9
Selector switches
Additional functions required in various appli-
cations are selected with switchgroups SGF,
SGB and SGR indicated on the front panel. The
numbering of the switches, 1...8, and the switch
positions 0 and 1 are shown when the switch-
groups are set. Under normal service conditions
only the checksums are shown. Switchgroups
SGF2, SGR2 and SGR3 are found in the sub-
menus of the main menus of switchgroups SGF
and SGR.
Function switch-
group SGF1
On delivery from the factory all switches SGF1
are set at zero, i.e. the checksum for SGF1 is 0.
Switch
Function
SGF1/1
Switches SGF1/1...3 are used for selecting the characteristic of the low-set overcurrent
SGF1/2
stage I>, i.e. definite time operation characteristic or inverse definite minimum time
SGF1/3
(IDMT) characteristic. At IDMT characteristic the switches are also used for selecting
the required current/time characteristic for the stage.
SGF1/1 SGF1/2 SGF1/3 Characteristic
Time or curve set
0
0
0
Definite time
0.05...300 s
1
0
0
IDMT
Extremely inverse
0
1
0
IDMT
Very inverse
1
1
0
IDMT
Normal inverse
0
0
1
IDMT
Long-time inverse
1
0
1
IDMT
RI-characteristic
0
1
1
IDMT
RXIDG-characteristic
1
1
1
---
(Long-time inverse)
SGF1/4
Circuit breaker failure protection (CBFP).
When SGF1/4 =1 the trip signal TS2 will start a timer which will generates a delayed
operate signal via TS1, if the fault has not been cleared before the operate time has
elapsed.
When switch SGF1/4 = 0 the circuit breaker failure protection is out of operation.
SGF1/5
Automatic doubling of the set start current of the high-set overcurrent stage I>> when
the protected object is energized.
When SGF1/5 = 0, no doubling of the start current setting of stage I>> is obtained.
When SGF1/5 = 1, the start current setting of stage I>> doubles automatically.
The doubling feature makes it possible to give the high-set stage a setting value below
the connection inrush current level.
SGF1/6
Switches SGF1/6...8 are used for selecting the operation characteristic of the low-set
SGF1/7
earth-fault stage I
0
>, i.e. definite time characteristic or inverse definite minimum time
SGF1/8
(IDMT) characteristic. At inverse definite minimum time characteristic the switches
are also used for selecting the current/time characteristic of the stage.
SGF1/6 SGF1/7 SGF1/8 Characteristic
Time or curve
0
0
0
Definite time
0.05…300 s
1
0
0
IDMT
Extremely inverse
0
1
0
IDMT
Very inverse
1
1
0
IDMT
Normal inverse
0
0
1
IDMT
Long-time inverse
1
0
1
IDMT
RI-characteristic
0
1
1
IDMT
RXIDG-characteristic
1
1
1
IDMT
Not in use (long-time inverse)
