Siemens siprotec SJ62 User Manual page 169

2 Functions
167
Figure 2-54 Startups according to examples A.1 and A.2
B. Above the thermal restarting limit:
1. A startup brings the machine from load operation into a temperature range far
above the thermal restarting limit and the machine is stopped. The minimum inhibit
time and the equilibrium time are started and „66 TRIP" is reported. The tem-
perature cool-down below the restarting limit takes longer than 4310 T MIN.
INHIBIT and 4304 T Equal, so that the time passing until the temperature falls
below the temperature limit is the decisive factor for clearing the message „66
TRIP". The thermal profile remains "frozen" while the time expires (see Figure 2-
55, to the left).
2. A startup brings the machine from load operation into a temperature range just
above the thermal restarting limit and the machine is stopped. The minimum inhibit
time and the equilibrium time are started and „66 TRIP" is reported. Although
the temperature soon falls below the restarting limit, the blocking „66 TRIP" is
preserved until the equilibrium time and the minimum inhibit time have expired
(see Figure 2-55, to the right).
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015