VLT
®
8000 AQUA
■
General information about electrical installation
■
High voltage warning
The voltage of the AFD is dangerous
whenever the equipment is connected to
line. Incorrect installation of the motor
or the AFD may cause damage to the equipment,
serious personal injury or death. Consequently,
the instructions in this manual, as well as national
and local safety regulations, must be complied
with. Touching the electrical parts may be fatal
- even after disconnection from line:
Using VLT 8006-8062, 200-240 V wait at
least 15 minutes
Using VLT 8006-8072, 380-480 V wait at
least 15 minutes
Using VLT 8102-8352, 380-480 V wait at
least 20 minutes
Using VLT 8450-8600, 380-480 V wait at
least 15 minutes
Using VLT 8002-8006, 525-600 V wait at
least 4 minutes
Using VLT 8008-8027, 525-600 V wait at
least 15 minutes
Using VLT 8032-8300, 525-600 V wait at
least 30 minutes
NOTE
It is the user
’
s or certified electrician
’
s
responsibility to ensure correct grounding
and protection in accordance with applicable
national and local codes and standards.
■
Grounding
The following basic issues need to be considered
when installing an AFD.
•
Safety grounding:
Please note that the
AFD has a high leakage current and must
be grounded appropriately for safety reasons.
Apply local safety regulations.
•
High-frequency grounding:
Keep the ground
wire connections as short as possible.
Connect the different ground 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. A flat conductor, for
example, has a lower HF impedance than a round
conductor for the same conductor cross-section C
VESS
.
If more than one device is installed in cabinets, the
cabinet rear plate, which must be made of metal,
should be used as a common ground reference
plate. 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.
■
Cables
Control cables and the filtered line cable should
be installed separate from the motor cables so
as to avoid interference overcoupling. Normally,
a distance of 204mm (8 in) will be sufficient, but
it is recommended to keep the greatest possible
distance wherever possible, especially where cables
are installed in parallel over a substantial distance.
With respect to sensitive signal cables, such as
telephone cables and data cables, the greatest
possible distance is recommended with a minimum
of 1m (3 ft) per 5m (15 ft) of power cable (line
and motor cable). It must be pointed out that
the necessary distance depends on the sensitivity
of the installation and the signal cables, and that
therefore no precise values can be stated.
If cable jaws are used, sensitive signal cables
are not to be placed in the same cable jaws as
the motor cable or brake cable.
If signal cables are to cross power cables, this should
be done at an angle of 90 degrees.
Remember that all interference-filled in- or
outgoing cables to/from a cabinet should be
shielded/armored or filtered.
■
Shielded/armored cables
The shield must be a low HF-impedance shield.
This is ensured by using a braided shield of copper,
MG.80.A7.22 - VLT is a registered Danfoss trademark
52
Rosewood STP ST42 General (Operation and Maintenance Manual - Part 4:
Section 6.3 Manufacturers Manuals 6.3.33 Danfoss VLT Aquadrive 8000) Vendor Manual
QP Id: VM207
Active: 03/09/2013
Page 58 of 208
