Instruction Manual
D104239X012
Multiport Flow Selector
January 2019
23
Features
The actuator features several assemblies as shown in figure 3. Unique features of the actuator are listed below.
Figure 3. MPA Features
LOCAL DISPLAY MODULE
(LDM) WITH DISPLAYS &
STATUS LEDS. SELECTOR
& CONTROL KNOBS, CPU
MODULE, NETWORK
COMMUNICATIONS,
POSITIONER ENCODER
POSITIONER
ENCODER
COUPLING TO
MPFS STEM
GEARBOX
INTEGRAL
DISCONNECT
ELECTRICAL ENCLOSURE WITH MOTOR
STARTER, CONTROL TRANSFORMER,
DC POWER SUPPLIES, POWER ENTRY,
TERMINATION PANEL, USER WIRING,
I/O INTERFACES, TORQUE ENCODER
LOW VOLTAGE INTERFACES
BETWEEN CPU AND TBM
MOTOR
(NOT SHOWN)
1. MPA uses Bettis's heavy duty gearbox with capacity of 3000 ft•lbs
a. Wide range of motors available for any voltage and torque
2. Configurable for multi-port flow selectors from 3 to 8 ports
a. Any port may be selected as home port and any port(s) may be skipped
b. Actuator calibrated at factory for exact match to alignment of flow selector ports
c. Calibration parameters stored in nonvolatile memory and available to DCS
3. 12-bit magnetic encoder coupled directly to valve stem for precision position feedback
a. Provides position measurement resolution of 0.088 degrees
4. Bettis’s exclusive solid-state motor starter and control software provides precise positioning of flow selector within
+
0.26 degrees of selected port for the largest flow selector, and within +0.79 degrees for smallest flow selector,
where accuracy is less of a concern because of reduced radius
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