ABB REF615 - Page 68

for this. To enable the change of an active setting group via a binary input, connect
a free binary input with SMT to the ActSG input of the SGCB-block.
Table 14: Binary input states and corresponding active setting groups
BI State Active setting group
OFF 1
ON 2
The active setting group defined by a parameter is overridden when a binary input is
enabled for changing the active setting group.
LED2 (EF OPERATE)
OR
EARTH FAULT PROTECTION
SENSITIVE EARTH FAULT PROTECTION
LED3 (SEF OPERATE)
I >
EFLPTOC1
START
OPERATE
I0
BLOCK
ENA_MULT
51N-1
0
I >
EFLPTOC2
START
OPERATE
I0
BLOCK
ENA_MULT
51N-1
0
I >>
EFHPTOC1
START
OPERATE
I0
BLOCK
ENA_MULT
51N-2
0
I >>>
EFIPTOC1
START
OPERATE
I0
BLOCK
ENA_MULT
50N
0
A071350 V4 EN
Figure 26: Non-directional earth-fault protection
Four stages are offered for non-directional earth-fault protection. One stage is
dedicated to sensitive earth-fault protection.
All operate signals are connected to the Master Trip and also to the alarm LEDs. LED
2 is used for directional earth-fault and LED 3 for the sensitive earth-fault protection
operate indication.
Section 3 1MRS756378 D
REF615 variants
62 REF615
Application Manual