A06849 — Infeed: Short-circuit operation active

A06849 tells you that the infeed is in short-circuit operation: the current hysteresis controller sequence control has detected a short circuit, and the drive flags this detection in r5452 and r5522. The message itself carries no message value. In the configuration behind this page the code appears as an alarm; depending on how the drive is set up, the same condition can also be issued as a fault or without any reaction.

• The current hysteresis controller sequence control has detected a short circuit; the drive shows this detection in r5452 and r5522.
• The condition is present when the absolute line supply voltage (r5444[0], r5512[0]) lies below the short-circuit voltage limit (p5459[2], p5529[2]) while the current limitation is active (r5402.3 = 1, r5502.3 = 1).
• The effective current limit that applies results from the parameterized overcurrent (p5453) together with the hysteresis width (p5454).

1. Check the parameterization of the current hysteresis controller (p5453); keep in mind that p5453 and the hysteresis width p5454 together give the effective current limit. The manual also points to r5452, the current hysteresis controller sequence control status word, for the state of the sequence control.
2. Check the line supply cables for a short-circuit.

• r5444 — CO: Line droop control line voltage absolute value / U_line AbsV; its signal r5444[0] is the absolute line supply voltage that is compared against the short-circuit voltage limit.
• r5512 — CO: Dynamic grid support line voltage absolute value / Dyn grid U AbsV; r5512[0] is the corresponding absolute line voltage signal for this code.
• p5459 — Current hysteresis controller sequence control state change / I_hyst_ctrl seq; index [2] of it is one of the two signals the manual names as the short-circuit voltage limit.
• p5529 — Dynamic grid support sequence control scaling values / Dyn grid seq scal; its index [2] is the other short-circuit voltage limit signal.
• p5453 — Current hysteresis controller overcurrent limit / I_hyst_ctrl I lim; the overcurrent limit to check, which together with p5454 forms the effective current limit.
• p5454 — Current hysteresis controller overcurrent hysteresis width / I_hyst_ctrl I hyst; the hysteresis width that, with p5453, determines the effective current limit.

Reported as an alarm, A06849 needs no acknowledgement and the drive takes no action in response to it. There is no separate reset step: remove the cause — a wrongly parameterized current hysteresis controller or a short-circuit in the line supply cables — and the condition is gone. If the drive's configuration issues the same condition as a fault instead, it can be acknowledged immediately.