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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions
12
FEDCBA
FEDCB
A
LOAD TAP
TYPE CI SWITCH
SOURCE I
SEE INSERT FOR
INTERNAL
CONNECTIONS
NOTE: FOR SINGLE-PHASE SENSING
JUMPER TERMINAL A TO B TO C AND
TERMINAL X TO Y TO Z ON TB2
INTERNAL CONNECTION DIAGRAM:
C-INTERRUPTER # 1
SOURCE I AND SOURCE II MUST
PRESENT THE SAME PHASE
ROTATION TO THE LOAD.
SOURCE II
POTENTIAL
SENSING
TRANSFORMERS
500 VA MIN
120 VAC, 60 HZ
SECONDARIES
INTERNAL CONNECTION DIAGRAM:
C-INTERRUPTER # 2
POTENTIAL
SENSING
TRANSFORMERS
500 VA MIN
120 VAC, 60 HZ
SECONDARIES
LS3
(NC)
8
7
65
4
3
2
1
9
10
FEDCBA
TRIP
COIL
R
M
CLOSE
COIL
LS2
(NO)
LS2
(NC)
LS3
(NO)
LS1
(NC)
LS4
(NC)
LS4
(NO)
KEY:
NC = NORMALLY
CLOSED
NO = NORMALLY
OPEN
M = MOTOR
R = RESISTOR
TYPE CI SWITCH
M
LKJHG
MLKJHG
SEE INSERT
FOR INTERNAL
CONNECTIONS
LS3
(NC)
8
7
65
4
3
2
1
9
10
TRIP
COIL
R
M
CLOSE
COIL
LS2
(NO)
LS2
(NC)
LS3
(NO)
LS1
(NC)
LS4
(NC)
LS4
(NO)
LKJHG
M
N
A
B
C
N
X
Y
Z
A
A
B
C
D
B
C
D
E
E
F
G
H
F
G
H
"PT"
"PT"
A
A
B
C
D
E
F
B
C
D
E
F
"SW"
G
G
H
J
K
L
M
H
J
K
L
M
"SW"
Z
Y
X
G
2G1CBA
TB2
POTENTIAL SENSING TRANSFORMERS
21252423
26
1613
14
15
11
TB1
S CONTROL
TRANSFER SWITCH OPERATORS
G1
G2
TO
TPG1
TO
TPG1
TO
TPG1
TO
TPG2
TO
TPG2
TO
TPG2
Figure 8.
Connection diagram for Type S load-transfer control operating the Type PST-9 switch. (The transformer cutouts,
tap fuses, reclosers, and arresters are not shown.)