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SIMATIC S7-400 / S7-400H / S7-400F /FH

S&7 414 CPU and PS407 power supply BAF indication.

Thread Starter: Shivaji Patil Started: 9/26/2011 5:42 PM Replies: 7

9/26/2011, 5:42 PM

Shivaji Patil

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Dear Expert ,

PS407 shows BAF LED ON as per manual it means Battery is Ok but some short circuit on the back plane.
But we have ONLy PS and CPU 414 , So I removed CPU and switched on the power the PS still has the BAF led ON. I just switched OFF battery monitor switch then BAF goes.
But one thing is sure CPU does not hold the Current data in case of power failure.
Already I replaced the battery (Just try) with new one but no use.
So what could be the solution for this?

Thanks in advance.

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9/27/2011, 8:04 AM

Amit_86

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ShiRaPatil wrote:

PS407 shows BAF LED ON as per manual it means Battery is Ok

Hello, if BAF LED is ON then it menas that your Battery is Faulty.

ShiRaPatil wrote:

I just switched OFF battery monitor switch then BAF goes.

it menas that you dont want to moniter the Battery Healthyness Status.
During OFF Switch Status you will not get actual Battery Status.

ShiRaPatil wrote:

Already I replaced the battery (Just try) with new one but no use.

May be the battery you installed is discharged.

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9/27/2011, 8:20 AM

Marcjan

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Hello,

A new battery does not shut down the Baf warning immediately.

It needs to be depasivated.
That takes a while.
You can speed up the proces by short circuiting the poles for 1 or 2 seconds.

The BAF led should now go off or the battery is empty.

Regards,

Marcjan

Problem solved?
Please let us know!

Please no technical questions by PM, use the forum!

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9/27/2011, 4:12 PM

Shivaji Patil

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Dear Friends ,
Thanks for reply
I gave tried with another battery but still the problem exists.
I am sure batteries are good !!!
Any thing else to checj please.

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9/27/2011, 7:19 PM

Amit_86

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Dear Shrapatil,
Please check Diagnostic buffer of CPU and let us know what is mentioned there????
if possible attach Diagnsotic data here.

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9/27/2011, 8:20 PM

VishP

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Dear Shira,

To eliminate the doubt of battery, u can give 2.7 VDC to 3.6 VDC power to the terminal on the PS407 where the battery are placed. See whether this works or not.

Does ur PS work on external supply and able to give sufficient voltage and current to the CPU?

The reason for quick discharge of the battery could be the shortcircuit on the backplane bus due to frequent power variation and/or disruption.

Thanks,
Vishal Parmar.

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9/29/2011, 10:00 AM

Tagolover

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ShiRaPatil wrote:

Hi

Might sound little absurd but if you still have the battery fault then replace the battery and press the FMR switch and check it will reset the fault. Please check that

If still replace the PS or change the RACK and check.

Have fun.... Rnf:lblSmileyTooltip_