Schweitzer Engineering Laboratories SEL-421-4 - Page 941

5.9
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Control
Disconnect Logic
89CIR m , 89OIR m
The 89CIRm and 89OIRm SELOGIC control equations provide the flexibility to
customize resetting the Close and Open Immobility Timers. By default, 89CIRm
is set to NOT 89OPNm, and 89OIRm is set to NOT 89CLm.
89CL m , 89OPN m
The 89CLm and 89OPNm Relay Word bits report the state of the disconnect
switches. If the disconnect switch is closed, Relay Word bit 89CLm is asserted; if
the disconnect switch is open, Relay Word bit 89OPNm is asserted. See
Figure 5.3 for a description of these inputs.
Disconnect Switch Close and Open Control Logic Action Inputs
89CCN m , 89OCN m
89CCNm and 89OCNm SELOGIC control equations are for programmable close
and open disconnect switch operations. The LOCAL Relay Word bit must be
deasserted for the SEL
OGIC close or open to initiate a disconnect switch opera-
tion. Use care when using SEL
OGIC control equations for disconnect switch oper-
ations; this disconnect operate method is not supervised by the breaker jumper or
appropriate relay access levels as is the case with other disconnect operation
methods.
89CCM m , 89OCM m
89CCMm and 89OCMm Relay Word bits pulse for one-quarter cycle when close
or open disconnect operations are executed from the one-line diagram on the
front-panel screen. The LOCAL Relay Word bit must be asserted, for Relay
Word bits 89CCMm or 89OCMm to assert.
89CC m , 89OC m
The 89CLOSE command or Fast Operate disconnect close message, pulses
Relay Word bit 89CCm for one-quarter cycle. The 89OPEN command or Fast
Operate disconnect open message, pulses Relay Word bit 89OCm for one-quarter
cycle. The LOCAL Relay Word bit must be deasserted for a disconnect switch
operation to be initiated by a Fast Operate message or 89CLOSE and 89OPEN
commands.
Disconnect Switch Close and Open Immobility Timer Logic Settings
89CIT m , 89OIT m
89CITm and 89OITm timer settings in the Bay settings class define the close and
open immobility timers.
Disconnect Switch Close and Open Immobility Timer Logic Outputs
89CIM m , 89OIM m
When 89CIMm or 89OIMm asserts, the close or open immobility timer has
expired.