2 Safety and Conformity
2.1 Safety
2.1.1 Safety Note
WARNING
DANGEROUS VOLTAGE
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 frequency converter must be disconnected
from mains if repair work is to be carried out.
Check that the mains supply has been discon-
nected and that the necessary time has passed
before removing motor and mains plugs.
2. The [Off/Reset] key on the LCP 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 set by
1-90 Motor Thermal Protection
. If this function is
desired,
set 1-90 Motor Thermal Protection to data
value [ETR trip] (default value) or data value [ETR
warning]. Note: The function is initialized at 1.16
x rated motor current and rated motor frequency.
For the North American market: The ETR
functions provide class 20 motor overload
protection 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 necessary
time has passed before removing motor and
mains plugs.
7. Check that all voltage inputs have been discon-
nected and that the necessary time has passed
before commencing repair work.
Installation at high altitudes
CAUTION
At altitudes above 2 km, contact Danfoss regarding PELV.
WARNING
UNINTENDED START
1. The motor can be brought to a stop with 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/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 frequency
converter, or if a temporary overload or a fault in
the supply mains or the motor connection ceases.
2.1.2 Safety
WARNING
HIGH VOLTAGE!
Frequency converters contain high voltage when
connected to AC mains input power. Installation, start up,
and maintenance should be performed by qualified
personnel only. Failure to perform installation, start up, and
maintenance by qualified personnel could result in death
or serious injury.
High Voltage
Frequency converters are connected to hazardous mains
voltages. Extreme care should be taken to protect against
shock. Only trained personnel familiar with electronic
equipment should install, start, or maintain this equipment.
Safety and Conformity
VLT
®
Micro Drive FC 51 Design Guide
10 MG02K202 - VLT
®
is a registered Danfoss trademark
22
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