VLT
®
6000 HVAC
MG.60.B1.02 - VLT is a registered Danfoss trademark
4
Warning:
Touching the electrical parts may be fatal - even after the
equipment has been disconnected from mains.
Using VLT 6001-6005: wait at least 4 minutes
Using VLT 6006-6275: wait at least 15 minutes
The voltage of the frequency converter
is dangerous whenever the equipment
is connected to mains. Incorrect instal-
lation of the motor or the frequency converter 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.
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Safety regulations
1. The VLT frequency converter must be discon-
nected 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 [OFF/STOP] key on the control panel of the
VLT frequency converter 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 not included
in the factory setting. If this function is required,
set parameter 117,
Motor thermal protection
, to
data value ETR trip or data value ETR warning.
Note: The function is initialised at 1.0 x rated
motor current and rated motor frequency (see
page 87).
For the North American market: The ETR
functions ensure overload protection of the motor,
Class 20, in accordance with NEC.
6. Do not remove the plugs for the motor and mains
supply while the VLT 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. 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 no
longer be considered low-voltage terminals.
8. Please note that the VLT frequency converter has
more voltage inputs than L1, L2, L3 when the DC-
bus terminals are used.
Check that all voltage inputs have been
disconnected and that the necessary time has
passed before repair work is commenced.
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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 [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 frequency converter, or if a
temporary overload or a fault in the supply mains
or the motor connection ceases.
