VLT® 5000 Crane
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EMC-Correct Electrical Installation
General points to be observed to ensure
EMC-correct electrical installation.
-
Use only screened/armoured motor cables and
screened/armoured control cables.
-
Connect the screen to earth at both ends.
-
Avoid installation with twisted screen ends (pigtails),
since this ruins the screening effect at high
frequencies. Use cable clamps instead.
-
It is important to ensure good electrical contact from
the installation plate through the installation screws
to the metal cabinet of the frequency converter.
-
Use toothed discs and galvanic conductive
installation plates.
-
Do not use unscreened/unarmoured motor
cables in the installation cabinets.
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Tightening-up Torques and Screw Sizes
The table shows the torque required when fitting
terminals to the frequency converter. For VLT
5042-5302 400-500 V, the cables must be fastened
with screws. For VLT 5122-5500 400-500 V, the
cables must be fastened with bolts.
These figures apply to the following terminals:
Mains terminals
Nos
91, 92, 93
L1, L2, L3
Motor terminals
Nos
96, 97, 98
U, V, W
Earth terminal
No
94, 95, 99
Brake resistor terminals
81, 82
Loadsharing
88, 89
400-500 V
5042
IP20
3
M5
4 mm Allen wrench
5042
3)
IP54
3
M5
4 mm Allen wrench
5052-5062
6
M6
5 mm Allen wrench
5072-5102
IP20
15
M6
6 mm Allen wrench
IP54
2)
24
M8
8 mm Allen wrench
5122-5302
4)
19
M10 bolt
1) Brake terminals: 3,0 Nm, Nut: M6
2) Brake and loadsharing: 14 Nm, M6 Allen screw
3) IP54 with RFI - Line terminals 6Nm, Screw: M6 - 5 mm Allen wrench
4) Loadshare and brake terminals: 9,5 Nm; Bolt M8
5) Brake terminals: 11,3 Nm; Bolt M8
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High Voltage Test
A high voltage test can be carried out by short-
circuiting terminals U, V, W, L
1
, L
2
and L
3
and
energizing by max. 2.15 kV DC for one second
between this short-circuit and the chassis.
NB!:
The RFI switch must be closed (position ON)
when high voltage tests are carried out.
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Motor Thermal Protection
The electronic thermal protection function in
UL-approved frequency converters has received
the UL-approval for single motor protection when
parameter 128 has been set for
ETR Trip
and
parameter 105 has been programmed to the rated
motor current (see motor nameplate).
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Extra Protection (RCD)
ELCB (Earth Leakage Circuit Breaker) relays,
multiple protective earthing or earthing can be
used as extra protection, provided that local
safety regulations are complied with. In case
of an earth fault, a DC content may develop in
the faulty current. If ELCB relays are used:
-
Local regulations must be complied with
-
Suitable for protecting equipment with a DC content
in the faulty current (3-phase bridge rectifier)
-
Suitable for a pulse-shaped, brief discharge
on power-up
-
Suitable for a high leakage current.
NB!:
Never use an RCD (ELCB relay), type A, as it
is not suitable for DC faulty currents.
MG.50.N4.02 - VLT is a registered Danfoss trademark
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