frequency converter is supplied from an isolated
mains source ( IT mains), the RFI switch can be
turned off (OFF). In OFF position, the internal RFI
capacities (filter capacitors) between the chassis and
the intermediate circuit are cut off to avoid damage
to the intermediate circuit and to reduce the earth
capacity currents (according to IEC 61800-3).
NB!:
The RFI switch is not to be operated with
mains connected to the unit. Check that
the mains supply has been disconnected
before operating the RFI switch.
NB!:
Open RFI switch is only allowed at factory
set switching frequencies.
NB!:
The RFI switch disconnects the capacitors
galvanically to ground.
The red switches are operated by means of e.g. a
screwdriver. They are set in the OFF position when
they are pulled out and in ON position when they are
pushed in (see drawing below). Factory setting is ON.
Mains supply connected to earth:
The RFI switch must be in ON position in order for the
frequency converter to comply with the EMC-standard.
Position of RFI switches
Compact IP 20/NEMA 1
VLT 5042 - 5062 400 - 500 V
MG.50.N4.02 - VLT is a registered Danfoss trademark
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