Danfoss VLT AutomationDrive FC 301 Programming Manual page 140

Parameter Descriptions
3.15.7 14-5* Environment
These parameters help the frequency converter to operate
under special environmental conditions.
14-50 RFI Filter
3 3
This parameter is available for FC 302 only. It is not relevant to
FC 301 due to different design and shorter motor cables.
Option: Function:
[0] Off Select [0] Off if the frequency converter is fed by an
isolated mains source (IT mains).
If a filter is used, select [0] Off during charging to
prevent a high leakage current making the RCD switch.
In this mode, the internal RFI filter capacitors between
chassis and the mains RFI filter circuit are cut-out to
reduce the ground capacity currents.
[1] On Select [1] On to ensure that the frequency converter
complies with EMC standards.
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
*
138
Function:
Select [0] Auto to run fan only when internal
temperature in frequency converter is in range 35
°C to approx. 55 °C.
®
VLT AutomationDrive FC 301/302 Programming Guide
14-52 Fan Control
Select minimum speed of the main fan.
Option:
[1] On
50%
[2] On
75%
[3] On
100%
[4] Auto
(Low
temp
env.)
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
MG33MH02 - Rev. 2013-09-30
Function:
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
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 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 is
operated within the safe range of switching