Basic Settings Block - Siemens SIPROTEC easy 7SJ45 Handbuch

Manual 7SJ45

2.7.1 Basic Settings Block

The Basic Settings Block (Figure 2-4) is used to select the basic
settings.
FREQ. 50 Hz
MODE I>>
N INV
IEC 51 V INV
E INV
Figure 2-4 Basic Settings Block, example IEC device
The top switch of the Basic Settings Block is not assigned!
FREQ. 50 Hz/ 60 Hz
This switch sets the device to the existing rated frequency.
MODE I>> / IE
This switch defines which parameters will be evaluated. High-
current stage (I>>) active or evaluation of calculated earth
currents (IE)
C53000-K1174-C001-7
60 Hz
IE
DT O/C
50/51
WARNING!
Changing the IE switch of the Basic Settings Block alters the
meaning of some parameters. Put the sticker that shows the new
parameter settings on top of the front panel printing!
Please note that the sticker cannot be removed again after it has
been applied!
Selecting the operating mode
The other 3 switches are used to define the operating mode of the
protection.
If you want to operate the device as definite-time overcurrent
protection (DT O/C 50/51), set switches 1 to 3 of Basic Settings
Block to switch position "off" (see Table 2-1 on page 52).
If you have selected "DT O/C 50/51" the black printing will
apply for the parameter settings.
If you want to operate the device as an inverse-time
overcurrent protection (IEC 51 or ANSI 51) , select the desired
characteristic by setting one of the switches 1 to 3 to "on" (see
Table 2-1 on page 52).
Please note that only one switch may be in "on" position!
If two or more switches are set to "on" the red "ERROR" LED
flashes. In this state all protection stages are deactivated. Now
select one overcurrent protection characteristic. Press the
Settings
51