Schweitzer Engineering Laboratories SEL-311C - Additional Rotating Default Display Example; Displaying Time-Overcurrent Elements on the Rotating Default Display

7.41
Date Code 20060320 Instruction Manual SEL-311C Relay
Inputs, Outputs, Timers, and Other Control Logic
Rotating Default Display (Only on Models With LCD)
Reclosing Relay Disabled
In Figure 7.30, optoisolated input IN102 is de-energized to disable the
reclosing relay, resulting in:
DP1 = IN102 = logical 0
This results in the display of corresponding text setting DP1_0 on the front-
panel display:
Now the active setting group is switched from setting Group 1 to 4.
Switch to Setting Group 4 as the Active Setting Group
When setting Group 4 is the active setting group, the reclosing relay is always
disabled and optoisolated input IN102 has no control over the reclosing relay.
The text settings cannot be changed (they are used in all setting groups), but
the SEL
OGIC control equation settings can be changed:
SEL
OGIC control equation settings:
79DTL = 1 (set directly to logical 1—reclosing relay permanently “driven-
to-lockout”)
DP1 = 0 (set directly to logical 0)
Text settings (remain the same for all setting groups):
DP1_1 = 79 ENABLED (displayed when DP1 = logical 1)
DP1_0 = 79 DISABLED (displayed when DP1 = logical 0)
Because SEL
OGIC control equation display point setting DP1 is always at
logical 0, the corresponding text setting DP1_0 continually displays in the
rotating default display:
Additional
Rotating Default
Display Example
See Figure 5.17 and accompanying text in Section 5: Trip and Target Logic
for an example of resetting a rotating default display with the {TARGET RESET}
pushbutton.
Displaying Time-
Overcurrent Elements
on the Rotating
Default Display
The LCD can display the pickup settings for the time-overcurrent elements in
primary units via a special character sequence in the display points equations.
As with the previously described display points, the operator does not need to
press any buttons to see this information.
To program a display point to show the pickup setting of a time-overcurrent
element, first enter the two-character sequence :: (double colon) followed by
the name of the desired time-overcurrent element pickup settings for 51PP,
51GP, or 51QP.
For example, with the factory default settings for 51PP and CTR, setting
DP1_0 = ::51PP will display
1200.00 A pri.
79 DISABLED
79 DISABLED