ABB REB650 Technical Manual page 112

Section 7
Current protection
106
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.
I3P
Calculation
of final
temperature
Current base used
Binary input:
Forced cooling
Enabled/
Management of
Disabled
setting
parameters: Tau
ANSI08000040 V1 EN
Figure 42: Functional overview of TRPTTR (49)
Final Temp
> TripTemp
Calculation
of heat
content
Actual Temp >
Alarm1,Alarm2
Actual Temp
> TripTemp
Actual Temp
Tau used
Calculation
of time to
Calculation
of time to
reset of
lockout
1MRK 505 277-UUS C
PICKUP
actual heat comtent
ALARM1
ALARM2
Temp
LOCKOUT
S
R
< Recl
Temp
WARNING if time to trip < set value
trip
TRESLO
ANSI08000040-1-en.vsd
Technical Manual
TRIP
TTRIP