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
Inverter Thermal.
If par.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 par.14-62
Inv. Overload Derate Current is set e.g. to 95% a steady overload will cause the pump speed to
fluctuate between values corresponding to 110% and 95% of rated output current for the frequency converter.
14-61 Function at Inverter Overload
Option: Function:
Is used in case of steady overload beyond the thermal limits (110% for
60 sec.).
[0] * Trip Choose Trip [0] to make the frequency converter 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: Function:
95 %* [50 - 100 %] 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.).
Parameter Description
160 TR200 Programming Guide
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