Danfoss ADAP-KOOL Drive Programming Manual page 124

3 Parameter Description
3.11.8 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:
3
[0] * Trip
[1] Derate
3.11.9 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.
Function at Inverter Overload
Select
of the rated current (set in par.14-62
Function at Inverter Overload
The
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.
124
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 con-
verter 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.
If the critical temperature is exceeded the output current will be reduced until the allowable tem-
perature has been reached.
Function at Inverter Overload
, par.14-61
Inv. Overload Derate Current
).
is an alternative to letting the frequency converter trip.
MG.11.N1.02 - VLT
ADAP-KOOL
to automatically reduce pump speed until the output current is below 100%
® is a registered Danfoss trademark
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Drive Programming Guide