2.2 Safety
2.2.1 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.
The Protective Extra Low Voltage (PELV) requirements stated in IEC 61800-5-1 are not fulfilled at altitudes above 2000 m (6562 ft.).
For 200V frequency converters the requirements are not fulfilled at altitudes above 5000 m (16 404 ft.). Please contact Danfoss Drives
for further information.
2.2.2 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 the inverter part from the installation.
2.
The [STOP/RESET] key on the optional control panel 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 protec-
tion
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.
2.2.3 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 [STOP/RESET] on the optional control panel 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.
It can be extremely dangerous to touch the electrical parts even when the AC line supply has been disconnected.
For FCD 300: Wait at least 4 minutes.
2 Introduction to FCD 300
VLT
®
Decentral FCD 300 Design Guide
32
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
2
