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SIEMENS CPU 135 U

3/25/2022 12:05 PM	Rate (0)
Ingenieur_el Regular Member Joined: 8/3/2018 Last visit: 10/1/2024 Posts: 21 Rating: (0)	Hello everyone, there is a problem on Siemens Simatic S5 6ES5955-3LC41 Power Supply. The orange RB LOW LED is turned on after change of Lithium Battery. I have replaced with new one Lithium Battery. Normally, the orange LED should be turned off after replacement. Does anyone have experience with a case like this ? Thanks for your reply. Best regards.
	Last edited by: Ingenieur_el at: 03/25/2022 12:30:33
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3/29/2022 7:22 AM	Rate (0)
bit7 Experienced Member Joined: 7/26/2008 Last visit: 9/1/2025 Posts: 109 Rating: (20)	Hi Ingenieur_el, is the battery a Siemens product? There is a procedure to pacify long live batteries.

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3/29/2022 8:06 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 8/28/2025 Posts: 3049 Rating: (1062)	Ingenieur_el The orange RB LOW LED is turned on after change of Lithium Battery. RB LOW LED indicates that the internal Rechargeable Battery is low. MB LOW LED indicates that the Lithium Battery (which you replaced) is low. In any case, try pushing the "Reset Batt + Fan" button first to see if it clears the RB LOW LED. If that doesn't help, check the internal Rechargeable Battery and see the Manual for details too.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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