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Variable Frequency Drive Operation diagrams

Installation height
The nominal values of the variable frequency drive apply to installation altitudes up to 1000 meters above sea level. If the VFD installation altitude exceeds 1000 meters, the drives output power and cooling agent temperature (ambient temperature) must be reduced.

Reduction of output current
VFD power reduction (VFD derating). Above 1000 m: Reduction by 5%/1000 m. Maximum altitude 3000 m.
Reduction of cooling agent temperature
Above 1000 m: Reduction by 3.3°C/1000 m. Maximum cooling agent temperature 55 °C.
Reduction of VFD output current
Reduction of output current I depending on installation
altitude H.
Reduction of VFD cooling agent temperature
Reduction of cooling agent temperature T depending on installation altitude H.

Temperature
The nominal values of the variable frequency drive apply to a cooling agent temperature between 0 and 40 °C (ambient temperature).

Reduction of output current: VFD power reduction (VFD derating). Above 40 °C: Reduction by 2.5%/K; Tmax = 55 °C
Reduction of VFD output current depending on cooling agent temperature
Reduction of output current I depending on cooling agent temperature T.

Mains voltage
Variable frequency drive reduction of output current (Derating) at constant output power. Above 400 V: 0.22%/V, Umax = 480 V
Reduction of VFD output current depending on output voltage
Reduction of output current I depending on output voltage U (= mains voltage).

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