Safety; Warnings; Symbols Used In This Manual; Operator's Safety - Danfoss VLT AHF 005 Operating Instructions Manual

Warnings

The Danfoss harmonic filter AHF 005 and
AHF 010 contain dangerous voltages
when connected to line voltages. Only a
competent electrician should carry out the
electrical installation. Improper installa-
tion of the filter module or the connected
frequency converter may cause equip-
ment failure, serious injury or death. Fol-
low this manual and National Electrical
Codes and local safety codes.
Operation of the harmonic filter is only al-
lowed with a closed cover of the housing!

Symbols used in this manual

When you read this manual you will come across dif-
ferent symbols that require special attention. The sym-
bols used are the following:
Warning of hazardous electrical voltage
Warning of a general danger
NB!
This note designates general, useful
notes. If you observe it, handling of the fil-
ter module / drive system is made easier.

Operator's safety

After mains disconnections, the power ter-
minals X1.1, X1.2, X1.3, X3.1, X3.2, X3.3,
X4.1, X4.2 and X4.3 remain live for mini-
mum 4 minutes.
The filter modules have to be installed in
a way, that they fulfil their function and
don't expose persons to danger. They
have to be mounted correctly and used in
accordance with their purpose.
2
AHF 005/010

Avoid filter module damage

1. The filter modules are to be used only with
Danfoss frequency converters. The usage
with other electrical loads is not permitted
and may damage the devices.
2. Don't use the drive system (frequency con-
verter, motor load and filter module) if the
equipment has been damaged.
3. Modifications of the filter modules are not al-
lowed.

DC-link resonance

To avoid resonance's in the DC-link, it is possible to
disable the dynamic DC link compensation.
483 Dynamic DC link compensation
(DC link comp.)
Value:
Off
On
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 mains supply voltage. The
benefit is a very steady torque on motor shaft (low tor-
que ripple) under most mains conditions.
Description of choice:
In some cases this very dynamic compensation can
cause resonance's 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 mains supply to the frequency con-
verter to suppress harmonics. Can also occur on
mains with low short circuit ratio.
®
MG.80.B5.02 - VLT is a registered Danfoss trademark
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