Danfoss VLT AutomationDrive FC 300 Programming Manual page 61

3 Parameter descriptions
ETR Warning 1-4
Select , to activate a warning on the display when the motor is overloaded.
ETR Trip 1-4
Select to trip the frequency converter when the motor is overloaded.
Programme a warning signal via one of the digital outputs. The signal appears in the event of a warning and if the frequency converter trips (thermal
warning).
ETR (Electronic Terminal Relay) functions 1-4 will calculate the load when the set-up where they were selected is active. For example ETR starts calculating
when set-up 3 is selected. For the North American market: The ETR functions provide class 20 motor overload protection in accordance with NEC.
3
1-91 Motor External Fan
Option:
[0] * No
[1] Yes
60
Function:
No external fan is required, i.e. the motor is derated at low speed.
Applies an external motor fan (external ventilation), so no derating of the motor is required at low
speed. The graph below is followed if the motor current is lower than nominal motor current (see
par. 1-24 Motor Current ). If the motor current exceeds nominal current, the operation time still
decreases as if no fan were installed.
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MG.33.M8.02 - VLT is a registered Danfoss trademark
FC 300 Programming Guide