5.23
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Control
Bay Control Front-Panel Operations
Three-Position Disconnect State Representation and Operations From
the Front Panel
A three-position disconnect switch consists of two standard disconnects that
operate together to form a three-position disconnect. All logic diagrams of the
standard disconnect apply to the three-position disconnect, including all settings
and Relay Word bits associated with the two individual disconnects. The three-
position disconnect has two labels, one for the in-line branch and one for the
ground (perpendicular) branch. In the example shown in Figure 5.15, the three-
position disconnect is made up of Disconnect SW3 and Disconnect SW4. As
with the standard disconnect, be sure to correlate the disconnect wiring and set-
tings with the disconnects assigned to the three-position disconnect image on the
one-line diagram.
Figure 5.14 HMI Disconnect Operation Completed
(b) Disconnect Control Screen
(a) Disconnect Control Screen
BAYNAME
OPEN DISCONNECT
CLOSE DISCONNECT
STATUS
UNKNOWN
DmCTLNM
PRESS TO ACTIVATE
BAYNAME
OPEN DISCONNECT
CLOSE DISCONNECT
CLOSE
DmCTLNM
PRESS TO ACTIVATE
89AL1 or
89ICM1
asserted
89CL1
asserted
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