VLT
®
5000/6000/8000 Series
■
Electrical installation
The voltage on the frequency converter
is dangerous when the unit is
connected to mains.
Incorrect installation of the motor or VLT
frequency converter may lead to material damage
or serious injury or it may be fatal.
Conse
quently, the instructions in this manual
as well as national and local rules and safety
regulations must be complied with.
Touch
ing the electrical parts may be fatal, even
after the mains supply has been disconnected.
Wait at least 15 minutes if using VLT 5300-5500,
VLT 6350-6550 or VLT 8350-8550.
NB!:
It is the user
’
s or certified electrician
’
s
responsibility to ensure correct earthing and
protection in accordance with applicable
national and local norms and standards.
All te
rminals for the control cables and power cables
are located behind the protective cover of the VLT
frequency converter. The protective cover can be
remo
ved by means of a screwdriver.
Once the protective cover has been removed, the
actual EMC-correct installation can start.
■
Pre-fuses
For VLT type 5300-5500, VLT type 6350-6550
and VLT 8350-8550, external pre-fuses must be
installed in the mains supply to the VLT frequency
converter or ordered with built-in pre-fuses and
a mains disconnect switch.
UL compliance
To comply with UL/cUL approvals, pre-fuses according to the table below must be used.
Bussmann SIBA Littel fuse Ferraz-Shawmut
5300/6350/8350 FWH-600 206xx32-600 L50S-600 A50-P600
5350/6450/8450 FWH-700 206xx32-700 L50S-700 A50-P700
5450/6500/8500 FWH-800 206xx32-800 L50S-800 A50-P800
5500/6550/8550 FWH-800 206xx32-800 L50S-800 A50-P800
Non UL compliance
If UL/cUL is not to be complied with, we recommend
the above mentioned fuses or type gR.
Not following the recommendation may result
in unnecessary damage of the drive in case of
malfunction. Fuses must be designed for protection
in a circuit capable of supplying a maximum of
100000 A
rms
(symmetrical), 500 V maximum.
■
Earthing
The following basic issues need to be considered
when installing a frequency converter, so as to
obtain electromagnetic compatibility (EMC).
•
Safety earthing: Please note that the frequency
converter has a high leakage current and must
be earthed appropriately for safety reasons.
Apply local safety regulations.
•
High-frequency earthing: Keep the earth wire
connections as short as possible.
Connect the different earth systems at the lowest
possible conductor impedance. The lowest possible
conductor impedance is obtained by keeping
the conductor as short as possible and by using
the greatest possible surface area.
The metal cabinets of the different devices are
mounted on the cabinet rear plate using the lowest
possible HF impedance. This avoids having different
HF voltages for the individual devices and avoids the
risk of radio interference currents running in connection
cables that may be used between the devices. The
radio interference will have been reduced.
In order to obtain a low HF impedance, use the
fastening bolts of the devices as HF connection to
the rear plate. It is necessary to remove insulating
paint or similar from the fastening points.
MG.56.A2.02 - VLT is a registered Danfoss trademark
14
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