The fault is most relevant in , where the drive requires precise motor modeling. In V/f control (a simpler method), the drive does not typically monitor for this condition, which is why switching to V/f mode can sometimes mask the issue.
Use a digital multimeter and, if available, a megohmmeter.
The most effective approach to clearing the 7902 fault is re-commissioning. If your system is failing with F07902, follow these steps in order: 1. Perform a Factory Reset
The Siemens drive fault code indicates that motor has stalled or is out of step
or similar, depending on the model) to allow the drive to "learn" the motor's electrical characteristics. Increase Current/Torque Limits: Check if the stall detection limits ( cap P 2175 cap P 2177 ) are too sensitive for your specific application. Extend Ramp Times: siemens drive fault code 7902
Fault code (or F07902 in SINAMICS G120XA converters) is a common, yet critical, error in Siemens drive systems, indicating that the motor has stalled or is blocked. This fault signifies that the motor is receiving power but is not achieving the speed commanded by the inverter, leading to a protective shutdown.
Subject: G120XA solution to warning F7902 motor out of step - Siemens
In Siemens SINAMICS drives (like the G120 or S120), indicates a Motor Stalled condition . This happens when the drive detects that the motor has stopped rotating for longer than the set delay time, even though the drive is trying to run it.
For persistent cases, Siemens technical support can analyze a drive trace (via Startdrive recording function) to pinpoint whether the fault is load-related or hardware-related. Keep your motor parameters accurate, your cooling vents clean, and your sensor wiring intact—and fault 7902 will become a rare visitor in your maintenance log. The fault is most relevant in , where
This defines the speed below which a stall condition is considered. Lowering this value can prevent premature tripping.
Several factors can lead to the appearance of fault code 7902 on a Siemens drive:
Subject: G120XA solution to warning F7902 motor out of step - Siemens
Regularly lubricate bearings and check conveyor/gearbox alignments to minimize parasitic friction. The most effective approach to clearing the 7902
Siemens drives are widely used in various industrial applications, offering reliable and efficient motor control. However, like any complex device, they can occasionally encounter faults. One such fault code that users may come across is 7902. In this text, we'll explore what the Siemens drive fault code 7902 means, its possible causes, and steps for troubleshooting and resolution.
Fault code 7902 in Siemens drives typically indicates a specific issue related to the drive's operation. The exact meaning can vary slightly depending on the specific model and version of the Siemens drive. However, generally, this code points to a problem that requires attention to prevent further issues or damage to the drive and connected equipment.
: If this happens during an OFF/ON cycle, try activating the "Flying Restart" function (p1200=1).
If your SINAMICS drive just threw a "Motor Stalled" error, don't panic. Here is a rapid-fire checklist to get back up and running: