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VLT Automation VT Drive FC322
Programming Guide
2.13.9 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.
It may be preferable to run the pump at reduced speed for a while in case it is not possible to run continuously with demanded capacity.
Select
Function at Inverter Overload
100% of the rated current (set in par. 14-62
The
Function at Inverter Overload
The frequency converter 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 frequency converter trips and provides an alarm.
Status for the counter can be read in par. 16-35
Function at Inverter Overload
If par. 14-61
counter has dropped below 90.7.
Inv. Overload Derate Current
If par. 14-62
110% and 95% of rated output current for the frequency converter.
14-61 Function at Inverter Overload
Option:
[0]
Trip
[1] *
Derate
14-62 Inv. Overload Derate Current
Range:
95 %*
[50 - 100 %]
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, par. 14-61
Function at Inverter Overload
Inv. Overload Derate Current
).
is an alternative to letting the frequency converter trip.
Inverter Thermal
.
is set to Derate, the pump speed will be reduced when the counter exceeds 98, and stay reduced until the
is set e.g. to 95% a steady overload will cause the pump speed to fluctuate between values corresponding to
Function:
Is used in case of steady overload beyond the thermal limits (110% for 60 sec.).
Trip
Choose
[0] to make the frequency converter trip and provide an alarm or
pump speed in order to decrease the load on the power section and allowing this to cool down.
Function:
Defines the desired current level (in % of rated output current for the frequency converter) when
running with reduced pump speed after load on the frequency converter has exceeded the allowable
limit (110% for 60 sec.).
MG.20.W1.22 - VLT is a registered Danfoss trademark
to automatically reduce pump speed until the output current is below
2 Parameter Description
2
Derate
[1] to reduce
165
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