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DC power in v20

Created by: Josh Elliott at: 6/27/2014 6:44 AM (3 Replies)

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6/27/2014 6:44 AM	Rate (0)
Josh Elliott Posts: 204 Rating: (29)	Hi Experts, How to calculate DC power in v20???.....Is there a formula??....written in any siemens documentation ???......
Josh Elliott Posts: 204 Rating: (29)
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6/27/2014 7:15 AM	Rate (0)
William_B Posts: 5225 Rating: (1196)	Josh Elliott Hi Experts, How to calculate DC power in v20???.....Is there a formula??....written in any siemens documentation ???...... Hi there, I am not an expert on the V20 yet; maybe I can help a little. Are you looking to work out the power budget of your machine? Do you want to know how much power is taken from the external 24Vdc power supply? -OR- The DC power converted inside the drive as drawn from the AC input. -OR- Power flowing through the DC bus when connecting several V20 drives on a DC bus. ...... If it is the 1st scenario: The V20 has a 24Vdc power supply included inside the drive. The 24Vdc consumed by an external power supply is what you connect onto.. a) ..opto isolated inputs (max 15mA per pin), b) relay output (max 100mA, load dependant) and c) transistor output (max 500mA, load dependant). If what you look for is documented, it should be in this document: SINAMICS V20 Inverter, Operating Instructions, 02/2013, A5E31842719 It has much more to offer than the Getting Started guide. Does this help you? w
William_B Posts: 5225 Rating: (1196)
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6/27/2014 7:37 AM	Rate (0)
Josh Elliott Posts: 204 Rating: (29)	Hi William Thanks for the quick reply Iam Looking for"The DC power converted inside the drive as drawn from the AC input".
Josh Elliott Posts: 204 Rating: (29)
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6/27/2014 3:28 PM	Rate (0)
Deleted User Posts: 767 Rating: (69)	Josh Elliott Hi William Thanks for the quick reply Iam Looking for"The DC power converted inside the drive as drawn from the AC input". Hello Josh, I am not aware of a published formula, but there are some similar values available in SINAMICS V20. For instance from Operating Instructions Manual, parameter r0032 displays a calculated mechanical shaft power. This should be representative of the power on the dc link minus the minimal losses of conversion from dc-ac for the motor. Also, perhaps could use r0026 Actual filtered DC Link Voltage and r0069(2) DC Link Current. Power would be r0026 times r0069(2) [i.e. Power = Voltage times Current for a dc voltage]. I hope this helps solve your question. Best Regards, Deputy
Deleted User Posts: 767 Rating: (69)
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