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How can resolve the alarm Code 7991 and 8526

Created by: babhi at: 11/18/2017 12:19 PM (7 Replies)

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11/18/2017 12:19 PM	Rate (0)
babhi Member Joined: 7/18/2017 Last visit: 7/24/2025 Posts: 4 Rating: (0)	How can i resolve the alarm Code 7991 and 8526. drive can not be configured through TIA13. kindly go through attachment for error code ------------------------------------------------------------------------------------------ Split from Alarm color code query. Attachment alarm code.jpg (1485 Downloads)
	Last edited by: Jen_Moderator at: 11/20/2017 12:24:54 PM New subject after splitting
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11/18/2017 12:20 PM	Rate (0)
babhi Member Joined: 7/18/2017 Last visit: 7/24/2025 Posts: 4 Rating: (0)	How can i resolve the alarm Code 7991 and 8526. drive can not be configured through TIA13. kindly go through attachment for error code Attachment error for drive configuration.jpg (1090 Downloads)

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11/20/2017 1:03 PM	Rate (0)
Murof Platinum Member Joined: 8/3/2009 Last visit: 9/16/2025 Posts: 16436 Rating: (1935)	Hello babhi I Think you are in the wrong Conference. Here in WInCC (TIA) conference the chance to get a proper answer is not as high as in the Drives or PLC Corespndence. Bye Murof
	If this Information really helps, you could use the Rate function
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11/27/2017 11:28 AM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 9/15/2025 Posts: 6040 Rating: (828)	Hello babhi, A7991 comes during commissioning of the drive. 1. make the configuration complete. 2. Change to the commissioning folder and carry out the motor identification at stand still. 3. Make ram to rom ==> A7991 disappears. A8526 means that the bit 10 sent by the first word from the PLC has "0" level. Solution 1: Send 0400 (047E) by the PLC (both in hex) ==> A8526 disappears. Solution 2 : If the PLC is not connected: 2.1. Disable the telegram type by putting p2030 onto "0" level. 2.2. Make ram to rom 2.3. Disconnect the drive from all power (400V and 24V) wait a little bit and connect it again. ==> A8526 disappears.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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5/31/2020 8:47 PM	Rate (0)
uzelac Posts: 12 Rating: (0)	Hi Also have V90 with A8526 No PLC connected, trying to test it by JOG on BOP. Cant remove this alarm. Cant make your soulution with p2030 work since i can not find and change that parameter. I have p2003 and next one is p2153. Thanks
uzelac Posts: 12 Rating: (0)
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7/8/2021 12:06 PM	Rate (0)
AutoGen_7094852 Posts: 1 Rating: (0)	I have the same problem as uzelac, please help me to solve it, thank you
AutoGen_7094852 Posts: 1 Rating: (0)
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12/7/2024 10:10 PM	Rate (0)
Brad_mz Joined: 8/1/2022 Last visit: 5/2/2025 Posts: 3 Rating: (0)	Hi For Error 8526, you need to go online to the parameters, change (fieldbus interface) p2030=0 [no protocol], then go to (save parameters) p0971=1 [save], then wait to see this value to zero again. Then power off/on VFD again and error disappears.

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9/15/2025 12:36 PM	Rate (0)
Moderator_Lan Moderator Joined: 7/30/2024 Last visit: 9/16/2025 Posts: 960 Rating: (16)	New question published by AutoGen_9500131 is split to a separate thread with the subject How can resolve the alarm Code A7991. Best regards Moderator_Lan

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