Danfoss VLT AutomationDrive FC 300 Programming Manual page 144

Parameter Descriptions
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
3 3
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% The fan will run at 100% speed always.
[4] Auto
(Low
temp
env.)
14-53 Fan Monitor
Option:
[0] Disabled
[1] Warning
[2] Trip
142
Function:
Select [0] Auto to run fan only when internal
temperature in frequency converter is in range 35
°C to approx. 55 °C.
Fan will run at low speed below 35 °C, and at full
speed at approx. 55 °C.
The fan will always run at 50% speed or above.
The fan will run at 50% speed at 35 °C, and at full
speed at approx. 55 °C.
The fan will always run at 75% speed or above.
The fan will run at 75% speed at 35 °C, and at full
speed at approx. 55 °C.
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 will
start running around 0°C as the frequency
converter will fear 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
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.
MG33MG02 - VLT
®
VLT AutomationDrive Programming Guide
14-55 Output Filter
Option:
[0] No
Filter
[1] Sine-
Wave
Filter
[2] Sine-
Wave
Filter
Fixed
14-56 Capacitance Output Filter
Compensation function of the LC-filter requires the per phase
equivalent star connected capacitance of the filter (3 times the
capacity between two phases when capacitance is 'Delta'
connection).
Range:
Size related
14-57 Inductance Output Filter
Range:
Size related
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is a registered Danfoss trademark
Function:
NOTE
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 14-56 Capacitance Output Filter and
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 will
be operated within the safe range of switching
frequencies. Operation is possible with all control
principles. For FLUX control principle the
parameters 14-56 Capacitance Output Filter and
14-57 Inductance Output Filter have to be
programmed (these parameters have no effect in
VVC plus and U/f). The modulation pattern will be set
to SFAVM which gives the lowest acoustic noise in
the filter. Always set 14-55 Output Filter to [2] Sine-
wave fixed when using a sine-wave filter.
Function:
[0.1 - 6500 uF] Set the capacitance of the output
*
filter. The value can be found on
the filter label.
NOTE
This is required for correct
compensation in Flux mode
(1-01 Motor Control Principle)
Function:
[0.001 - 65 Set the inductance of the output
*
mH] filter. The value can be found on the
filter label.