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F043 fault in siemens 6RA70 DC Drive

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How can resolve problem F043 fault in siemens 6RA70 DC Drive ?

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Posts: 18330
Admin
Topic starter
(@click2electro)
Member
Joined: 4 years ago

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)

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