3
Operation by Front Panel
endlessly while the relay remains in the DATA mode unless
deliberately halted as described below.
To stop the display at a particular register, step the display to the
desired read-only register using the NEXT switch . (The registers
will appear in the sequence of
Table 5).
Raising the MODE/
NEXT switch (above center) displays the name of the register
arrived at, and this register will be displayed until manually
advanced (except when "dAtA" is displayed).
Holding the MODE switch up for five seconds or more when the
word "dAtA" is displayed puts the relay into the CONFiguration
mode. Leaving the display at "dAtA" for 60 seconds will cause
it to scroll again.
3.3.4
Instrumentation Disp!ay
The first seven registers of the Data Mode Display Sequence
(Table 5)
comprise the instrumentation display. The first four
registers indicate the current at the CT primaries of each phase
in kiloamperes. Registers 5, 6, and 7 oft he sequence indicate the
demand current (at the primaries in kiloamperes).
The Demand Registers show average kilo ampere demand for
each monitored phase over a time period that is set into the
Demand Period register. (The latter is not accessible from the
front-panel display.) The displayed average is recalculated each
Page 14
minute for each phase by adding the Demand Period samplings
which have accumulated for a given phase, then dividing this
sum by the Demand Period number to obtain the average
demand value. The latter is then displayed in the Demand
Current register for the appropriate phase. (The demand current
values may also be read over the data link.)
All of the instrumentation registers (registers 1 through 7) display
their data in real time. Note that if the amperes are over or under
the operational scale of the ammeter, the display will show a row
of four dashes. The position of these dashes (high or low)
indicate which way the parameter is out-of-range:
If current is below the 1 0% of T AP level, the row of dashes are
along the bottom of the display.
If current is above 1 50% ofT AP, the row of dashes are along the
top of the display.
3.3.5
Error Code
The error code display is the last register of the sequence
describEld in
Table 5.
In the event of a malfunction, the Error
Code register can narrow the search for possible causes. When
this register is at
0000,
there is no error message. If not at
0000,
advise the Siemens Customer Service representative of the
reading. The relay will probably require repair at the factory.
Table 5.
The Data Mode Display Sequence
Display
Display
Sequence
Abbreviation
dRI:R
1
Ph. R
2
Ph. b
3
Ph. c
4
6nd
5
Ph.Rd
6
Ph.bd
7
Ph.cd
8
Err
9
dRI:R
Register
Function
Mode selection window
Phase_A kilo amperes
kilo amperes
c kilo amperes
!!round kilo amperes
demand kilo amperes
Phase_ b_ demand kilo amperes
c_ demand kilo amperes
Error code (see text below}
Wraps to the top
(i.e., to the Mode selection window}
Register
Range
Oto50kA
Oto50kA
O
to
50kA
Oto50kA
Oto50kA
o
to
50
kA
O
to
50kA
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