activated, it remains active for the time set with the
Trip pulse time
setting or
until the values of all the phase currents drop below the
Current value
setting,
whichever takes longer.
- If
CB failure trip mode
is set to "1 out of 4", the failure detection is based
on either a phase current or a residual current exceeding the
Current value
or
Current value Res
setting respectively. Once TRBU is activated, it remains
active for the time set with the
Trip pulse time
setting or until the values of
all the phase currents or residual currents drop below the
Current value
and
Current value Res
setting respectively, whichever takes longer.
- If
CB failure trip mode
is set to "2 out of 4", the failure detection requires
that a phase current and a residual current both exceed the
Current value
and
Current value Res
setting respectively or two phase currents exceeding the
Current value
. Once TRBU is activated, it remains active for the time set with
the
Trip pulse time
setting or until the values of all the phase currents drop
below the
Current value
, whichever takes longer.
In most applications, "1 out of 3" is sufficient.
• If the
CB failure mode
is set to "Breaker status", the TRBU output is activated
if the circuit breaker is in the closed position. Once activated, the TRBU output
remains active for the time set with the
Trip pulse time
setting or the time the
circuit breaker is in the closed position, whichever is longer.
• If the
CB failure mode
setting is set to "Both", TRBU is activated when the
"Breaker status" or "Current" mode conditions are satisfied.
The activation of the BLOCK input deactivates the TRBU output.
Protection related functions
1MRS758755 C
486 REC615 & RER615
Technical Manual
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