Dc-Link Compensation; Fan Control/Fan Monitor; Output Filter; Capacitance Output Filter - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions

14-51 DC-Link Compensation

Option: Function:
The rectified AC-DC voltage in 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 in the DC link. In
general, DC-link compensation is recommended for
most applications, but pay attention when operating in
field weakening as it can generate speed oscillations at
the motor shaft. In field weakening, turn off DC-link
compensation.
[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.)
14-53 Fan Monitor
Option:
[0] Disabled
[1] Warning
*
[2] Trip
198
VLT
Function:
Select [0] Auto to run fan only when internal
temperature in frequency converter is in range
35 °C (95 °F) to approximately 55 °C (131 °F).
Fan runs at low speed below 35 °C (95 °F), and
at full speed at approximately 55 °C (131 °F).
The fan always runs at 50% speed or above. The
fan runs at 50% speed at 35 °C (95 °F), and at
full speed at approximately 55 °C (131 °F).
The fan always runs at 75% speed or above. The
fan runs at 75% speed at 35 °C (95 °F), and at
full speed at approximately 55 °C (131 °F).
The fan always runs at 100% speed.
This option is the same as [0] Auto, but with
special considerations around and below 0 °C
(32 °F). In option [0] Auto there is a risk that the
fan starts running around 0 °C as the frequency
converter detects a sensor fault and thus
protects the frequency converter while reporting
warning 66, Heat sink Temperature Low. Option [4]
Auto (Low temp env.) can be used in very cold
environments and prevents the negative effects
of this further cooling and avoids warning 66,
Heat sink Temperature Low.
Function:
Select the frequency converter action if a fan
fault is detected.
Danfoss A/S © 10/2018 All rights reserved.
®
AutomationDrive FC 301/302

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 2 phases when capacitance is delta
connection).
Range:
Size related
*
Function:
NOTICE
This parameter cannot be adjusted while the
motor is running.
NOTICE
Reset the frequency converter after selecting
[2] Sine-Wave Filter Fixed.
CAUTION
OVERHEATING OF FREQUENCY
CONVERTER
When using sine-wave filters, there is a risk
of overheating of the frequency converter,
which can result in personal injury and
equipment damage.
Always set parameter 14-55 Output Filter to
[2] Sine-wave fixed when using a sine-wave
filter.
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
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, program
parameter 14-56 Capacitance Output Filter and
parameter 14-57 Inductance Output Filter (these
parameters have no effect in VVC
modulation pattern is set to SFAVM, which gives the
lowest acoustic noise in the filter.
Function:
[0.1 - 6500 Set the capacitance of the output
uF] filter. The value can be found on the
filter label.
+
and U/f ). The
MG33MP02