6.6.6 Monitored data
PID-3908-MONITOREDDATA v7
Table 75: LCPTTR Monitored data
Name
Type Values (Range) Unit Description
TTRIP INTEGER - - Estimated time to trip (in
min)
TENRECL REAL - - Estimated time to reset
of lockout (in min)
TEMP REAL - deg Calculated temperature
of the device
TEMPAMB REAL - deg Ambient temperature
used in the calculations
TERMLOAD REAL - - Temperature relative to
operate temperature
PID-3909-MONITOREDDATA v7
Table 76: LFPTTR Monitored data
Name Type Values (Range) Unit Description
TTRIP INTEGER - - Estimated time to trip (in
min)
TENRECL REAL - - Estimated time to reset
of lockout (in min)
TEMP REAL - Temperature
Fahrenheit
Calculated temperature
of the device
TEMPAMB REAL - Temperature
Fahrenheit
Ambient temperature
used in the calculations
TERMLOAD REAL - - Temperature relative to
operate temperature
6.6.7 Operation principle
M12018-3 v10
The sampled analog phase currents are pre-processed and for each phase current
the RMS value is derived. These phase current values are fed to the thermal
overload protection, one time constant LCPTTR/LFPTTR function. The
temperature is displayed either in Celsius or Fahrenheit, depending on whether
LCPTTR/LFPTTR function is selected.
From the largest of the three-phase currents a final temperature is calculated
according to the expression:
Section 6 1MRK 505 384-UEN A
Current protection
144 Breaker protection REQ650 2.2 IEC
Technical manual
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