5.40
SEL-400 Series Relays Instruction Manual Date Code 20171006
Control
Bay Control Example Application
RMS_W := N
FUNDVAR := N
RMS_VA := N
RMS_PF := N
RMS_BK1 := N
RMS_BK2 := N
STA_BAT := N
FUND_VI := N
FUNDSEQ := N
FUND_BK := N
ONELINE := Y
The following settings in the Front-Panel settings provide immediate display of
the one-line diagram screen when Pushbutton 2 is pressed.
PB2_HMI := BC
Output Settings
Output Logic Settings
This illustrates the ability to program disconnect lockout protection for the
selected one-line diagram. To eliminate the danger of closing or opening the
ground switch on an energized line, the disconnect switch cannot operate unless
Breaker 1 is open. When the Disconnect 1 close command is executed (89CLS1),
OUT103 only asserts if the state of Breaker 1 is open (NOT 52CLS1). This illus-
trates disconnect switch lockout protection through SEL
OGIC control equations.
The SEL
OGIC control equation for OUT104 below illustrates similar lockout pro-
tection for the disconnect switch open operation. Wire OUT103 to the disconnect
switch closing circuit and OUT104 to the disconnect switch opening circuit.
OUT103 := 89CLS1 AND NOT 52CLSM1
OUT104 := 89OPEN1 AND NOT 52CLSM1
The outputs in the relay are not
designed to break the coil current in
the disconnect motor. An auxiliary
contact with adequate current-
interrupting capacity must clear the
coil current in the disconnect motor
before the output opens. Failure to
observe this safeguard could result in
damage to the output contacts.
Another example of disconnect lockout would be to ensure that Dis 3 never
closes when the ground disconnect switch Dis 5 is closed. Enter the SEL
OGIC
control equation below for Dis 3 switch lockout protection. 89CLS3 is the close
disconnect switch Relay Word bit for Disconnect 3 and the 89OPN5 Relay Word
bit is the status of Disconnect 5. The SEL
OGIC control equation below will not
assert OUT201 unless both conditions are true.
OUT201 := 89CLS3 AND 89OPN5
These are just a few examples of disconnect lockout control. Use Relay Word bits
and SEL
OGIC programming to design lockout control scenarios required for the
configuration being controlled.
The SEL
OGIC Output settings listed in Table 5. 6 are example close and open dis-
connect equations with disconnect lockout control for Switches 1–5.
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