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2 Sitop Power supply 40A with 2 PRM for redundant power supply

Created by: Josh Cheang at: 2/18/2013 4:50 AM (8 Replies)

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2/18/2013 4:50 AM	Rate (0)
Josh Cheang Posts: 7 Rating: (0)	Hi, I have setup an redundant power supply for my PLC system using sitop, but i notice that there are a A/B switch at the botton of the power supply. When i check, on of the setting has mention it has something to do with single operation or parallel operation. My question is: Do i need to use parallel operation setting at the A/B switch for the power suppply? Please find the illustrated wiring (which i borrow from Member "Late") in the attachment. Attachment Redundancy 24V DC 30-40A.JPG (617 Downloads)
Josh Cheang Posts: 7 Rating: (0)
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2/18/2013 6:03 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	Parallel connection of same type of power supplies for redundant operation More info at http://support.automation.siemens.com/WW/view/en/18123560

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2/18/2013 6:42 AM	Rate (0)
Josh Cheang Posts: 7 Rating: (0)	HiUMENCHO, Thanks for your reply. However, my question is not on the wiring or the whole setup itself, but rather the switch setting on the power supply. Should i use parellel operation at Switch A or single operation at Switch A. Refer document:BA_6EP1437-3BA10_7 Attachment BA_6EP1437-3BA10_7.pdf (667 Downloads)
Josh Cheang Posts: 7 Rating: (0)
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2/18/2013 7:00 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	For sharing the loads in parallel operation, the units can be switched from individual operation (OFF switch position) to parallel operation (ON switch position). The ON switch position causes the output characteristic curve to slope 0-1,2V . This switch is nothing to do with redundant power supply. Because in order to achive 100% redundantcythe total load current does not exceed what one power supply is able to deliver alone and the primary-side supply of the power supplies is also designed as redundant. So, the switch A keep OFF in your case. Best regards, Hristo Mihalev

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2/18/2013 7:34 AM	Rate (0)
Josh Cheang Posts: 7 Rating: (0)	HiHristo Mihalev, How about 2 10A Power supply with 1 PRM? Do i have to do anything with the switch? If you were able to elebrate more on the different between switch A to on/off, i will be most appreciated because i have no idea what the meaning of "output characteristic curve to slope 0-1,2V ." May be you could just give some example application of this Switch? Thanks, Josh Cheang
Josh Cheang Posts: 7 Rating: (0)
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2/18/2013 12:37 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/13/2024 Posts: 5697 Rating: (715)	Hello, This switch is used when you put 2 Sitop in paralel to increase performance. The output voltage regulation will be affected. For redundancy you need a powersupply that can power the installation by itself, the second supply is just in case 1 powersupply breaks, therefore diodes or a module is needed. Secure 24 V DC even when a power supply unit fails Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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2/18/2013 1:04 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	And basically if you put A swtch in ON you must clarify for you how to react the system in case of short circuit (swtich B). To be sure that the power supply 1 can handle the system alone.

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2/19/2013 6:57 AM	Rate (0)
Josh Cheang Posts: 7 Rating: (0)	HiMarcjan/UMENCHO, Thanks your explanation. I think i'm clear on the issue. Best Regards, Josh Cheang
Josh Cheang Posts: 7 Rating: (0)
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This contribution was helpful to 1 thankful Users Marcjan

1/15/2016 10:24 AM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by vikas soni is split to a separate thread with the subject Redundancy of two Siemens SITOP. Best regards Min_Moderator

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