Danfoss VLT Series Programming Manual page 113

Parameter Description
3.14.5 14-5* Environment
These parameters help the frequency converter to operate
under special environmental conditions.
14-50 RFI Filter
3 3
This parameter is only available for . It is not relevant to due to
different design and shorter motor cables.
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.
14-51 DC Link Compensation
Option:
[0] Off
[1] On
*
14-52 Fan Control
Option:
[0] Auto
*
[1] On 50%
[2] On 75%
[3] On 100%
14-53 Fan Monitor
Option:
[0] Disabled
[1] Warning
*
112
VLT
Function:
Disables DC Link Compensation.
Enables DC Link Compensation.
Function:
Select the minimum speed of the main fan.
Select Auto [0] to run the fan only when the
internal temperature of the frequency converter
is in the range +35°C to approximately +55°C.
The fan will run at low speed at +35°C and at
full speed at approximately +55°C.
Function:
Select which reaction the frequency converter
should take in case a fan fault is detected.
MG.11.CC.02 - VLT
®
HVAC Drive Programming Guide
14-53 Fan Monitor
Option:
[2] Trip
14-55 Output Filter
Option:
[0] No Filter
*
[2] Sine Wave Filter Fixed
14-59 Actual Number of Inverter Units
Range:
Size related
*
3.14.6 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
3.14.7 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 will need a current higher than the rated
current of the frequency converter. The frequency
converter can yield 110% of the rated current continuously
for 60 sec. If still overloaded, the frequency converter will
normally trip (causing the pump to stop by coasting) and
provide an alarm.
®
is a registered Danfoss trademark
Function:
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 will be activated. If the temperature
increases further, select whether the frequency
converter should trip (trip locked) or derate the
output current.
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.
current will be reduced until the allowable
temperature has been reached.
Function: