11
MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
It is easy for the user to program the
required functions on the keyboard of the
VLT
®
3000 Series or via the terminals or
the RS 485 interface.
The digital technique used in the
VLT
®
3000 Series makes it possible to program
the different control inputs and signal
outputs, and to select 4 different user-
defined setups.
Programmable
control inputs and
signal outputs
in 4 setups
Protected against mains
disturbance
The
VLT
®
3000 Series is protected against
transients arising on the mains, e.g. when
you switch in power factor phase correction
capacitors or when the supply is subject to
lightning strikes.
Rated motor voltage and full torque can be
maintained down to 10% undervoltage on
the supply mains.
Low disturbance on
the mains
As the
VLT
®
3000 Series has coils in the
intermediate circuit built-in as standard the
harmonic generation is low.
This gives a good power factor, thus
reducing the harmonic load on the mains
supply.
Effective radio
frequency interference
suppression (EMC)
Technology
As standard the
VLT
®
3000 Series is
delivered with built-in motor coils. This
means that it is possible to install a long
Current measurement in all three motor
phases gives perfect protection of the VLT
®
3000 series in the event of short circuits or
earth faults on the motor terminals.
The continuous monitoring of the three
motor phases makes switching on the
motor cables possible e.g. by opening/
closing a contactor.
Long motor cables
Advanced
VLT
®
protection
cable between motor and frequency
converter without any additional coils.
Galvanic isolation
With the
VLT
®
3000 Series safety isolation
is standard, as the high-voltage parts of
the power section are galvanically isolated
from the low-voltage parts of the control
section in accordance with VDE 0160/0106
(PELV).
Advanced
motor protection
The
VLT
®
3000 Series has a built-in electro-
nic thermal motor protection.
The frequency converter calculates the
motor temperature on the basis of voltage,
current, frequency and time.
Therefore it is superior to the traditional
bi-metallic protection where the altered
cooling conditions due to the speed control
are not taken into consideration.
The thermal motor protection is compar-
able with thermal relay in the motor cables.
To achieve optimum protection against
overheating of the motor when covered or
blocked, or in case the ventilation should
fail, it is possible to build in a thermistor
and connect this to the frequency con-
verter thermistor input (terminal 16, see
page 102).
The effective monitoring of the three supply
phases means that the
VLT
®
3000 Series
stops in the event of a missing phase. In
this way overloading of the inverter and the
capacitors of the intermediate circuit, which
would reduce the lifetime of the frequency
converter drastically, can be avoided.
The
VLT
®
3000 Series has built-in thermal
protection of the unit as standard. The
function turns off the inverter on thermal
overload.
The VLT
®
3000 Series can be delivered with
an RFI filter complying with EN 55011.
Filters are available as options or modules.
Some VLT
®
types have a mains filter as
standard in compliance with grade 1, class A.
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