A: Set p2118 and p2119 to map F7902 to “none”. This is dangerous – motor can stall at low speed with full current, leading to winding burnout. Not recommended.
When a Siemens drive detects that the motor’s actual speed has not followed the setpoint speed within a defined tolerance for a specified time, it triggers this fault. In simple terms: the drive commanded rotation, but the motor shaft did not move (or moved too little). | Parameter | Function | Typical Value | |-----------|----------|----------------| | p2177 | Motor blocked time | 10 seconds | | p2178 | Motor blocked delay time | 0 (immediate) | | p2179 | Speed threshold for blocked detection | 5% of rated speed | Siemens Drive Fault Code 7902
A: Check p2179 . If set to 10% and your setpoint is 8%, drive thinks you are blocked. Lower p2179 to 3-5%. A: Set p2118 and p2119 to map F7902 to “none”