ABB REC650 - Page 133

The calculated time to reset of lockout is available as a real figure signal, TENRECL.
The protection has a reset input: RESET. By activating this input the calculated
temperature is reset to its default initial value. This is useful during testing when
secondary injected current has given a calculated “false” temperature level.
Calculation
of final
temperature
IL1, IL2, IL3
Calculation
of actual
temperature
Final Temp
> TripTemp
actual temperature
START
Actual Temp >
AlarmTemp
Actual Temp
> TripTemp
ALARM
TRIP
Actual Temp
< Recl Temp
Calculation
of time to
trip
Calculation
of time to
reset of
lockout
TTRIP
TENRECL
IEC09000637_1_en.vsd
Lock-
out
logic
LOCKOUT
IEC09000637 V1 EN
Figure 51: Functional overview of LCPTTR/LFPTTR
1MRK 511 287-UEN A Section 6
Current protection
127
Technical manual