141MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
It is therefore important to take static
electricity into account when servicing elec-
tronic equipment.
When performing field service on Danfoss
VLT
®
frequency converters the following
precautions must be taken:
• A portable ESD field service kit
consisting of a wrist strap and a
conductive mat must be used.
• The portable ESD field service kit must
be connected to the same potential as
the VLT
®
frequency converter.
• Replaced defective control cards must
be placed in antistatic packing. The
packing from the new card could be
used for this purpose.
Electrostatic discharge
(ESD)
Important! Many electronic components
are sensitive to static electricity. Even
voltages so low that they cannot be felt,
seen or heard can impair components or
damage them completely.
Electronic discharge can, among other
things, result in the following:
• Drastic reduction in component
operating life
• Periodic faults - as a rule concurrently
with varying temperature, vibration or
varying load.
• Faults that are difficult to trace and that
cannot be located by testing.
Electrostatic discharge
Use the flow charts
The fault location procedure on the
following flow charts takes as its starting
point the main faults affecting the motor,
i.e.
• Motor runs unevenly
• Motor does not run
• Motor does not brake
The flow chart layout is generally in a
form applicable to all VLT
®
frequency con-
verters, although at certain points it is
necessary to distinguish between some of
the types.
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