Date Code 20080110 Control Logic 4-5
SEL-387E Instruction Manual
Group 3 as the active setting group to Setting Group 5 as the active setting group, after waiting
for qualifying time setting TGR to expire:
TGR Group Change Delay Setting (settable from 0 to 900 seconds)
In this example TGR qualifies the assertion of setting SS5 before it can change the active setting
group.
Operation of Serial Port GROUP Command and Front-Panel GROUP Pushbutton
SEL
OGIC
control equation settings SS1 through SS6 have priority over the serial port GRO n
command and the front-panel GROUP pushbutton in selecting the active setting group. If any
one
of SS1 through SS6 asserts to logical 1, neither the serial port GRO n command nor the
front-panel GROUP pushbutton can be used to switch the active setting group. But if SS1
through SS6 all
deassert to logical 0, the serial port GRO n command or the front-panel GROUP
pushbutton can be used to switch the active setting group.
See Section 7: Communications for more information on the serial port GRO n command. See
Section 8: Front-Panel Operation for more information on the front-panel GROUP pushbutton.
Relay Disabled Momentarily During Active Setting Group Change
The relay is disabled for a few power system cycles
while the relay is in the process of changing
active setting groups. Relay elements, timers, and logic are reset, unless indicated otherwise in
specific logic description.
Active Setting Group Switching Example
Previous SEL relays (e.g., SEL-321 Relay and SEL-251 Relay) have had multiple settings
groups controlled by the assertion of three optoisolated inputs (e.g., IN101, IN102, and IN103) in
different combinations as shown in
Table 4.2.
Table 4.2: Active Setting Group Switching Input Logic
Input States
Active
IN103 IN102 IN101
Setting Group
0 0 0 Remote
0 0 1 Group 1
0 1 0 Group 2
0 1 1 Group 3
1 0 0 Group 4
1 0 1 Group 5
1 1 0 Group 6
The SEL-387E Relay can be programmed to operate similarly. Use three optoisolated inputs to
switch between the six setting groups in the SEL-387E Relay. In this example optoisolated
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