Danfoss VLT AutomationDrive FC 302 Programming Manual page 152

Parameter Descriptions
3 3
Illustration 3.59 RFI Filter
14-51 DC Link Compensation
Option: Function:
The rectified AC-DC voltage at the frequency
converter's DC link is associated with voltage ripples.
These ripples can increase in magnitude with increased
load. These ripples are undesirable because they can
generate current and torque ripples. A compensation
method is used to reduce these voltage ripples at DC
link. In general, DC link compensation is recommended
for most applications, but care must be taken when
operating in field weakening as it can generate speed
oscillations at the motor shaft. In field weakening, it is
recommended to turn DC link compensation off.
[0] Off Disables DC Link Compensation.
[1] On Enables DC Link Compensation.
14-52 Fan Control
Select minimum speed of the main fan.
Option:
[0] Auto
*
[1] On 50%
[2] On 75%
[3] On
100%
[4] Auto
(Low
temp
env.)
150
VLT
Function:
Select [0] Auto to run fan only when internal
temperature in frequency converter is in range
35 °C to approx. 55 °C.
Fan runs at low speed below 35 °C, and at full
speed at approx. 55 °C.
The fan always runs at 50% speed or above. The
fan runs at 50% speed at 35 °C, and at full speed
at approx. 55 °C.
The fan always runs at 75% speed or above. The
fan runs at 75% speed at 35 °C, and at full speed
at approx. 55 °C.
The fan runs at 100% speed always.
This selection is the same as [0] Auto but with
special considerations around and below 0°C. In
selection [0] Auto there is a risk that the fan
starts running around 0 °C as the frequency
converter detects a sensor fault and thus protect
the frequency converter while reporting warning
66 "Heatsink Temperature Low". Selection [4]
Auto (Low temp env.) can be used in very cold
®
AutomationDrive FC 301/302 Programming Guide
14-52 Fan Control
Select minimum speed of the main fan.
Option:
14-53 Fan Monitor
Option:
[0] Disabled
[1] Warning
[2] Trip
14-55 Output Filter
Option:
[0] No
Filter
*
[1] Sine-
Wave
Filter
[2] Sine-
Wave
Filter
Fixed
MG33MI02 - Rev. 2013-11-20
Function:
environments and prevent the negative effects of
this further cooling and avoid warning 66.
Function:
Select which reaction the frequency converter
should take in case a fan fault is detected.
Function:
NOTICE
This parameter cannot be adjusted while
motor is running.
Select the type of output filter connected.
This is the default setting and should be used with
dU/dt filters or high-frequency common-mode (HF-
CM) filters.
This setting is only for backwards compatibility. It
enables operation with FLUX control principle when
the parameters parameter 14-56 Capacitance Output
Filter and parameter 14-57 Inductance Output Filter
are programmed with the output filter capacitance
and inductance. It DOES NOT limit the range of the
switching frequency.
This parameter sets a minimum allowed limit to the
switching frequency and ensures that the filter is
operated within the safe range of switching
frequencies. Operation is possible with all control
principles. For FLUX control principle the parameters
parameter 14-56 Capacitance Output Filter and
parameter 14-57 Inductance Output Filter have to be
programmed (these parameters have no effect in
plus
VVC and U/f). The modulation pattern is set to
SFAVM which gives the lowest acoustic noise in the
filter.
Note:
Reset the frequency converter after selecting [2]
Sine-Wafe Filter Fixed.
CAUTION
Always set parameter 14-55 Output Filter to
[2] Sine-wave fixed when using a sine-wave
filter. Failure to do so can result in
overheating of the frequency converter,
which can result in personal injury and
equipment damage.