2 Safety and Conformity
2.1 Safety Precautions
WARNING
The voltage of the frequency converter is dangerous
whenever connected to mains. Incorrect installation of the
motor, frequency converter or fieldbus may cause death,
serious personal injury or damage to the equipment.
Consequently, the instructions in this manual, as well as
national and local rules and safety regulations, must be
complied with.
Safety Regulations
1.
The mains supply to the frequency converter
must be disconnected whenever repair work is to
be carried out. Check that the mains supply has
been disconnected and that the necessary time
has elapsed before removing motor and mains
supply plugs.
2.
The [OFF] button on the control panel of the
frequency converter does not disconnect the
mains supply and consequently it must not be
used as a safety switch.
3.
The equipment must be properly earthed, 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 current exceeds 3.5mA.
5.
Protection against motor overload is not included
in the factory setting. If this function is desired,
set
1-90 Motor Thermal Protection
to data value
ETR trip 1 [4] or data value ETR warning 1 [3].
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 elapsed before removing motor and
mains plugs.
7.
Please note that the frequency converter has
more voltage sources than L1, L2 and L3, when
load sharing (linking of DC intermediate circuit)
or external 24V DC are installed. Check that all
voltage sources have been disconnected and that
the necessary time has elapsed before
commencing repair work.
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 consider-
ations (e.g. risk of personal injury caused by
contact with moving machine parts following an
unintentional start) make it necessary to ensure
that no unintended start occurs, these stop
functions are not sufficient. In such cases the
mains supply must be disconnected or the Safe
Stop function must be activated.
2.
The motor may start while setting the
parameters. If this means that personal safety
may be compromised (e.g. personal injury caused
by contact with moving machine parts), motor
starting must be prevented, for instance by use
of the Safe Stop function or secure disconnection
of the motor connection.
3.
A motor that has been stopped with the mains
supply connected, may start if faults occur in the
electronics of the frequency converter, through
temporary overload or if a fault in the power
supply grid or motor connection is remedied. If
unintended start must be prevented for personal
safety reasons (e.g. risk of injury caused by
contact with moving machine parts), the normal
stop functions of the frequency converter are not
sufficient. In such cases the mains supply must be
disconnected or the Safe Stop function must be
activated.
NOTE
When using the Safe Stop function, always follow the
instructions in the section
Safe Stop
of the VLT
AutomationDrive Design Guide.
4.
Control signals from, or internally within, the
frequency converter may in rare cases be
activated in error, be delayed or fail to occur
entirely. When used in situations where safety is
critical, e.g. when controlling the electromagnetic
brake function of a hoist application, these
control signals must not be relied on exclusively.
Safety and Conformity
FC 300 Design Guide
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
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