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: Function:
If either heatsink or control card temperature exceeds a factory-pro-
grammed temperature limit, a warning will be activated. If the tempera-
ture increases further, select whether the frequency converter should trip
(trip locked) or derate the output current.
[0] * Trip 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.
[1] Derate If the critical temperature is exceeded the output current will be reduced
until the allowable temperature has been reached.
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 continu-
ously 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
, par.14-61 Function at Inverter Overload to automatically reduce pump speed
until the output current is below 100% of the rated current (set in par.14-62
Inv. Overload Derate Current).
The
Function at Inverter Overload
is an alternative to letting the frequency converter trip.
Parameter Description
TR200 Programming Guide 159
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