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10.13 Sine-wave Filters
When a motor is controlled by a frequency converter,
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 frequency converter is
activated. The frequency of the resonance noise thus
corresponds to the switching frequency of the frequency
converter.
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, which means that current and voltage become
almost sinusoidal. Consequently, the acoustic motor noise
is 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.
10.14 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 Operating Instructions,
MG.33.UX.YY
.
10.14.1 Frame Size F Options
Space Heaters and Thermostat
Mounted on the cabinet interior of frame size F frequency
converters, 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
frequency converters increase visibility during servicing
and maintenance. The housing the light includes a power
outlet for temporarily powering tools or other devices,
available in two voltages:
•
230V, 50Hz, 2.5A, CE/ENEC
•
120V, 60Hz, 5A, UL/cUL
Transformer Tap Setup
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/ 500V drive
will initially be set to the 525V tap and a 525-690V drive
will be set to the 690V tap to insure no over-voltage 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 illustration of rectifier
in
.
Input Voltage Range
Tap to Select
380V-440V
400V
441V-490V
460V
491V-550V
525V
551V-625V
575V
626V-660V
660V
661V-690V
690V
NAMUR Terminals
NAMUR is an international association of automation
technology users in the process industries, primarily
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.
RCD (Residual Current Device)
Uses the core balance method to monitor ground fault
currents in grounded and high-resistance grounded
systems (TN and TT systems in IEC terminology). There is a
pre-warning (50% of main alarm set-point) and a main
alarm set-point. Associated with each set-point is an SPDT
alarm relay for external use. Requires an external “window-
type” current transformer (supplied and installed by
customer).
•
Integrated into the drive’s safe-stop circuit
•
IEC 60755 Type B device monitors AC, pulsed DC,
and pure DC ground fault currents
•
LED bar graph indicator of the ground fault
current level from 10–100% of the set-point
•
Fault memory
•
TEST / RESET button
Insulation Resistance Monitor (IRM)
Monitors the insulation resistance in ungrounded systems
(IT systems in IEC terminology) between the system phase
conductors and ground. There is an ohmic pre-warning
and a main alarm set-point for the insulation level.
Associated with each set-point is an SPDT alarm relay for
external use. Note: only one insulation resistance monitor
can be connected to each ungrounded (IT) system.
•
Integrated into the drive’s safe-stop circuit
•
LCD display of the ohmic value of the insulation
resistance
•
Fault Memory
•
INFO, TEST, and RESET buttons
IEC Emergency Stop with Pilz Safety Relay
Includes a redundant 4-wire emergency-stop push-button
mounted on the front of the enclosure and a Pilz relay that
monitors it in conjunction with the drive’s safe-stop circuit
and the mains contactor located in the options cabinet.
Options and Accessories
FC 300 Design Guide
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
253
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