High voltage warning
The voltage of the frequency converter is
dangerous whenever the converter is con-
nected 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 disconnec-
ted 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 discon-
nect 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 pro-
tected against overloading pursuant to pre-
vailing national and local regulations.
4.
The earth leakage currents are higher than
3.5 mA.
5.
Protection against motor overload is not in-
cluded 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 protec-
tion 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, refer-
ences or a local stop, while the frequency
converter is connected to mains. If personal
safety considerations make it necessary to
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 activated,
following which data can be modified.
3.
A motor that has been stopped may start if
faults occur in the electronics of the frequen-
cy converter, or if a temporary overload or a
fault in the supply mains or the motor con-
nection ceases.
Use on isolated mains
See section
RFI Switch
regarding use on isolated
mains.
It is important to follow the recommendations regard-
ing installation on IT-mains, since sufficient protection
of the complete installation must be observed. Not tak-
ing care using relevant monitoring devices for IT-
mains may result in damage.
MG.27.E2.02 - VLT is a registered Danfoss trademark
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