Overload Capability Of The Inverter - Siemens Sinamics G120 Hardware Installation Manual

7.2

Overload capability of the inverter

Overload capability is the property of the inverter 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
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
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 the "SIZER" engineering software to select the inverter.
You will find additional information about SIZER on the Internet: Download SIZER
(http://support.automation.siemens.com/WW/view/en/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 p phases. Typi-
cal applications when designing according
to "Low Overload" include:
• Pumps, fans and compressors
• Wet or dry blasting technology
• Mills, mixers, kneaders, crushers,
agitators
• Basic spindles
• Rotary kilns
• Extruders
Power Modules PM240
Hardware Installation Manual, 07/2016, A5E36985441C AA
7.2 Overload capability of the inverter
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, for
reduced base load, dynamic accelerating
phases. Typical applications when design-
ing according to "High Overload" include:
• Horizontal and vertical conveyor
technology (conveyor belts, roller
conveyors, chain conveyors)
• Centrifuges
• Escalators/moving stairways
• Lifters/Lowerers
• Elevators
• Gantry cranes
• Cable railways
• Storage and retrieval machines
Technical data
63