Inverter Protection
6-49
Setting the Ambient Temperature
The overload capability of the inverter depends on the ambient temperature. At ambient temperatures higher
than 45°C (40°C for IP20/NEMA1 types) the output current capacity is reduced, i.e. the OL2 alarm level will
be lowered.
Related Constants
The ambient temperature must be set in constant L8-12.
OL2 Characteristics at Low Speed
At output frequencies below 6 Hz the overload capability of the inverter is lower than at higher speeds, i.e. an
OL2 fault (inverter overload) may occur even if the current is below the normal OL2 current level (see Fig.
6.34).
Fig. 6.34 OL2 Alarm Level at Low Frequencies
Related Constants
Generally it is not recommended to disable this function. Otherwise the inverter life time might be shortened.
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
L8-12 Ambient temperature Sets the ambient temperature. 45 to 60 45 °C No A
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
L8-15
OL2 characteristics selection at
low speeds
0: OL2 characteristics at low speeds disabled.
1: OL2 characteristics at low speeds enabled.
0 or 1 1 No A
OL2 Alarm-Level
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