Installation, Operation and Maintenance Manual
MAN-02-10-93-0700-EN Rev. 0
May 2019
3
Section 2: Features
Features
Section 2: Features
The actuator features several assemblies as shown in Figure 3. Unique features of the
actuator are listed below.
Figure 3
MPA Features
Low Voltage
Interfaces between
CPU and TBM
Electrical Enclosure with
Motor Starter, Control
Transformer, DC Power
Supplies, Power Entry,
Termination Panel, User
Wiring, I/O Interfaces,
Torque Encorder
Integral
Disconnect
BETTIS 3000 Ft-Lb Gearbox
Geared for 1.5 RPM
Position Encorder
Coupling to MPFS Stem
Local Display Module (LDM)
with Display & Status LEDs,
Selector & Control Knobs,
CPU Module,
Network Communications,
Position Encoder
Motor
(not shown)
•
MPA uses Bettis’s heavy duty gearbox with capacity of 3000’ lbs
Threaded Valve Stem
—
Wide range of motors available for any voltage and torque
•
Configurable for multi-port flow selectors from 3 to 8 ports
—
Any port may be selected as home port and any port(s) may be skipped
—
Actuator calibrated at factory for exact match to alignment of flow
selector ports
—
Calibration parameters stored in nonvolatile memory and available to DCS
•
12-bit magnetic encoder coupled directly to valve stem for precision
position feedback
—
Provides position measurement resolution of 0.088 degrees
•
Bettis’s exclusive solid-state motor starter and control software provides precise
positioning of flow selector 1 degree of selected port
•
High performance microcontroller updates motor control output every 4mS for
precision motor control
•
12-bit magnetic encoder coupled directly to torque pinion for torque feedback
—
Provides torque measurement resolution of 0.146% of full torque
