Backup Battery of PLC System

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Anonymous Poster	Backup Battery of PLC System 04/01/2010 2:57 AM
	dear, I face a problem ,I have a system of plc & I need to change the backup battery of this system due to its expiry ,the voltage of the installed is 3.4 volt. but the voltage of available battery in markets is 3.5 . will this difference in voltage do any damage or missing in data or troubles in system. thank you
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SUMIT THAPAR Member Join Date: Feb 2010 Posts: 8	#1 Re: Backup Battery of PLC System 04/01/2010 8:50 AM
	i wanted to know that the plc is connected to any of micro-controller on the system with same battery supply, if not it does'nt matter much and it also depends upon ur ckt __________________ sumit thapar
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Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7425 Good Answers: 295	#2 Re: Backup Battery of PLC System 04/01/2010 9:37 AM
	When you tell us available battery is 3.5V, is that the design voltage, or measured voltage? A 1.5V battery will (usually) check at 1.6V when new. Most low voltage equipment I use will tolerate about 10% variance in voltage with no troubles. What does the manual for your PLC say? __________________ Semper Ubi Sub Ubi
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SUMIT THAPAR Member Join Date: Feb 2010 Posts: 8	#3 In reply to #2 Re: Backup Battery of PLC System 04/02/2010 9:55 AM
	each and every equipment has its own voltage rating to work from +5v to +7v that it can work when the v/g varies or deflects or when the equipment got heated up then their is some variation in resistance up some %age...... __________________ sumit thapar
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Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7425 Good Answers: 295	#4 In reply to #3 Re: Backup Battery of PLC System 04/02/2010 3:41 PM
	Sumit Thapar, are you the original poster? If yes, I am sorry, but I really do not understand what you are after. I thought you were asking about the memory battery for a PLC? No? And PLC means Programmable Logic Controller to me; is that what we are talking about? If you are not the original poster... well, I don't know what you are saying either. Sorry. __________________ Semper Ubi Sub Ubi
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67model Guru Join Date: Dec 2010 Posts: 1686 Good Answers: 116	#5 Re: Backup Battery of PLC System 08/03/2019 2:51 PM
	You have not indicated the type e.g. primary, rechargeable : carbon-zinc, NiCd... The voltage of 3.5V you give is closest to Li-ion rechargeable (3.6V). A difference of 0.1 volt in 3.5 is not a problem & a reading of 3.4 on existing is an indication of wear-out.
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msbettyhunt Commentator Join Date: Jul 2019 Posts: 83	#6 In reply to #5 Re: Backup Battery of PLC System 08/22/2019 9:19 AM
	Can you please tell, at what reading we should change the battery?
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#7 In reply to #6 Re: Backup Battery of PLC System 08/22/2019 11:15 AM
	..."Most PLC equipment has indicator lights that indicate how much voltage is left in your Programmable Logic Controller (PLC) battery. When the light turns yellow or red or indicates low voltage, it is time to change your PLC battery. Lithium Programmable Logic Controller (PLC) batteries are designed to provide back-up power to the processors memory. Processors draw power from the Programmable Logic Controller battery to retain information in situations where power is lost for 30 minutes or less."... ..."Your average PLC battery will last anywhere from 2 – 5 years according to the type of processor, how much the battery is used and the environment it is in."... https://batteryguy.com/kb/knowledge-base/how-to-install-a-plc-battery/ https://batteryguy.com/kb/knowledge-base/what-is-a-plc-battery/ __________________ All living things seek to control their own destiny....this is the purpose of life
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msbettyhunt Commentator Join Date: Jul 2019 Posts: 83	#8 In reply to #7 Re: Backup Battery of PLC System 08/23/2019 3:02 AM
	Thank you for sharing the useful links.
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