AHF 005/010
All about VLT 8000
AQUA
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Power wiring
Standard connection
Supply voltage must be connected to the terminals
X1.1, X1.2 and X1.3. The adjustable frequency drive
supply terminals L1, L2, and L3 must be connected to
the filter module terminals X2.1, X2.2, and X2.3.
Paralleling of AFDs
If several adjustable frequency drives are to be
connected to the harmonic filter, the connection
is similar to the standard connection - The supply
terminals L1, L2 and L3 of several adjustable
frequency drives must be connected to the filter
module terminals X2.1, X2.2 and X2.3.
NOTE
If several AFDs are to be connected to
the same filter, the harmonic filter must
be sized according to the sum of the
calculated input current to the AFDs.
Paralleling of filters
If the line input current of the adjustable frequency drive
exceeds the nominal current of the largest harmonic
filter, several harmonic filters can be paralleled to
achieve the necessary rating. Supply voltage must
be connected to the terminals X1.1, X1.2 and X1.3
of the filters. The adjustable frequency drive supply
terminals L1, L2 and L3 must be connected to the
filter modules terminals X2.1, X2.2 and X2.3.
NOTE
Filters of different current ratings can be
paralleled. The rating of the filter becomes the
sum of the individual current ratings.
Capacitor disconnect
The power factor of the harmonic filter AHF 005/010
decreases with decreasing load. At zero load, the
power factor becomes zero and the capacitors produce
approximately 30% leading current compared to the
rated current of the filter. The reactive current generated
by the filter at partial load is normally not of any concern,
mainly because of the small current compared to the
system capacity (max 30%) as well as the fact that other
load normally compensates the capacitive current.
In applications where this reactive current may not be
accepted, Terminals X3.1, X3.2, X3.3 and X4.1, X4,
X4.3 give access to the filter capacitors. By default
(on delivery), the wiring will shorten Terminal X3.1
with X4.1, X3.2 with X4.2 and X3.3 with X.4.3. In
the case that no capacitor disconnect is required, no
changes should be made. If capacitor disconnect
is required, a three-phase contactor should be
placed between terminals X3 and X4. Size the
contactor and wiring to 50% of the nominal current
and use the AC3 rating of the contactor
NOTE
Only switch the contactor at less than 20% load.
Allow minimum 5 minutes for the capacitors
to discharge before turning on again.
Use cables complying with local regulations.
MG.80.B4.22 - VLT is a registered Danfoss trademark
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