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Motor connection
Connect the motor to terminals 96, 97, 98. Connect
earth to terminal 99.
No. 96 97
98
Motor voltage 0-100% of mains
voltage.
U
V
W 3 wires of motor
U1
W2
V1
U2
W1
V2
6 wires out of motor, Delta con-
nected
U1 V1 W1 6 wires out of motor, Star con-
nected
U2, V2, W2 to be interconnec-
ted separely (optional terminal
block)
No. PE
Earth
connection
See
Technical data
for correct dimensioning of cable
cross-section.
All types of three-phase asynchronous standard mo-
tors can be connected to a frequency converter. Nor-
mally, small motors are star-connected (230/400 V,
Δ
/ Y). Large motors are delta-connected (400/690 V,
Δ
/ Y). The correct connection mode and voltage can
be read from the motor nameplate.
NB!
In motors without phase insulation paper,
an LC filter should be fitted on the output
of the frequency converter.
RFI switch
Mains supply isolated from earth:
If the frequency converter is supplied from an isolated
mains source (IT mains) or TT/TN-S mains with groun-
ded leg, the RFI switch is recommended to be turned
off (OFF). 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 ca-
pacitors) between the chassis and the intermediate
circuit are cut off to avoid damage to the intermediate
circuit and to reduce the earth capacity currents (ac-
cording 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!
The RFI switch disconnects the capaci-
tors galvanically from ground.
The switch Mk9, placed next to terminal 96, should be
removed to disconnect the RFI-filter.
The RFI switch is only available on VLT 2880-2882.
Direction of motor rotation
The factory setting is for clockwise rotation with the
frequency converter transformer output connected as
follows:
Terminal 96 connected to U-phase.
Terminal 97 connected to V-phase.
Terminal 98 connected to W-phase.
The direction of rotation can be changed by switching
two phases on the motor terminals.
VLT
®
2800 Series
68
MG.27.A2.02 - VLT
®
is a registered Danfoss trademark
Содержание VLT 2800 Series
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Страница 62: ...192H4893 VLT 2800 Series MG 27 A2 02 VLT is a registered Danfoss trademark 61 Installation...
Страница 76: ...VLT 2800 Series MG 27 A2 02 VLT is a registered Danfoss trademark 75 All about VLT 2800...
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