• If CB failure trip mode is set to "1 out of 3", the resetting logic requires that the
values of all the phase currents drop below the Current value setting.
• If CB failure trip mode is set to "1 out of 4", the resetting logic requires that the
values of the phase currents and the residual current drops below the Current
value and Current value Res setting respectively.
• If CB failure trip mode is set to "2 out of 4", the resetting logic requires that the
values of all the phase currents and the residual current drop below the Current
value and Current value Res setting.
• 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 resetting logic requires that the
circuit breaker is in the open condition and the values of the phase currents and the
residual current drops below the Current value and Current value Res setting
respectively.
The activation of the BLOCK input resets the function.
AND
TON
150.0 ms
CB failure mode ”Current”
CB failure mode ”Breaker
status”
POSCLOSE
CB failure trip mode
“1 out of 4"
IG OR I
0
>
From Level detector 2
I >
From Level detector 1
Set
Reset
Enable timer
BLOCK
AND
OR
Pickup latching mode
”Level sensitive”
AND
PICKUP
AND
OR
CB failure trip mode
“1 out of 3"
CB failure trip mode
“2 out of 4"
OR AND
OR
AND
GUID-623C4380-BE93-4A7D-B65F-293C304D5691 V1 EN
Figure 389: Start logic
1MAC059074-MB A Section 5
Protection related functions
615 series ANSI 775
Technical Manual
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