9.11 Sine-wave Filters
When a motor is controlled by an adjustable frequency
drive, resonance noise is heard from the motor. This noise,
which results from the motor design, arises every time an
inverter switch in the adjustable frequency drive is
activated. The frequency of the resonance noise thus
corresponds to the switching frequency of the adjustable
frequency drive.
For the FC 300, Danfoss can supply a sine-wave filter to
dampen the acoustic motor noise. The filter reduces the
ramp-up time of the voltage, the peak load voltage U
PEAK
,
and the ripple current
Δ
I to the motor. This results in the
current and voltage becoming almost sinusoidal, which
reduces the acoustic motor noise.
The ripple current in the sine-wave filter coils also causes
some noise. This problem can be solved integrating the
filter in a cabinet or similar enclosure.
9.12 High Power Options
Ordering numbers for high power options can be found in
9.12.1 Frame Size D Options
9.12.1.1 Load Share Terminals
Load share terminals enable the connection of the DC
circuits of several adjustable frequency drives. Load share
terminals are available in IP20 adjustable frequency drives
and extend out the top of the unit. A terminal cover,
supplied with the adjustable frequency drive, must be
installed to maintain the IP20 rating of the enclosure.
shows both the covered and uncovered
terminals.
130BC547.10
Figure 9.21 Load Share or Regeneration Terminal with Cover
(Left) and without Cover (Right)
9.12.1.2 Regeneration Terminals
Regen (regeneration) terminals can be supplied for
applications that have a regenerative load. A regenerative
unit, supplied by a third party, connects to the regen
terminals so that power can be sent back onto line power,
resulting in energy savings. Regen terminals are available
in IP20 adjustable frequency drives and extend out the top
of the unit. A terminal cover, supplied with the adjustable
frequency drive, must be installed to maintain the IP20
rating of the enclosure.
shows both the covered
and uncovered terminals.
9.12.1.3 Anti-condensation Heater
An anti-condensation heater can be installed inside the
adjustable frequency drive to prevent condensation from
forming inside the enclosure when the unit is turned off.
The heater is controlled by customer-supplied 230 V AC.
For best results, operate the heater only when the unit is
not running.
A 2.5 amp time-delay fuse, such as the Bussmann
LPJ-21/2SP, is recommended to protect the heater.
9.12.1.4 Brake Chopper
A brake chopper can be supplied for applications that
have a regenerative load. The brake chopper connects to a
brake resistor, which consumes the braking energy and
prevents an overvoltage fault on the DC bus. The brake
chopper is automatically activated when the DC bus
voltage exceeds a specified level, depending on the
nominal voltage of the adjustable frequency drive.
9.12.1.5 Line Power Shield
The line power shield is a Lexan cover installed inside the
enclosure to provide protection according to VBG-4
accident-prevention requirements.
9.12.1.6 Ruggedized Printed Circuit Boards
Ruggedized boards are available for marine and other
applications that experience higher than average vibration.
NOTICE!
Ruggedized boards are required to meet marine
approval requirements.
Options and Accessories
Design Guide
264
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
MG34S222
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Содержание VLT AutomationDrive FC 300
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