Danfoss VLT 3006 Product Manual page 12

Programmable
control inputs and
signal outputs
in 4 setups
Protected against mains
disturbance
Low disturbance on
the mains
Effective radio
frequency interference
suppression (EMC)
Long motor cables
Advanced
VLT protection
®
Galvanic isolation
Advanced
motor protection
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Technology
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.
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.
As the VLT 3000 Series has coils in the
®
intermediate circuit built-in as standard the
harmonic generation is low.
The VLT 3000 Series can be delivered with
®
an RFI filter complying with EN 55011.
Filters are available as options or modules.
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.
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).
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.
®
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.
Rated motor voltage and full torque can be
maintained down to 10% undervoltage on
the supply mains.
This gives a good power factor, thus
reducing the harmonic load on the mains
supply.
Some VLT types have a mains filter as
®
standard in compliance with grade 1, class A.
cable between motor and frequency
converter without any additional coils.
The effective monitoring of the three supply
®
phases means that the VLT
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 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).
3000 Series
®
11