Cause : Optimization run not possible (active in all operating states) A fault has occurred during an optimization run.

Fault value:
1. Armature current is too low when α=30° and EMF=0. (average armature current <75% of IA, motor or <75% of IA, rated)

Possible cause:

• Armature circuit interrupted
• High-resistance load
• P150 (Alpha G limit) has been set to excessively high value

2. It was not possible to determine the armature circuit resistance (P110) because the armature current was ≥ 37.5 % of P100 in fewer than 20 of the 150 firing cycles of the measuring phase.

Possible cause:

•Armature current of 37.5% of P100 (I A, motor) is no longer possible (although a current of 75% of P100 was already flowing, maybe a fuse has blown).

3. Armature current peaks are too small at α=30° and EMF=0 (armature current peak value <50% of IA, motor or <50% of IA,rated)

Possible cause:

• Armature circuit inductance is too high (field supply from armature terminals)
• P150 (Alpha G limit) has been set to excessively high value Possible remedy:
• Reduce P100 (IA,motor) while this optimization run is in progress