Beck 14-100, Инструкция по эксплуатации, Страница: 4 / 92

4
80-1403-01, Rev. 3
Contactless
Position
Sensor
(CPS‑5)
Switches
Digital Control
Module
(DCM‑3)
and Wiring
Terminal Board
Compartment
Tight‑Seater™
Coupling
Motor
The Group 14 product line is a family of linear
electric actuators designed for precise, reliable
operation of globe valves requiring up to 4,000
lbs (17 800 N) of thrust. Group 14 actuators
consist of a motor actuatorn gear box with self-
contained, micro-processor-based electronics for
modulating control. This section describes the
main components and general functions.
HOUSING
Beck actuators have individual cast aluminum
compartments for the main components: The
control motor, wiring terminal board / Digital Control
Module (DCM-3), drive and control end. Gasketed
covers and sealed shafts achieve Type 4 enclosure
ratings ideally suited to outdoor and high humidity
environments.
Heavy cast internal mechanical stops for the
output shaft are designed to prevent accidental
over-travel damage during manual cycling.
ACTUATOR
The Group 14 drive consists of a control motor,
SLM, Handwheel, reduction gears, main gear,
and power screw output shaft. The ductile iron
main gear and the bronze nut and stainless steel
power screw output shaft are common to units of
a particular range of thrust and timing. The steel
reduction gears are part of the field changeable
gear housing assembly. Different combinations
of output gear, housing assemblies, and actuator
motors determine the actuator’s output thrust,
timing and stroke adjustment.
The output shaft travel is limited by mechanical
stops. The mechanical stop for the fully extended
or lower limit of the output shaft travel is not
adjustable. The position of the retracted or upward
travel mechanical stop is determined by the
number of washers on the output shaft between the
Tight-Seater™ and the lower bearing plate. This
is factory‑set for the amount of travel specified at
the time of the order and is generally not changed
in the field.
CONTROL MOTOR
The Beck control motor is a synchronous
motor that operates at a constant speed of 72
RPM (60 Rpm at 50 Hz). Typically, motors reach
full speed within 25 milliseconds and stop within 20
milliseconds.
Beck motors have double grease-sealed
bearings and require no maintenance for the life of
the motor.
SELF-LOCKING MECHANISM
(SLM)
An integral part of every control motor is the
self-locking mechanism. This mechanical device
couples the motor to the gear train and transmits
full motor torque in either direction. When the motor
is de-energized, the SLM prevents backdriving of
the output shaft.
HANDSWITCH
All Group 14 actuators are equipped with a
Handswitch for local electrical control. Refer to
MODES OF OPERATION (page 17).
WIRING TERMINAL BLOCK
All field wiring connections are made in
the terminal block compartment. Refer to
INSTALLATION—ELECTRICAL (page 12).
DIGITAL CONTROL MODULE
(DCM-3)
In Automatic mode, power to run the motor is
controlled by the DCM-3 circuit board assembly.
This circuit board receives signals from the
GENERAL SPECIFICATIONS