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valz
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Joined: 26 Jul 2015
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 Posted: 08/12/2021 17:14 Post subject: SINAMICS PM250: Standby Current Calculator |
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SINAMICS PM250: Standby Current Calculator
https://support.industry.siemens.com/cs/document/109804556/
The standby current is the capacitive current that flows to frequency inverters equipped with line-side filter capacitors, EMC filters, etc. You can calculate this with an Excel tool.
Even when the motor is switched off, the converter is supplied from the mains and a (small capacitive) current is consumed. This is a typical phenomenon for any device with capacitive filters.
This current value is small in comparison with active and harmonic currents that the motor and inverter consume, therefore capacitive currents can be typically neglected. However, when many inverters are supplied for the same connection, the standby currents are summed and power cables must be correctly sized.
https://support.industry.siemens.com/cs/attachments/109804556/G120_PM250_standby_current_calculator_2021-10.xlsx
[URL=https://www.file-upload.net/download-14772937/G120_PM250_standby_current_calculator_2021-10.rar.html]G120_PM250_standby_current_calculator_2021-10.rar[/URL]
https://ulozto.net/file/XD6qeTFLfEug/g120-pm250-standby-current-calculator-2021-10-rar |
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valz
Member 3
Joined: 26 Jul 2015
Posts: 771
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| Posted: 08/12/2021 17:15 Post subject: Standby current of the SINAMICS G120 |
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A calculation example can be found into Chapter 2.5 of "SINAMICS G: Information on the standby current of the SINAMICS G120"
https://support.industry.siemens.com/cs/document/34189181/
In many applications, it is necessary to supply several frequency inverters from one infeed unit. The disadvantage of this type of power supply is the fact that the load as well as the no-load (standby) currents are summed - and both the infeed and power supply cables must be appropriately dimensioned.
An electric monorail (EMS) is a typical example of such a drive configuration. In the automobile industry, the EMS is an indispensable transport medium to ensure both flexible and rational material flow.
The behavior of the PM250 / PM250D Power Modules regarding the power and current drawn from the line supply is explained in the description. Using examples, it is shown how the current (apparent current) that the frequency inverter draws from the line supply can be calculated; for instance, when selecting the correct cross-section of power supply cables.
https://support.industry.siemens.com/cs/attachments/34189181/34189181_Standby_currents_G120D_en.pdf
https://support.industry.siemens.com/cs/attachments/34189181/G120D_standby_current_calculator_V2.zip |
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