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.
Give the drive a run command to allow it to measure winding resistance and leakage inductance. siemens drive fault code 7902
Before altering any electronic parameters, rule out mechanical failure. Safely lock out and tag out (LOTO) the drive system. The fault is most relevant in , where
The above two conditions have simultaneously persisted longer than the stall delay time ( p2177p 2177 Primary Causes of Fault 7902 Flying restart Marcus looked at the row of
The motor is drawing maximum allowable current ( p0640p 0640
Caps maximum current; if too low, the motor cannot pull enough torque to break a stall. Flying restart
Marcus looked at the row of black modules in the cabinet. "Okay, so we check the second drive."