Safety Regulations; Warning Against Unintended Start; Installation Of Mechanical Brake - Danfoss VLT 5000 Series Instruction Manual

Safety regulations

1. The frequency converter must be disconnec-
ted 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 [STOP/RESET] key on the control panel
of the frequency converter does not discon-
nect 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 pro-
tected against supply voltage, and the motor
must be protected against overload in ac-
cordance with applicable national and local
regulations.
4. The earth leakage currents are higher than
3.5 mA.
5. Protection against motor overload is not in-
cluded in the factory setting. If this function is
desired, set parameter 128 to data value ETR
trip or data value ETR warning.
Note: The function is initialised at 1.16 x rated
motor current and rated motor frequency. For
the North American market: The ETR func-
tions provide class 20 motor overload pro-
tection in accordance with NEC.
6. Do not remove the plugs for the motor and
main supply while the frequency converter is
connected to mains. Check that the mains
supply has been disconnected and that the
necessary time has expired before removing
motor and mains plugs.
7. Please note that the frequency converter has
more voltage inputs than L1, L2 and L3, when
loadsharing (linking of DC intermediate cir-
cuit) and external 24 V DC have been instal-
led. Check that all voltage inputs have been
disconnected and that the necessary time
has passed before repair work is com-
menced.
MG.51.C5.22 - VLT is a registered Danfoss trademark.
®
VLT 5000 Series

Warning against unintended start

1. The motor can be brought to a stop by means
of digital commands, bus commands, refer-
ences or a local stop, while the adjustable
frequency drive is connected to the AC line.
These stop functions are NOT sufficient to
ensure that no unintended start occures and
should NOT be used for personal safety con-
siderations.
2. While parameters are being changed, the
motor may start. Consequently, the stop key
"Stop/Reset" must always be activated, fol-
lowing which data can be modified.
3. A motor that has been stopped may start if
faults occur in the electronics of the adjusta-
ble frequency drive, or if a temporary over-
load or a fault in the AC line supply or the
motor connection ceases.

Installation of mechanical brake

Do not connect a mechanical brake to the output from
the frequency converter before the relevant parame-
ters for brake control are parameterised.
(Selection of output in parameter 319, 321, 323 or 326
and cut-in current and frequency in parameter 223 and
225).
Use on isolated AC line
See section RFI Switch regarding use on isolated AC
line.
It is important to follow the recommendations regard-
ing installation on IT line, since sufficient protection of
the complete installation must be observed. Not taking
care using relevant monitoring devices for IT line sup-
ply may result in damage.
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