How can resolve problem F043 fault in siemens 6RA70 DC Drive ?
Cause : EMF too high for braking operation (active in operating states of – –, I, II)
This fault message is activated if the following 5 conditions are fulfilled when a torque direction reversal is requested (selection of MI or MII):
♦ P272=0 (fault message is parameterized and not alarm + field weakening)
♦ A parameterized, additional, torque-free interval (P160 ≠ 0) has expired
♦ Parallel drive is ready for engagement of the new torque direction
♦ The absolute value of the armature current (K0118, filtered with P190) requested in the new torque direction is >1% of P072.002
♦ The calculated firing angle (K0101) for the armature current requested for the new torque direction is >165 degrees or >P151 when P192=1
Possible fault causes
♦ No “speed-dependent field weakening" (P081=0) is parameterized even though operation in the field weakening range is needed for the requested maximum speed
Note: In motor operation, it is possible to reach EMF values corresponding to the peak of the phase-to-phase supply voltage at a firing angle of αG=30° (rectifier stability limit P150) and low armature currents.
♦ Setpoint EMF for field weakening operation too high (parameter P101 is set too high)
♦ Supply voltage dip
♦ EMF controller or field current controller is not optimized, possibly resulting in excessive EMF on power-up
Calculated firing angle (armature) before limitation (K0101)
- i002 Instantaneously measured actual EMF (K0287)
i003 Armature current controller setpoint (K0118)