High Voltage Warning; These Rules Concern Your Safety; Warning Against Unintended Start - Danfoss VT2800 Series Design Manual

High voltage warning

The voltage of the frequency converter
is dangerous whenever the converter
is connected to mains. Incorrect fitting
of the motor or frequency converter may cause
damage to the equipment, serious injury or death.
Consequently, it is essential to comply with the
instructions in this manual as well as local and
national rules and safety regulations.

These rules concern your safety

1. The frequency converter must be disconnected
from the mains if repair work is to be carried
out. Check that the mains supply has been
disconnected and that the prescribed time has
passed before removing motor and mains plugs.
2. The [STOP/RESET] key on the control panel of
the frequency converter does not disconnect
the equipment from mains and is thus not
to be used as a safety switch.
3. The unit must be properly connected to the
earth, the user must be protected against the
supply voltage and the motor must be protected
against overloading pursuant to prevailing
national and local regulations.
4. The earth leakage currents are higher than 3.5 mA.
5. Protection against motor overload is not included
in the factory setting. If this function is required,
set parameter 128 Motor thermal protection to
data value ETR trip or data value ETR warning. For
the North American market: The ETR functions
provide overload protection of the motor, class
20, in accordance with NEC.
6. Do not remove the plugs for the motor - and mains
supply while the frequency converter is connected
to mains. Check that the mains supply has been
disconnected and that the prescribed time has
passed before removing motor and mains plugs.
7. Note that the frequency converter has more voltage
inputs than L1, L2 and L3 when the DC bus
terminals are used. Check that all voltage inputs
are disconnected and that the prescribed time has
passed before repair work is commenced.

Warning against unintended start

1. The motor can be brought to a stop by
means of digital commands, bus commands,
references or a local stop, while the frequency
converter is connected to mains. If personal
safety considerations make it necessary to
MG.28.E9.02 - VLT is a registered Danfoss trademark
®
VLT 2800 Series
ensure that no unintended start occurs, these
stop functions are not sufficient.
2. While parameters are being changed, the
motor may start. Consequently, the stop key
[STOP/RESET] must always be acti v ated, following
which data can be modified.
3. A motor that has been stopped may start if faults
occur in the electronics of the frequency converter,
or if a temporary overload or a fault in the supply
mains or the motor connection ceases.
Use on isolated mains
See section RFI Switch regarding use on isolated mains.
It is important to follow the recommendations
regarding installation on IT-mains, since sufficient
protection of the complete installation must be
observed. Not taking care using relevant monitoring
devices for IT-mains may result in damage.
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