11.2 Load cycles and overload capability
Overload capability is the property of the converter to temporarily supply a current that is higher
than the rated current to accelerate a load. Two typical load cycles are defined to clearly
demonstrate the overload capability: "Low Overload" and "High Overload".
Definitions
Base load
Constant load between the accelerating phases of the converter
Low Overload
● LO base load input current
Permissible input current for a "Low Overload" load cycle
● LO base load output current
Permissible output current for a "Low Overload" load cycle
● LO base load power
Rated power based on the LO base load output current
High Overload
● HO base load input current
Permissible input current for a "High Overload" load cycle
● HO base load output current
Permissible output current for a "High Overload" load cycle
● HO base load power
Rated power based on the HO base load output current
If not specified otherwise, the power and current data in the technical data always refer to a load
cycle according to Low Overload.
Load cycles and typical applications
"Low Overload" load cycle
The "Low Overload" load cycle assumes a uniform base load with low requirements placed on
brief accelerating p phases. Typical "Low Overload" applications include the following:
● Centrifuge pump, fan and compressor
● Axial flow fan
● Propeller pump
"High Overload" load cycle
The "High Overload" load cycle permits, for reduced base load, dynamic accelerating phases.
Typical "High Overload" applications include the following:
● Displacement pump and fan and compressor
● Geared pump
● Screw pump
● Roots blower
Technical data
11.2 Load cycles and overload capability
SINAMICS G120X converter
1084 Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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