AHF 005/010
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Warnings
The Danfoss harmonic filters AHF 005
and AHF 010 contain dangerous voltages
when connected to line voltages. Only
a competent electrician should carry out the
electrical installation. Improper installation of the
filter module or the connected adjustable frequency
drive may cause equipment failure, serious injury, or
death. Follow this manual and National Electrical
Codes and local safety codes.
Operation of the harmonic filter is only allowed
with a closed cover of the housing!
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Symbols used in this manual
When you read this manual, you will come across
different symbols that require special attention.
The symbols used are the following:
Warning of hazardous electrical voltage
Warning of a general danger
NOTE
This designates general, useful notes. If you
observe them, handling of the filter module
/ drive system is made easier.
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Operator’s safety
After line disconnection, the power
terminals X1.1, X1.2, X1.3, X3.1, X3.2,
X3.3, X4.1, X4.2, and X4.3 remain
live for minimum 15 minutes.
The filter modules must be installed in
such a way that they fulfill their function
and do not expose persons to danger.
They must be mounted correctly and used in
accordance with their purpose.
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Avoid filter module damage
1. The filter modules are to be used only with
Danfoss adjustable frequency drives. Usage
with other electrical loads is not permitted
and may damage the devices.
2. Do not use the drive system (adjustable frequency
drive, motor load, and filter module) if the
equipment has been damaged.
3. Modifications of the filter modules are not allowed.
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DC-link resonance
To avoid resonances in the DC link, it is possible to
disable the dynamic DC link compensation.
483 Dynamic DC link compensation
(DC LINK COMP.)
Value:
Off
[0]
✭
On
[1]
Function:
The VLT 5000, 6000, and 8000 series include a feature
which ensures that the output voltage is independent
of any voltage fluctuation in the DC link, e.g. caused
by fast fluctuation in the line supply voltage. The
benefit is a very steady torque on motor shaft (low
torque ripple) under most line conditions.
Description of choice:
In some cases, this very dynamic compensation can
cause resonances in the DC link and should then be
disabled. Typical cases are where a line choke or a
passive harmonic filter (e.g. filters AHF005/010) is
mounted in the line supply to the adjustable frequency
drive to suppress harmonics. Can also occur on line
power supplies with low short circuit ratio.
MG.80.B4.22 - VLT is a registered Danfoss trademark
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