5/22/2008 7:53 AM | |
Posts: 5 Rating:
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Our stupid boss decided to use 1 MM430 15kW (6SE430-2AD31-5CA0) to power simmultaneously for 2 motor (7.5kW for each of them) for 2 pumps of water chiller HVAC system. I think it is not allowed, but I could not persuade him. Who can help me to solve the problem? Is our boss right? And Why? Many thanks and best regards, HTD. P/S: Detail description drawing is in pdf file attached (To Siemens-Model.pdf)! AttachmentTo Siemens-Model.pdf (925 Downloads) |
5/22/2008 10:34 AM | |
Joined: 9/27/2006 Last visit: 9/1/2024 Posts: 12282 Rating:
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Hello htd21; Connecting a single VFD to multiple motors is actually quite common in certain industries; it isa cheap way to obtain speed synchronisation between the motors (limited, of course). There are some conditions of course. Here is a FAQ from a non-Siemens manufacturer of VFDs, but the answers are general enough to apply to most systems: Can more than one AC motor be operated from a single inverter? Answer ): Yes. A VFD can operate multiple motors as long as the full load current ratings of ALL of the motors added up is less than or equal to the output current rating of the VFD. Per the NEC, multiple motor applications must have individual thermal overload protection for each motor. All of the motors connected to the output of the VFD will start and stop together, and will operate at the same speed.Do not use contactors to start and stop individual motors http://www.leeson.com/cgi-bin/fetchpdf.cgi?/literature/tech_info/pdf/drives_faq.pdf |
5/22/2008 12:34 PM | |
Posts: 5 Rating:
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Thank dchartier so much. I think your answer is helpful, but I'm waiting the official response from Siemens' specialists. Thank you once again! |
5/22/2008 3:44 PM | |
Posts: 5 Rating:
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Thank! It's very kind of you all. |
5/23/2008 5:33 AM | |
Posts: 148 Rating:
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And dont do the Motor Id test. |
10/6/2008 5:01 PM | |
Posts: 739 Rating:
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Hi, There are a few possibilities, lets start with the motor. How long is the summation of your cable length? Maximum length is 300m un screent cable with output choke. To set up the Motor data parameterise the summation of current and power, measure the resistance of all three motors. Use v/f characteristic.Don’t use contactors, fuses or circuit breaker between inverter and motor. The inverter. The dark display shows a “under voltage in the DC-link”. May be your supply voltage is to low, a bad connection in a line cable, a broken line – fuse, a defect preecharging system. FAQ: http://support.automation.siemens.com/WW/view/de/14390055 Hint: go back to factory reset (p0010 = 30) use V/f-characteristic (P1300 = 0) set up the summation of motor current and power – and use the “Siemens Motor data” |
4/11/2020 9:37 AM | |
Posts: 5 Rating:
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Sinamics V20 also ( apart from G series)supports multi-motor applications, just perfect for your application. As the stupid you think your boss, he might not be so : ) |
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