When the current is so high that it has given a pickup signal PICKUP, the estimated
time to trip is continuously calculated and given as analog output TTRIP. If this
calculated time get less than the setting time Warning, set in minutes, the output
WARNING is activated.
Calculation
of final
temperature
I3P
Calculation
of heat
content
Final Temp
> TripTemp
actual heat comtent
Actual Temp >
Alarm1,Alarm2
Temp
Actual Temp
> TripTemp
ALARM1
TRIP
Actual Temp
< Recl
Temp
PICKUP
Calculation
of time to
trip
Calculation
of time to
reset of
lockout
TTRIP
TRESLO
Management of
setting
parameters: Tau
Current base used
Binary input:
Forced cooling
Enabled/
Disabled
Tau used
ALARM2
WARNING if time to trip < set value
ANSI08000040-1-en.vsd
S
R
LOCKOUT
ANSI08000040 V1 EN
Figure 42: Functional overview of TRPTTR (49)
Section 7 1MRK 505 277-UUS C
Current protection
106
Technical Manual
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