VLT
®
5000 Series
Installation
■ RFI switch
M
ains supply isolated from earth:
If the frequency converter is supplied from an isolated
mains source ( IT mains) or TT/TN-S mains with
grounded leg, the RFI switch is recommended to
be turned off (OFF)
1)
. For further reference, see
IEC 364-3. In case optimum EMC performance is
needed, parallel motors are connected or the motor
cable length is above 25 m, it is recommended
to set the switch in ON position.
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).
Please also refer to the application note VLT on
IT mains, MN.90.CX.02. It is important to use
isolation monitors that are capable for use together
with power electronics (IEC 61557-8).
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 connects the capacitors
galvanically to earth.
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. 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.
1) Not possible with 5042-5602, 525-690 V units.
Position of RFI switches
Bookstyle IP 20
VLT 5001 - 5006 200 - 240 V
VLT 5001 - 5011 380 - 500 V
Compact IP 20/NEMA 1
VLT 5001 - 5006 200 - 240 V
VLT 5001 - 5011 380 - 500 V
VLT 5001 - 5011 525 - 600 V
MG.51.A9.02 - VLT is a registered Danfoss trademark
63
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