General Warning; These Rules Concern Your Safety; Warning Against Unintended Start - Danfoss VLT FCD 311 Design Manual

General 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. Conse-
quently, 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 disconnected
from the mains if repair work is to be carried out.
Check that the mains supply has been discon-
nected and that the prescribed time has passed
before removing the inverter part from the instal-
lation.
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 lo-
cal regulations.
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.
195NA194.10
4
®
VLT FCD Series
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 protection to
data value ETR trip or data value ETR warning.
For the North American market: The ETR func-
tions provide overload protection of the motor,
class 20, in accordance with NEC.

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 con-
nected to mains. If personal safety considerations
make it necessary to ensure that no unintended
start occurs, these stop functions are not suffi-
cient.
2. While parameters are being changed, the motor
may start. Consequently , the stop key [STOP/RE-
SET] 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 con-
verter, or if a temporary overload or a fault in the
supply mains or the motor connection ceases.
Warning:
MG.04.A1.02 - VLT is a registered Danfoss trade mark