Danfoss VLT HVAC Drive FC 102 Programming Manual page 124

Parameter Descriptions
14-50 RFI Filter
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
3 3
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 3.42 RFI Filter
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
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, it is recommended
to turn off DC-link compensation.
[0] Off Disables DC-link compensation.
[1] On Enables DC-link compensation.
14-52 Fan Control
Option:
[0] Auto
*
[1] On 50%
[2] On 75%
[3] On 100%
122
®
VLT
Function:
Select the minimum speed of the main fan.
Select [0] Auto to run the fan only when the
internal temperature of the frequency
converter is in the range +35 °C to approxi-
mately +55 °C. The fan runs at low speed at
+35 °C and at full speed at approximately
+55 °C.
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HVAC Drive FC 102
14-52 Fan Control
Option:
[4] Auto (Low
temp env.)
14-53 Fan Monitor
Option:
[0] Disabled
[1] Warning
*
[2] Trip
14-55 Output Filter
Option:
[0] No Filter
*
[2] Sine Wave Filter Fixed
14-59 Actual Number of Inverter Units
This parameter is only relevant for high power frequency
converters.
Range:
Size related
*
3.14.7 14-6* Auto Derate
This group contains parameters for derating the frequency
converter in case of high temperature.
14-60 Function at Over Temperature
Option:
[0] Trip
*
[1] Derate If the critical temperature is exceeded, the output
3.14.8 No Trip at Inverter Overload
In some pump systems, the frequency converter has not
been sized properly to yield the current needed in all
points of the operational flow-head characteristic. At these
points, the pump needs a current higher than the rated
current of the frequency converter. The frequency
converter can yield 110% of the rated current continuously
Function:
Function:
Select the frequency converter action if a fan
fault is detected.
Function:
[ 1 - 1 ] Sets the actual number of operating
inverter units.
Function:
If either heatsink or control card temperature
exceeds a factory-programmed temperature limit, a
warning is activated. If the temperature increases
further, select whether the frequency converter
should trip (trip lock) or derate the output current.
The frequency converter trips (trip lock) and
generate an alarm. Cycle Power to reset the alarm.
The motor restarts when the heat sink temperature
has dropped below the alarm limit.
current is reduced until the allowable temperature
has been reached.
Function:
MG11CE02