ABB RED615 Technical Manual page 550

Section 5
Protection related functions
544
If CB failure mode is set to the "Breaker status" mode, the resetting logic requires
that the circuit breaker is in the open condition. If the CB failure mode setting is set
to "Both", the logic resets when any of the above criteria is fulfilled.
Also the activation of the BLOCK input resets the function.
I >
0
From Level detector 2
CB failure trip mode
"2 out of 4"
I >
From Level detector 1
I >
0
From Level detector 2
CB failure trip mode
"1 out of 4"
I >
From Level detector 1
CB failure mode "Current"
POSCLOSE
CB failure mode "Breaker
status"
START
Start latching mode
"Level sensitive"
150.0 ms
Timer 1 elapsed
From Timer 1
Timer 2 elapsed
From Timer 2
BLOCK
GUID-61D73737-798D-4BA3-9CF2-56D57719B03D V3 EN
Figure 286: Start logic
Timer 1
Once activated, the timer runs until the set Retrip time value has elapsed. The time
characteristic is according to DT. When the operation timer has reached the value
set with Retrip time, the retrip logic is activated. A typical setting is 0 - 50 ms.
Timer 2
Once activated, the timer runs until the set CB failure delay value has elapsed. The
time characteristic is according to DT. When the operation timer has reached the
set maximum time value CB failure delay, the backup trip logic is activated. The
value of this setting is made as low as possible at the same time as any unwanted
operation is avoided. A typical setting is 90 - 150 ms, which is also dependent on
the retrip timer.
AND
AND OR
AND
AND
AND
TON
AND
AND
1YHT530004D05 D
AND
Set
Enable timer
Reset
OR
615 series
Technical Manual