Danfoss VLT AQUA Programming Manual page 150

2. Parameter Description
14-53 Fan Monitor
Option:
[0]
2
[1]
[2]
14-55 Output Filter
Option:
[0]
[1]
2.13.8. Auto Derate, 14-6*
This group contains parameters for derating the frequency converter in case of high temperature.
14-60 Function at Overtemperature
Option:
[0]
[1]
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.
150
Disabled
* Warning
Trip
* No filter
Sine-Wave Filter
Trip
*
Derate
MG.20.O2.02 - VLT
Function:
Select which reaction the frequency converter should take in
case a fan fault is detected.
Function:
Select the type of output filter connected. This parameter can-
not be adjusted while motor is running.
Function:
If either heatsink or control card temperature exceeds a pro-
grammed temperature limit, a warning will be activated. If the
temperature increases further, select whether the frequency
converter should trip (trip locked) or derate the output current.
Trip [0]: The frequency converter will trip (trip locked) and gen-
erate 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.
Derate
[1]: If the critical temperature is exceeded the output
current will be reduced until the allowable temperature has been
reached.
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VLT AQUA Drive Programming Guide