7
Switch Function
SG1/6 Selection of automatic blocking of starting and tripping of the undervoltage stage U<.
When SG1/6 = 0, the undervoltage stage always operates when a measured voltage falls
below the setting value.
When SG1/6 = 1, starting and tripping of the undervoltage stage are blocked if one of
the measured voltages, falls to a value below 0.2 x U
n
.
This feature can be used for preventing unnecessary startings and trippings during
auto-reclose sequences.
SG1/7 Start time selection for the undervoltage stage U<.
When SG1/7 = 0, the start time is 0.1 s.
When SG1/7 = 1, the start time is 30 s.
SG1/8 Selection of the setting range for the operate time t< of the undervoltage stage U<.
When SG1/8 = 0, the setting range of the operate time is 1.0...12.0 s.
When SG1/8 = 1, the setting range of the operate time is 10...120 s.
Switchgroup SG2 is a so called software switch-
group, which is located in the third submenu of
the checksum register of switchgroup SG1. The
mode of operation, i.e. self-reset or manually
reset, of the LED indicators U> and U< is
determined by the switches of switchgroup SG2.
The mode of operation can be separately set for
each indicator. The mode of operation is set by
means of the checksum, which can be calculated
from the following table. Normally the start
indications are self-reset and the operation indi-
cations manually reset.
Indicator Manually reset Factory default
Start indicator U> 1 0
Operation indicator U> 2 2
Start indicator U< 4 0
Operation indicator U< 8 8
Checksum 15 10
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 switch SG3/1. Switches SG3/2…8 are not
in use. The default value for SG3 is 0.
SG3/1 Push-button Clear start/trip LED's Erase memorized values
STEP
0 RESET x
STEP & RESET x x
STEP x
1 RESET x
STEP & RESET x x
The PC-board of the relay module contains a
switchgroup SGB with eight switches. The
switches 1...3 are used for configuring the start
signals going from the module, whereas the
switches 5, 7 and 8 are used for configuring the
blocking signals applied on the undervoltage
stage in various protection relay units. Switches
4 and 6 have no function in the relay module
SPCU 3C14. Instructions for setting the switch-
group SGB are given in the user's manual of the
protection relay unit and in the signal diagram
of the relay.
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