
9
Switchgroup SG3 is a so called software switch-
group, which is located in the fourth submenu
of switchgroup SG1. The front panel push-
buttons STEP and RESET can be programmed
with switches SG3/1…3. Switches SG3/4…8
are not in use. The default value for SG3 is 0.
SG3/1
SG3/2
SG3/3
Push-button
Clear
Reset
Erase
start/trip
latched
memorized
LED's
relays
values
STEP
0
0
0
RESET
x
STEP & RESET
x
x
x
STEP
x
1
0
0
RESET
x
STEP & RESET
x
x
x
STEP
x
x
0
1
0
RESET
x
STEP & RESET
x
x
x
STEP
0
0
1
RESET
x
x
STEP & RESET
x
x
x
STEP
x
1
0
1
RESET
x
x
STEP & RESET
x
x
x
The PC board of the relay module contains a
switchgroup named SGB with eight switches
numbered 1...8. Switches 1...3 are used for
configuring the start initiation signals to the
auto-reclose module, whereas switches 4...8 are
used for configuring blocking signals to the
overcurrent stages of the module. For more
detailed information, see the general descrip-
tions of the different protection relay units.
data being presented are indicated by LED
indicators on the front panel.
Indicator
Measured data
U
0
Residual voltage measured by the module, expressed as a percentage of the rated
voltage U
n
of the energized relay input. If the measured value exceeds 25% of the
rated voltage of the energized relay input the display shows - - -.
I
0
Neutral current measured by the module, expressed as a percentage of the rated
current I
n
of the energized relay input.
I
ϕ
I
0
sin
ϕ
value or I
0
cos
ϕ
value measured by the module, expressed as a percentage of
the rated current of the relay assembly. If I
ϕ
is negative, the digit at the extreme left
on the display shows a red minus sign. If the measured value exceeds 100% of the
rated current of the relay assembly, the display shows either - - - or - - - - depending
on the sign of the I
ϕ
value.
Measured data
The measured values are presented with the
rightmost three green digits on the display. The
NOTE!
The rated current I
n
of the protection relay unit
is the rated current of the energizing inputs of
the relay currently being energized in a particu-
lar application.