VLT
®
4000 VT
The voltage of the adjustable frequency
drive is dangerous whenever the equipment
is connected to line. Incorrect installation
of the motor or the AFD may cause damage to the
equipment, serious personal injury or death.
Consequently, the instructions in this manual,
as well as national and local rules and safety
regulations, must be complied with.
â– Safety regulations
1. The VLT AFD must be disconnected from the
line if repair work is to be carried out.
Check that the line supply has been disconnected
and that the necessary time has passed before
removing motor and line plugs.
2. The [OFF/STOP] key on the control panel of the VLT
AFD does not disconnect the equipment from line
and is thusn
ot to be used as a safety switch.
3. Correct protective grounding 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 the
National Electrical Code and local codes.
4. The ground leakage currents are higher than 3.5mA.
5. Protection against motor overload is n
ot included in
the factory setting. If this function is required, set
parameter 117, Motor thermal protection,todata
value ETR trip or data value ETR warning.
N
ote: The function is initialised at 1.0 x rated motor
current and rated motor frequency (see parameter
117, Motor thermal protection). In UL/cUL
applications ETR provides Class 20, over-load
protection in accordance with the NEC
®
.
6. Do n
ot remove the plugs for the motor and
line supply while the VLT AFD is connected to line.
Check that the line supply has been disconnected
and that the necessary time has passed before
removing motor and line plugs.
7. Reliable galvanic isolation (PELV) is not complied
with if the RFI switch is placed in OFF position.
This means that all control in- and outputs
can only be considered low-voltage terminals
with basic galvanic isolation.
8. Please note that the VLT AFD has more voltage
inputs than L1, L2, L3 when the DC-bus terminals
or AUX 24 V option are used.
Check that a
ll voltage inputs have been
disconnected and that the necessary time has
passed before repair work is commenced.
â– Warning against unintended star t
1. The motor can be brought to a stop by means of
digital commands, bus commands, references or
a local stop, while the AFD is connected to line. If
personal safety considerations make it necessary
to ensure that no unintended start occurs, t
hese
stop functions are not sufficient.
2. While parameters are being changed, the motor
may start. Consequently, t
he stop key [OFF/
STOP] must always be activated, following
which data can be modified.
3. A stopped motor may start if a fault occurs in
the electronics of the VLT AFD, or if a temporary
overload or a fault in the supply line or the
motor connection ceases.
175ZA713.13
Warning:
Touching the electrical parts may be fatal - even after the equipment has
been disconnected from line.
Using VLT: wait at least 20 minutes for 200 and 400 V units
wait at least 30 minutes for 525-600 V units
Using VLT 4452-4652, 380-460 V: Wait at least 40 minutes!
MG.40.A7.22 - VLT is a registered Danfoss trademark
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