Siemens F7493 fault code meaning

Series: V90

LR: Actual position value range overflow

servo drive

Meaning: The actual position value range (- 2147483648 ... 2147483647) has been exceeded. When overflow occurs, the "Referenced" or "Absolute measuring system adjusted" status is reset. The actual position value (r2521) has exceeded its value range. The actual encoder position value has exceeded its value range. The product of the maximum encoder value and the factor used to convert the absolute position from increments to position units (LU) has exceeded the range for representing the actual position value. Note for case 3: If the maximum possible absolute position (LU) is greater than 4294967296, adjustment cannot be performed due to overflow. For rotary encoders, the maximum possible absolute position (LU) is calculated as follows: Motor encoder with position tracking: EPOS: p29247 * p29244. Motor encoder without position tracking: For multi-turn encoders: EPOS: p29247 * p29248 * 4096 / p29249. For single-turn encoders: EPOS: p29247 * p29248 / p29249

Possible causes

Source: SINAMICS V90 PROFINET, SIMOTICS S-1FL6 Operating Instructions P378