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BAF fault on the S7-400 PS after power restoration

Created by: marius75 at: 3/2/2024 3:56 PM (1 Replies)

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3/2/2024 3:56 PM	Rate (0)
marius75 Member Joined: 10/11/2016 Last visit: 7/25/2024 Posts: 1 Rating: (0)	Dears, Good day, we had a long power shutdown in the plant, after the power was restored we faced BAF fault on the power supply and program lost on the cpu, since there was no Efrom installed in the cpu. BAF on power supply is reset by FMR, the back up battery was replaced a year ago. What can be the reason of the BAF fault that got activated during control voltage restoration. Thank you for your answer and recommendation. Attachment Buffer.JPG (517 Downloads)

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3/4/2024 12:48 PM	Rate (0)
Swarley92 Experienced Member Joined: 8/12/2021 Last visit: 10/24/2024 Posts: 328 Rating: (30)	Hi! This fault is detailed in the 400 manual. "It comes on when the battery voltage on the rear bus is too low and the BATT.INDIC. switch is in BATT" It is always advisable to do annual maintenance to change the backup battery. You must also take into account how long the battery has been supporting the program as this will reduce its capacity.
	If this Information really helps, you could use the Rate function Best regards Swarley92
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