Technical information

3.14.5 14-5* Environment
These parameters help the frequency converter to operate
under special environmental conditions.
3.14.6 14-50 RFI Filter
14-50 RFI Filter
Option: Function:
[0] Off
Select Off [0] if the frequency converter is fed by an
isolated mains source (IT mains).
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 mains RFI filter circuit are cut-out to
reduce the ground capacity currents.
[1] * On
Select On [1] to ensure that the frequency converter
complies with EMC standards.
130BB908.10
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
Option: Function:
Select the minimum speed of the main fan.
[0] * Auto Select Auto [0] to run the fan only when the
internal temperature of the frequency
14-52 Fan Control
Option: Function:
converter is in the range +35°C to approxi-
mately +55°C. The fan will run at low speed
at +35°C and at full speed at approximately
+55°C.
[1] On 50%
[2] On 75%
[3] On 100%
[4] Auto (Low
temp env.)
14-53 Fan Monitor
Option: Function:
Select which reaction the frequency converter
should take in case a fan fault is detected.
[0] Disabled
[1] * Warning
[2] Trip
14-55 Output Filter
Option: Function:
[0] * No Filter
[2] Sine Wave Filter Fixed
14-59 Actual Number of Inverter Units
Range: Function:
Size related* [ 1 - 1. ] Sets the actual number of operating
inverter units.
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: Function:
If either heatsink or control card temperature
exceeds a factory-programmed temperature limit, a
warning will be activated. If the temperature
increases further, select whether the frequency
converter should trip (trip locked) or derate the
output current.
[0] * Trip The frequency converter will trip (trip locked) and
generate an alarm. Power must be cycled to reset
the alarm, but will not allow restart of the motor
until the heat sink temperature has dropped below
the alarm limit.
[1] Derate If the critical temperature is exceeded the output
current will be reduced until the allowable
temperature has been reached.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG11CD02 - VLT
®
is a registered Danfoss trademark 113
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