Overload Capability Of The Converter - Siemens SINAMICS G120 Hardware Installation Manual
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Technical specifications
7.1 Overload capability of the converter
7.1
Overload capability of the converter
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 drive
Low Overload
• LO base load input current
Permissible input current for a "Low Over‐
load" 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
If not specified otherwise, the power and current data in the technical data always refer to a load
cycle according to Low Overload.
We recommend using the "SIZER" engineering software to select the converter.
You can find additional information about SIZER on the Internet:
10804987/130000)
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 phases. Typical
applications when designing according to
"Low Overload" include:
• Pumps, fans and compressors
• Wet or dry blasting technology
• Mills, mixers, kneaders, crushers, agita‐
tors
• Basic spindles
• Rotary furnaces
• Extruders
54
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(http://support.automation.siemens.com/WW/view/en/
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
"High Overload" load cycle
The "High Overload" load cycle permits dy‐
namic accelerating phases at a reduced base
load. Typical applications when designing
according to "High Overload" include:
• Horizontal and vertical conveyor technol‐
ogy (conveyor belts, roller conveyors,
chain conveyors)
• Centrifuges
• Escalators/moving stairways
• Lifters/Lowerers
• Elevators
• Gantry cranes
• Cable railways
• Storage and retrieval machines
Hardware Installation Manual, 04/2021, A5E36265179B-AB
PM250 Power Module
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