5.3
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Control
Disconnect Logic
89CBL
m
, 89OBL
m
The 89CBLm and 89OBLm SELOGIC control equations provide an alternative
customizable method for blocking the initiation of a disconnect switch open or
close command, respectively.
89CRS
m
, 89ORS
m
The 89CRSm and 89ORSm SELOGIC control equations provide the flexibility to
select the signals that reset the close (89CLSm) or open (89OPEm) outputs.
89CRSm defaults to (89CLm OR 89CSIm), and 89ORSm defaults to (89OPNm
OR 89OSIm).
89CSI
m
, 89OSI
m
Set 89CSTm and 89OSTm to seal in the open and close signals for each individ-
ual installation. Relay Word bits 89CSIm and 89OSIm are the outputs of the close
and open seal-in timers, and assert after the appropriate timers expire. By default,
89CSIm and 89OSIm are used in the 89CRSm and 89ORSm SEL
OGIC control
equations to reset the close and open signals, 89CLSm and 89OPEm, that drive
the disconnect switch motor.
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. With the default settings, when Relay
Word bit 89CLm asserts, the close seal-in circuit is blocked, causing 89CLSm to
deassert. Likewise, with the default settings, when Relay Word bit 89OPNm
asserts, the open seal-in circuit is blocked, causing 89OPEm to deassert.
89AL
m
The disconnect switch status and alarm logic in Figure 5.3 generates the 89ALm
Relay Word bit. When Relay Word bit 89ALm asserts, it resets the seal-in cir-
cuits, deasserting the 89CLSm/89OPEm signals.
LOCAL
The LOCAL Relay Word bit asserts when LOCAL SELOGIC control equation
asserts to a logical 1. When the LOCAL Relay Word bit asserts, only the HMI
commands (89CCMm and 89OCMm), can initiate close and open operations.
When the LOCAL Relay Word bit is deasserted, the 89CLOSE, 89OPEN,
SEL
OGIC disconnect close/open, and Fast Operate disconnect close/open com-
mands can perform disconnect close and open operations. The default value for
this setting is NA.
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 close or open SEL
OGIC equations to initiate a disconnect
switch operation. Use care when using SEL
OGIC control equations for disconnect
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