Danfoss VLT FC 100 Series Programming Manual page 123

Parameter Description
It may be preferable to run the pump at reduced speed for
a while in case it is not possible to run continuously at
demanded capacity.
3 3
Select Function at Inverter Overload, 14-61 Function at
Inverter Overload to automatically reduce pump speed until
the output current is below 100% of the rated current (set
in 14-62 Inv. Overload Derate Current).
The Function at Inverter Overload is an alternative to letting
the Adjustable frequency drive trip.
The Adjustable frequency drive estimates the load on the
power section by means of an inverter load counter, which
will cause a warning at 98% and a reset of the warning at
90%. At the value 100%, the Adjustable frequency drive
trips and provides an alarm.
Status for the counter can be read in 16-35 Inverter
Thermal.
If 14-61 Function at Inverter Overload is set to Derate, the
pump speed will be reduced when the counter exceeds
98, and stay reduced until the counter has dropped below
90.7.
If 14-62 Inv. Overload Derate Current is set to 95%, for
example, a steady overload will cause the pump speed to
fluctuate between values corresponding to 110% and 95%
of rated output current for the Adjustable frequency drive.
14-61 Function at Inverter Overload
Option:
Is used in case of steady overload beyond the
thermal limits (110% for 60 sec.).
[0] Trip Choose Trip [0] to make the Adjustable frequency
*
drive trip and provide an alarm.
[1] Derate Derate [1] to reduce pump speed in order to
decrease the load on the power section and
allowing this to cool down.
14-62 Inv. Overload Derate Current
Range:
95 %
*
3-96
Function:
Function:
[50 - 100 %]
MG11CD22 - VLT
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