F07862 — External fault 3

F07862 is one of the externally defined faults: the drive raises it when a condition put together from binary signals in the drive's own interconnection becomes active. Internally, the drive forms an AND logic operation from the binector inputs p2108, p3111 and p3112 (with p3112 entering negated) and initiates the fault on a 1/0 edge of this result, together with the switch-on delay p3110. The fault therefore does not come from a measured current or temperature, but from signal states that the interconnection at these parameters defines. Depending on the drive's configuration, the same condition can also be issued as an alarm (A) instead of a fault; in that variant the drive takes no reaction and no acknowledgement is required.

• The manual names only one cause: The condition for "External fault 3" is satisfied. What actually lies behind it depends on the signals interconnected at p2108, p3111 and p3112.
• In mechanism, the fault is initiated by a 1/0 edge — the AND of the three binector inputs falls from 1 to 0 — with the switch-on delay p3110 belonging to the same triggering logic.

1. Look up which signal sources are interconnected at the binector inputs p2108 (External fault 3), p3111 (External fault 3 enable) and p3112 (External fault 3 enable negated); these parameters define what External fault 3 watches in your plant.
2. Check the state of these signals at the time of the fault: the AND result must have dropped from 1 to 0 for the fault to be initiated.
3. Check the setting of the switch-on delay p3110, which is part of the same triggering logic.
4. Eliminate the causes of this fault — restore the external signal condition so that the AND no longer evaluates to 0.
5. Acknowledge the fault as described below before restarting.

• p2108 (BI: External fault 3) — binector input that feeds the External fault 3 AND logic; start the search here to see which signal is interconnected.
• p3111 (BI: External fault 3 enable) — binector input that enables the fault and enters the same AND logic.
• p3112 (BI: External fault 3 enable negated) — binector input that enters the AND logic in negated form.
• p3110 (External fault 3 switch-on delay) — sets the switch-on delay applied when the 1/0 edge initiates the fault.

Eliminate the causes of the fault first, then acknowledge it. The acknowledgement has to be done immediately; switching the power off and on (POWER ON) also acknowledges the fault. If the message is present only as an alarm (A), it requires no acknowledgement.