Cascade Controller Option
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.
NB!:
Using the VLT Dialog Software or the
FC protocol for serial communication can
cause unintended behaviour of motors
and plant and must be avoided.
■
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.
NB!:
The IMMEDIATE STOP function will release all
slave relays and can not be used as a safety
switch. The SEQUENCED STOP will stage off
the slave relays and can not 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 included
in the factory setting. Parameter 117, Motor
thermal protection, default value is ETR trip
1. For the North American market: The ETR
functions ensure overload protection of the motor,
Class 20, in accordance with NEC.
NB!:
Motor Thermal Protection is initialised at 1.0 x
rated motor current and rated motor frequency
(see parameter 117,
Motor thermal protection
).
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 only be considered low-voltage terminals
with basic galvanic isolation.
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.
■
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, after
which data can be modified.
MG.60.I3.02 - VLT is a registered Danfoss trademark
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