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2 Controls and Indicators
Locator
Name
A
PHASE TAP selector
B
Timing indicators, phase
c
Range plate, phase
0
FUNCTION/OAT A display?
Table 2. Controls and Indicators
Function
A ten-position switch that provides an incremental adjustmen t of the
current pickup tap for all of the phases (simultaneously). The switch
positions are defined for both HIGH and LOW range in a table printed on
the front panel ( locator
switch positions may be established by the Tap Cal register.)
LEOs that illuminate when the preset overcurrent pickup point for the
corresponding phase is exceeded, to indicate that timing is underway.
Indicates the current tap range that applies to the internal scaling of all
the phase inputs of the relay. The range is either HIGH or LOW.
(Reference the TAP value table, locator 0.) Note that the range is
determined (during manufacture) by the style number of the relay. The
position of this plate serves only a documentary purpose.
This four-character, seven-segment LED display (with a right-hand
decimal point for each digit) has two modes of operation: (1 ) the DATA
mode which permits reading the information registers in primary kilo
amperes, and (2) the CONFiguration mode that permits reading and
writing into those registers that control operation of the relay.
The instrumentation registers monitor the input current and the demand
current in kilo amperes. A row of dashes indicates an out-of-range
condition. (Dashes along the bottom of the display indicate that the
current is somewhere below 1 0% of TAP; dashes along the top indicate
a current above 1 50% of TAP.)
When the relay is powered up, the display will default to the DATA
mode. Crossing from one mode to the other, and entering/modifying thE
data is described briefly below (locators I, J}, and in detail in Operation
by Front Panel.
When the d isplay exhibits the word "dAtA" for 60 seconds, the display
wil l begin scrolling through the instrumentation registers in a fixed
sequence. After stepping through all of the DATA registers, the display
wraps aroun d to repeat the sequence until instructed otherwise. This
process is covered in detail beginning on Page 1 0.
A front-panel switch (locator I) can cause the display to exhibit a
particular register of interest in either mode. If, while in the
CONFiguration mode, neither the UP/OWN nor the MODE/NEXT
switches have been actuated for one minute, the display will revert to
the DATA mode. (This protects the settings by requiring the deliberate
action of loading to effect a change. In the DATA mode, however, a
specifically selected register can be displayed indefinitely.) Note that
when in the CONFiguration mode, the relay is inoperative.
0
of Figure 3). (Intermediate settings between the
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