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L91A,B,D PROPORTIONING PRESSURETROL
®
CONTROLLERS
60-2152—08 10
Fig. 8. Removing terminal block bracket.
Fig. 9. Replacing potentiometer in L91.
Fig. 10. Replacing terminal block bracket.
DIFF.
MAIN
MIN
B
D
F
E
C
A
0
4
6
2
1
3
4
5
16
14
12
10
8
0
kPa
OZS
IN
2
DIFF. IS
ADDITIVE
2
6
7
M8521A
REMOVE BRACKET SCREW
FROM TOP OF CASE
TERMINAL
BLOCK
BRACKET
TERMINAL
BLOCK
DIFF.
MAIN
MIN
B
D
F
E
C
A
0
4
6
2
1
3
4
5
16
14
12
10
8
0
kPa
OZS
IN
2
DIFF. IS
ADDITIVE
2
6
7
M8547A
BARE WIRES
(ENAMEL REMOVED)
TERMINAL
BLOCK
R
W
B
POTENTIOMETER WIRES
WIPER ARM
BOLT
POTENTIOMETER
ACTIVE WINDING
POTENTIOMETER
BRACKET
1
1
2
2
THE POTENTIOMETER IN AN L91A IS MOUNTED AT A 45 DEGREE
ANGLE INSTEAD OF HORIZONTALLY. AN L91D HAS TWO
POTENTIOMETERS.
TERMINALS ARE LABELED.
DIFF.
MAIN
MIN
B
D
F
E
C
A
0
4
6
2
1
3
4
5
16
14
12
10
8
0
kPa
OZS
IN
2
DIFF. IS
ADDITIVE
2
6
7
M8548A
TERMINAL
BLOCK
TERMINAL
BLOCK
BRACKET
R
W
B
FIT HOLE IN BOTTOM
OF BRACKET OVER SCREW
PROTRUDING UPWARD
FROM BOTTOM OF CASE