ABB AV3, Instruction Manual

Page: 80 / 103

POSITION TRANSMITTERS
CALIBRATION
A - 5
a. Remove the cam by removing the screw, flag, nut, and
washer (Fig.
A-3 ).
b. Loosen the set screw on the hub of the small gear using a
-inch Allen wrench (Fig. A-3 ).
c. Use a screwdriver to adjust the shaft on the potentiometer
until the ohmmeter reads 200,
±
20 ohms. While adjusting the
resistance, hold the gears and cam shaft stationary so rotation
does not occur. Only the potentiometer shaft should move while
adjusting the resistance.
1 16
⁄
Figure A-3. Potentiometric Position Transmitter Assembly (Exploded View)
N OT E S :
1 . S O M E H A R DW A R E IT EM S H AV E
B EE N O M IT T ED F O R C L A R IT Y.
2 . ID E N T IF IE D IT E M S P E RTA IN TO
T H E P O S IT IO N T R A N S M ITT E R
O P T IO N O N LY.
T 00 78 8 A
T E R M IN A L
B L O C K TB 1
2 1
9 5
9 6
3 1
6 0
2 7
9 2
P O T E N T IO M E TE R
(200 0 )
Ω
S E T S C R E W
C A M
F LA G
M O U N T IN G B R A C K E T
S M A L L G E A R
L A R G E G E A R