Siemens SIPROTEC 7SJ62 Instruction Manual page 131

Example 1 (MW):
Under Current
Set Points
(ANSI 37)
7SJ62 Manual
C53000-G1140-C121-1
Figure 5-37 Warning message from DIGSI
After acknowledgement of the warning, the register sheet Compile under Option →
5HSRUWV can be accessed. By scrolling, an area can be reached in which statements
are given regarding the memory usage, as a percentage of the portion reserved for
CFC. In Figure 5-38 for example, an overload of 56 % is presented for the run-time
level PLC_BEARB (specially noted), while the other running levels are within the al-
lowed range.
Figure 5-38 Reading the loading level for CFC–diagrams
The following contains a few examples. A summary of the CFC configurations provid-
ed at the factory is shown in Appendix A.6.
A configuration for low-current monitoring alarm (see Figure 5-39) which can be pro-
duced using CFC, should be a first example. This element may be used to detect op-
eration without load, or to recognize open circuited conditions. By connecting mea-
sured current values with a limit function via an "OR" function, an indication may be
generated which can be used to trip a circuit breaker.
• The configuration sheet is assigned to run-time sequence MW_BEARB.
• Four function modules (3-lower-value limit modules and an OR gate), are taken
from the function module library and copied into the configuration sheet.
• In the left panel, the measurement values to be monitored (I
inal current) are each selected and connected with the measured value input of
each limit module function.
®
4 when 100 % of allowed memory is used
, I
a b
Configuration
, I in % of the nom-
c
5-37