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Sof Starter 3RW40 in inside Delta Circuits

Created by: lufego at: 5/28/2013 6:23 PM (1 Replies)

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5/28/2013 6:23 PM	Rate (0)
lufego Advanced Member Joined: 6/20/2008 Last visit: 6/28/2024 Posts: 14 Rating: (0)	I need to connect a 3RW40 soft starter in inside Delta circuit, to manage a motor with 6 windings. In 3RW44 manual I find a schematic connection. (Chapter 3.2.3). ¿Can I use the same connectionwith 3RW40? ¿There is any tips or special recommendations to do that? Alsoto select the right unit,Ichoose an equipment with a current capacityfor 0.58rated current motor. ¿It is that right? Attachment Soft Starter Diagram.JPG (292 Downloads)

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5/29/2013 12:09 PM	Rate (0)
LesPaul Posts: 467 Rating: (59)	Dear lufego,3RW44 soft starters have thyristors in all three phases. The 3RW30/3RW40 soft starters have thyristors only in two out of the three phases. The third phase is directly wired through. That’s why 3RW30/3RW40 is not suitable for inside delta connection. Also the included technology of 3RW30/3RW40 is not desgined for inside Delta circuit.So if inside Delta connection is really required I recommend a 3RW44 soft starter.But I do not understand why you need an inside Delta circuit. If the motor has 6 windings – is it a Dahlander/multi speed motor?If yes then please have a look at the 3RW30/3RW40 manual chapter 15.11 to find typical circuit diagrams for 3RW40 with Dahlander motors.Download: Manual for SIRIUS 3RW30 / 3RW40 soft starters http://support.automation.siemens.com/WW/view/en/38752095 regards LesPaul
LesPaul Posts: 467 Rating: (59)
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This contribution was helpful to 3 thankful Users dchartier Vithani PISCEAN 2010

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