Environment; Rfi Filter; Fan Control; Capacitance Output Filter - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions

3.15.5 14-5* Environment

These parameters help the Adjustable frequency drive to
operate under special environmental conditions.

14-50 RFI Filter

This parameter is only available for FC 302. It is not relevant toFC
301 due to different design and shorter motor cables.
Option: Function:
[0] Off Select Off [0] if the Adjustable frequency drive is fed
by an isolated line power source (IT line power).
If a filter is used, select Off [0] during charging to
prevent a high leakage current making the RCD
switch.
In this mode, the internal RFI filter capacitors between
chassis and the line power RFI filter circuit are cut-out
to reduce the ground capacity currents.
[1] On Select On [1] to ensure that the Adjustable frequency
*
drive complies with EMC standards.
14-51 DC Link Compensation
Option: Function:
[0] Off Disables DC Link Compensation.
[1] On Enables DC Link Compensation.
*

14-52 Fan Control

Select minimum speed of the main fan.
Option: Function:
[0] Auto Select Auto [0] to run fan only when
*
internal temperature in Adjustable
frequency drive is in the range 95°F
[35°C] to approx. 131°F [55°C].
Fan runs at low speed below 95°F
[35°C], and at full speed at approx.
131°F [55°C].
[1] On 50%
[2] On 75%
[3] On 100%
[4] Auto (Low temp
env.)
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FC 300 Programming Guide
[0]
[1]
[2]
[0]
*
[1]
[2]
Application
dependent
®
MG33MD22 - VLT is a registered Danfoss trademark
14-53 Fan Monitor
Option: Function:
Select which reaction the Adjustable frequency
drive should take in case a fan fault is detected.
Disabled
Warning
*
Trip
14-55 Output Filter
Option: Function:
Select the type of output filter connected. This
parameter cannot be adjusted while motor is
running.
No This is the default setting and should be used with
Filter dU/dt filters or high frequency common mode (HF-
CM) filters.
Sine- This setting is only for backwards compatibility. It
Wave enables operation with FLUX control principle
Filter 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.
Sine- This parameter sets a minimum allowed limit to
Wave the switching frequency and ensures that the filter
Filter will be operated within the safe range of switching
Fixed frequencies. Operation is possible with all control
principles. For the 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 patter will be set
to SFAVM which gives the lowest acoustic noise in
the filter. Remember to always set 14-55 Output
Filter to sine-wave fixed when you use a sine-wave
filter.

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:
[0.1 - 6500.0
uF]
*
3
Function:
Set the capacitance of
the output filter. The
value can be found on
the filter label.
3-133
3