Brake Resistors; Lcp Panel Mounting Kit; Sine-Wave Filters - Danfoss VLT AutomationDrive FC 300 Design Manual

Options and Accessories

9.9 Brake Resistors

In applications where the motor is used as a brake, energy
is generated in the motor and sent back into the
frequency converter. If the energy cannot be transported
back to the motor, it increases the voltage in the converter
DC line. In applications with frequent braking and/or high
inertia loads, this voltage increase may lead to an over
voltage trip in the converter and possibly a shut down.
Brake resistors are used to dissipate the excess energy
from the regenerative braking. The resistor is selected in
respect to its ohmic value, its power dissipation rate, and
its physical size. Danfoss offers a wide variety of different
resistors that are specially designed to our frequency
converters. For the dimensioning of brake resistors, see
3.8.3 Selection of Brake Resistor .Code numbers can be
found in 5 How to Order.

9.10 LCP Panel Mounting Kit

The LCP can be moved to the front of a cabinet by using
the remote built-in kit. The fastening screws must be
tightened with a torque of max. 1 Nm.
Enclosure
Max. cable length between and unit
Communication std
Table 9.5 Technical Data for Mounting an LCP to the IP66
Enclosure
64,5± 0.5 mm
(2.54± 0.04 in)
Panel
cut out
Illustration 9.18 Dimensions
®
VLT AutomationDrive FC 300 Design Guide 90-1200 kW
Illustration 9.19 Ordering No. 130B1113, LCP Kit with
Graphical LCP, Fasteners, 3 m Cable and Gasket
IP66 front
3 m
RS-485
Illustration 9.20 Ordering No. 130B1114, LCP Kit with
Numerical LCP, Fasteners and Gasket
Also available is an LCP Kit without LCP. For IP66 units, the
ordering number is 130B1117. Use ordering number
130B1129 for IP55 units.

9.11 Sine-wave Filters

When a motor is controlled by a frequency converter,
resonance noise is heard from the motor. This noise, which
results from the motor design, 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
MG34S202 - Rev. 2013-08-19
9 9
,
PEAK
237