Safety Regulations; Warning Against Unintended Start - Danfoss VLT 7000 Series Manual

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

Safety regulations

1. The frequency converter must be disconnected
from mains if repair work is to be carried out. Check
that the mains supply has been disconnected
and that the necessary time has passed before
removing motor and mains plugs.
2. The [OFF/STOP] 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. Correct protective earthing of the equipment
must be established, the user must be protected
against supply voltage, and the motor must be
protected against overload in accordance with
applicable national and local regulations.
4. The earth leakage currents are higher than 3.5 mA.
5. Protection against motor overload is included in
the factory setting. Parameter 117, Motor thermal
protection default value is ETR trip 1.
Note: The function is initialised at 1.0 x rated
motor current and rated motor frequency (see
parameter 117, Motor thermal protection).
MG.70.A1.02 - VLT is a registered Danfoss trademark
VLT® 7000 Booster
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 necessary time has
passed before removing motor and mains plugs.
7. Please 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 have been
disconnected and that the necessary 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 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
[OFF/STOP] 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 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.
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