Functional path
Selected field unit
DCSLink / DSL cable route
Termination / node relationship
Field exciter ready state
Field acknowledge returned to drive
Configuration and service decision
Diagnostic signals and checkpoints
F521 FieldAckF516 field exciter communication contextExternal DCF unitReady lostNo acknowledge after wiring work12-pulse or field communication installation
Technician notes
- Communication proof is required when the armature converter depends on an external field exciter for acknowledgement.
- Termination, cable routing and field-unit ready evidence can prevent a good SDCS-CON-4 from being replaced.
- A field-unit fault and a communication fault can look similar at the armature converter panel; the evidence must separate them.
Evidence intake
Turn this record into a qualified service request
A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.
- Complete drive type code / MLFB or nameplate model
- Fault code, fault value and first event before reset
- When the event appears: power-up, enable, ramp, run, decel or stop
- Motor/cable connected or isolated during the symptom
- Visible board, option-card, module and connector identifiers
- Previous repair history, replacement parts and repeat-failure pattern