10.14 Sine-wave Filters
When a motor is controlled by an adjustable frequency drive, resonance noise will be heard from the motor. This noise, which is the result of the design
of the motor, 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 AutomationDrive 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, which means that current and
voltage become almost sinusoidal. The acoustic motor noise is thus reduced to a minimum.
The ripple current in the sine-wave filter coils will also cause some noise. Solve the problem by integrating the filter in a cabinet or similar.
10.15 High Power Options
Ordering numbers for High Power options can be found in the
How to
Order
section. The kits are described in the FC 300 High Power Instruction
Manual,
MG33UXYY
.
10.15.1 Frame Size F Panel Options
Space Heaters and Thermostat
Mounted on the cabinet interior of frame size F adjustable frequency drives, space heaters controlled via automatic thermostat help control humidity
inside the enclosure, extending the lifetime of drive components in damp environments. The thermostat default settings turn on the heaters at 10
°
C
(50
°
F) and turn them off at 15.6
°
C (60
°
F).
Cabinet Light with Power Outlet
A light mounted on the cabinet interior of frame size F adjustable frequency drives increase visibility during servicing and maintenance. The housing light
includes a power outlet for temporarily powering tools or other devices, available in two voltages:
•
230 V, 50 Hz, 2.5 A, CE/ENEC
•
120 V, 60 Hz, 5 A, UL/cUL
Transformer Tap Set-up
If the Cabinet Light & Outlet and/or the Space Heaters & Thermostat are installed Transformer T1 requires it taps to be set to the proper input voltage.
A 380–480/500 V380–480 V drive will initially be set to the 525 V tap and a 525–690 V drive will be set to the 690 V tap to insure no overvoltage of
secondary equipment occurs if the tap is not changed prior to power being applied. See the table below to set the proper tap at terminal T1 located in
the rectifier cabinet. For location in the drive, see figure of rectifier in the
Power Connections
section.
Input Voltage Range
Tap to Select
380–440 V
400V
441–490 V
460V
491–550 V
525V
551–625 V
575V
626–660 V
660V
661–690 V
690V
NAMUR Terminals
NAMUR is an international association of automation technology users in process industries, primarily in the chemical and pharmaceutical industries, in
Germany. Selection of this option provides terminals organized and labeled to the specifications of the NAMUR standard for drive input and output
terminals. This requires MCB 112 PTC Thermistor Card and MCB 113 Extended Relay Card.
10 Options and Accessories
FC 300 Design Guide
10-24
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
10