4.2
SEL-587Z Instruction Manual
Date Code 20020903
Control Logic
Optoisolated Inputs
Optoisolated Inputs
Relay Word bits IN1 and IN2 follow debounced optoisolated inputs IN1 and
IN2, respectively,
IN1
is debounced input IN1
IN2
is debounced input IN2
EXAMPLE 4.1
Optoisolated Inputs
for an example of an energized and de-energized
optoisolated input and corresponding Relay Word bit states. Note the
built-in pickup and dropout times of 0.25 cycle for energization or de-
energization debounce.
Figure 4.1
Example Operation of Optoisolated Inputs IN1 and IN2.
Configuration of the optoisolated inputs has the following format:
Relay variable (i.e., Relay Word bit, SEL
OGIC
control equation) = IN1
You can initiate an event report in the SEL-587Z when any of the
feeders trip.
Step 1.
After wiring the feeder initiating contacts in parallel, connect
the circuit to IN1.
Step 2. To start an event report, assert either Relay Word bit ER1 or
ER2.
The correct Input 1 assignment to assert ER1 is as follows:
ER1 =
IN1
Event Report Trigger Condition 1
There are no optoisolated input settings such as IN1 = or IN2 =.
The relay polls the digital optoisolated inputs each processing
interval (1/8 of a power system cycle). A digital input change of state
occurs if the input remains in the changed state for two consecutive
processing intervals; otherwise, the software retains the previous
state.
The total time before the relay declares a change of optoisolated
input state is expressed as follows:
Equation 4.1
After 8.34 ms, the software updates the IN1 and IN2 Relay Word bits
to reflect the change of state.
0.25
0.25
0.25
0.25
energized
de-energized
IN2
IN1
IN2
IN1
logical 1
logical 0
(-)
(+)
open
closed
Example
Switch States
Optoisolator
Inputs
Optoisolator
Input States
Built in
Debounce
Timers
Relay
Word Bits
Relay
Word Bit
States
Time
debounce time
2 processing intervals
+
=
1
0.25
60 Hz
•
-------------------------------
è
ø
æ
ö
2
2.083
•
(
)
+
=
4.17 ms
4.17 ms
+
=
8.34 ms
=
Содержание SEL-587Z
Страница 10: ...This page intentionally left blank ...
Страница 12: ...This page intentionally left blank ...
Страница 66: ...This page intentionally left blank ...
Страница 106: ...This page intentionally left blank ...
Страница 126: ...This page intentionally left blank ...
Страница 162: ...This page intentionally left blank ...
Страница 228: ...This page intentionally left blank ...
Страница 260: ...This page intentionally left blank ...
Страница 276: ...This page intentionally left blank ...