: In your commissioning tool or via the operator panel, trigger a "motor identification at standstill".
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This error indicates that the drive attempted to move the motor, but the motor did not rotate as expected. The drive detects excessive torque requirement or zero speed when torque is commanded. Causes:
: Ensure all mandatory motor parameters (power, voltage, current, speed) are entered correctly according to the motor nameplate. Save Parameters : After the optimization is complete, perform a "Copy RAM to ROM" to ensure the data is saved permanently. Check Fault History
When this alarm is triggered, the variable frequency drive (VFD) restricts parameter saving and system operation until the routine completes or is bypassed. Below is a comprehensive guide to understanding, resolving, and optimizing your system when dealing with the A07991 alarm. Core Technical Causes of A07991 siemens fault 0a7991 best
The code (commonly referred to as A7991 or A07991 in Siemens documentation) is a specific alarm for Siemens SINAMICS drives, such as the G120, G130, or S120 series. It indicates that Motor Data Identification is Activated . Understanding Alarm A7991
Depending on the operational stage of your machinery, use one of the following methods to resolve the alarm.
or a machine that was already working? I can give you more specific steps to resolve this. Understanding Siemens Drive Fault Codes | XY Automation
: Sometimes, industry-specific forums or communities can be a good resource. There, you might find discussions about common issues, including fault codes. : In your commissioning tool or via the
Choose "Motor data identification at standstill" in the wizard.
After fixing the issue:
A 500ms timer was added to the PLC logic. The "ON" command to the drive was delayed by 1 second after the contactor feedback. Fault 0A7991 never returned.
In modern facilities, sub-optimal line filtration or brief electrical interruptions can force a drive reboot. If the configuration sequence is incomplete, or parameter is set to run an ID calculation on the next startup, a power cycle triggers the alarm. 4. PLC and Bus Communication Loss If you share with third parties, their policies apply
warning. It is not typically a "fault" that stops the drive, but rather a status alarm indicating that the motor data identification process is active or pending during commissioning. Siemens SiePortal Common Causes Commissioning Phase
Ensure the motor shaft rotates freely and there are no jams in the machinery.
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This complete troubleshooting guide explains the root causes of the A07991 alarm across standard Siemens platforms like the G120, G120C, and S120, and outlines how to bypass or resolve it safely. Root Causes of Alarm A07991
Based on field experience and Siemens technical documentation, here are the primary triggers: