The voltage of the frequency converter is
dangerous whenever the equipment is
connected to mains. Incorrect installation
of the motor or the frequency converter
may cause damage to the equipment, se-
rious personal injury or death.
Consequently, the instructions in this
manual, as well as national and local rules
and safety regulations, must be complied
with.
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 [OFF/STOP] key on the control panel of
the 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 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 included
in the factory setting. Parameter 117, Motor
thermal protection default value is ETR trip 1.
Note: The function is initialised at 1.0 x rated
motor current and rated motor frequency
(see parameter 117, Motor thermal protec-
tion).
6. Do
not remove the plugs for the motor and
mains supply while the 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 only be considered low-volt-
age terminals with basic galvanic isolation.
8. Please note that the frequency converter has
more voltage inputs than L1, L2 and L3, when
the DC-bus terminals are used.
Check that
all voltage inputs have been dis-
connected and that the necessary time has
passed before repair work is commenced.
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 frequency
converter is connected to mains.
If personal safety considerations make it nec-
essary 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
[OFF/STOP] 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 frequen-
cy converter, or if a temporary overload or a
fault in the supply mains or the motor con-
nection ceases.
VLT
®
6000 HVAC Series
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 5
Introduction to HVAC
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