7.42
SEL-311C Relay Instruction Manual Date Code 20060320
Inputs, Outputs, Timers, and Other Control Logic
Rotating Default Display (Only on Models With LCD)
The relay calculates the value to display by multiplying the 51PP setting
(6.00 A secondary) by the CTR setting (200), arriving at 1200.00 A primary.
The relay displays the display point DP1_0 because the factory default
SEL
OGIC control equation DP1 = 0 (logical 0).
The calculations for the remaining time-overcurrent elements are similar,
except for 51GP, which is multiplied by the CTRP setting.
If the display point setting does not match the format correctly, the relay will
display the setting text string as it was actually entered, without substituting
the time-overcurrent element setting value.
Displaying Time-
Overcurrent Elements
Example
This example demonstrates use of the rotating display to show time-
overcurrent elements in primary units. This example will set the 51PP and
51GP to display in the rotating default display.
Set the following:
Setting DPn = 0 and using the DPn_0 in the text settings allows the setting to
permanently rotate in the display. The DPn logic equation can be set to control
the text display—turning it on and off under certain conditions. With the relay
set as shown above, the LCD will show the following:
then,
With the control string set on the even display points “DP2, DP4, DP6, …”
and the description set on the odd display points “DP1, DP3, …” each screen
the relay scrolls through will have a description with the value below it.
For additional format control for the setting elements only, use the following
SET T control string:
Dpi_j = XXX;;[;]ABCDE;YYY
where:
Table 7.9 Settings for Displaying Time-Overcurrent Elements
SET SET T SET L
CTR = 200 DP1_0 = PHASE TRIPS AT DP1 = 0
CTRP = 200 DP2_0 = ::51PP DP2 = 0
E51P = Y DP3_0 = NEUTRAL TRIPS AT DP3 = 0
E51G = Y DP4_0 = ::51GP DP4 = 0
51PP = 6
51GP = 0.75
PHASE TRIPS AT
1200.00 A pri
NEUTRAL TRIPS AT
150.00 A pri
To Next Page
Loading...
