7.40
SEL-351A Relay Instruction Manual Date Code 20080213
Inputs, Outputs, Timers, and Other Control Logic
Rotating Default Display (Only on Models With LCD)
Displaying Values
(Other Than User-
Entered Text) on the
Rotating Default
Display
Table 7.8 through Table 7.11 list all the available values (other than the user-
entered text values, discussed previously) that rotate on the default display,
subject to the number of available display points. These available values cover
metering (Table 7 .8), breaker wear monitor (Table 7.9), and time-overcurrent
element pickups (Tab le 7.1 0 and Table 7.11).
In general, any of these values can be selected for the rotating default display
with a leading two-character sequence:
:: (double colon)
followed by the mnemonic text setting. For example, to display peak demand
currents (Table 7.8) for currents IA, IB, IC, and IN, make the following text
(SET T command) and logic (SET L command) settings:
Logic settings DP1–DP4 are permanently set to logical 0 in this example. This
causes the corresponding DPn_0 value to permanently rotate in the display
(the mnemonics in the DPn_0 settings indicate the value displayed, per
Table 7.8):
then,
The Rotating Default Display on page 11.12 explains pictorially which
display setting is displayed (DPn_0 or DPn_1), depending on the logic state
(logical 0 or 1) of corresponding logic setting DPn.
Values Displayed for Incorrect Settings
If the display point setting does not match the correct format (using the
leading two-character sequence
:: followed by the correct mnemonic), the
relay will display the setting text string as it was actually entered, without
substituting the display value. For example:
Again, logic settings DP1 and DP2 are permanently set to logical 0. This
causes the corresponding DPn_0 value to permanently rotate in the display.
With the DPn_0 setting problems just discussed, the relay displays the setting
text string as it was actually entered, without substituting the intended display
value from Table 7.8:
SET T SET L
DP1_0 = ::IAPK DP1 = 0
DP2_0 = ::IBPK DP2 = 0
DP3_0 = ::ICPK DP3 = 0
DP4_0 = ::INPK DP4 = 0
IA PEAK = 603.5
IB PEAK = 598.7
IC PEAK = 605.1
IN PEAK = 88.2
SET T SET L
DP1_0 = :IAPK (missing :)DP1 = 0
DP2_0 = ::IBPJ (misspelled mnemonic) DP2 = 0
Courtesy of NationalSwitchgear.com
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