4.5
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Control Logic
Multiple Setting Groups
The operation of these settings is explained with the following example:
Assume the active setting group starts out as Setting Group 3. Corresponding
Relay Word bit SG3 is asserted to logical 1 as an indication that Setting
Group 3 is the active setting group.
With Setting Group 3 as the active setting group, setting SS3 has priority. If
setting SS3 is asserted to logical 1, Setting Group 3 remains the active setting
group, regardless of the activity of settings SS1, SS2, SS4, SS5, and SS6. With
settings SS1 through SS6 all deasserted to logical 0, Setting Group 3 still
remains the active setting group.
With Setting Group 3 as the active setting group, if setting SS3 is deasserted to
logical 0 and one of the other settings (e.g., setting SS5) asserts to logical 1,
the relay switches from Setting 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
SELOGIC control equation settings SS1 through SS6 have priority over the
serial port GROUP 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 GROUP 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 GROUP n command or
the front-panel {GROUP} pushbutton can be used to switch the active setting
group.
See Section 7: Serial Port Communications and Commands for more
information on the serial port GROUP n command. See Section 8: Front-
Panel Interface for more information on the front-panel {GROUP} pushbutton.
Relay Disabled
Momentarily During
Active Setting Group
Change
The relay is disabled for a few seconds 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 (e.g., latch bit states
are retained during an active setting group change).
Active Setting Group
Switching Example
Previous SEL relays (e.g., SEL-321 Relay and SEL-251 Relay) have 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 4.1 Definitions for Active Setting Group Switching SELOGIC Control
Equation Settings SS1 through SS6
Setting Definition
SS1 go to (or remain in) Setting Group 1
SS2 go to (or remain in) Setting Group 2
SS3 go to (or remain in) Setting Group 3
SS4 go to (or remain in) Setting Group 4
SS5 go to (or remain in) Setting Group 5
SS6 go to (or remain in) Setting Group 6
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