ABB AV1 Operating Instructions Manual page 12

INTRODUCTION
FEATURES
1 - 4
valve provide long life and maximum environmental protec-
tion. The compact housing increases mounting flexibility.
Characterizable Output. Large positioning cam can be
•
shaped to provide desired relationship between the input sig-
nal and the actuator position.
Accurate Calibration. Independent zero and span adjust-
•
ments eliminate interaction and provide fast and accurate cali-
bration.
Simplified Reverse Operation. Action can be changed in the
•
field by changing cams and reversing 01 and 02 connections.
The reverse acting cam is conveniently located on the inside
of the front cover.
Highly Visible Position Status Indicator. A fluorescent
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orange position indicator is visible through a polycarbonate
window, providing fast indication of actuator position.
Vent Design Allows Natural Gas Operation. Vent pipe
•
arrangement permits operation using natural gas.
Split Range Service. Split range capability allows sequencing
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of multiple actuators using a single control signal.
Adjustable Gain. Two levels of gain are possible by changing
•
the hinge springs supplied with the positioner.
Adaptable Usage. The positioner can control both single and
•
double acting, linear and rotary type actuators.
High Capacity. More than 0.65 cubic meters per minute (23
•
standard cubic feet per minute) can be supplied or exhausted
at 482.6 kilopascals (70.0 pounds per square inch gage) sup-
ply pressure (Fig. 1-1).
Continuously Adjustable Span and Zero for Each Stroke
•
Level. Capable of 100-percent stroke for 50-percent signal
span or 50-percent stroke for 100-percent signal span.
Low Air Consumption. Enhanced pilot valve design and
•
manufacturing technique allows the Type AV positioner maxi-
mum performance with minimum air consumption (Fig. 1-2).
Adjustable Speed Control without Additional Hardware.
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Speed of actuator can be reduced to desired speed using the
pilot valve stroke adjustment screws.