80-4280-10, Rev. 4
5
DIGITAL CONTROL MODULE
(DCM-2)
Group 22 actuators are equipped with a
microprocessor-based electronics assembly
called the DCM-2. The DCM-2 acts as the
control center for the actuator by processing
inputs, generating outputs, and positioning the
output shaft. The DCM-2 also contains most
configuration information, maintains statistics
related to actuator performance.
In Automatic mode, power to run the motor is
controlled by the DCM-2 circuit board assembly.
This circuit board receives a Demand signal from
the external control system, interprets the signal
as an intended output shaft position, then runs the
motor until the output shaft matches that position.
The DCM-2 can communicate with HART
networks, can receive and send analog and/or
digital signals, and includes a local configuration
interface. All models have an “RS 232” serial
interface that can be used for configuration and
diagnostics as well.
SERIAL NUMBER
Each Group 22 actuator has a nameplate
fixed to the exterior of the actuator housing that
includes the actuator serial number. This number
uniquely identifies your specific actuator and it’s
factory built configuration.
The format of the serial number is:
GG MMM-SSSSSS-LL-XX
e.g., 22-309-123501-01-01
where GG is the Group number
MMM is the model number
SSSSSS is the sales order number
LL is the sales order line item number
XX is the sales order sequence number
BECK LINKAGE KITS
Beck pipe linkage kits are available for
completing the mechanical connection from the
actuator crank arm to the load. Through the use
of a standardized selection, the linkage can be
ordered even if the exact length is not determined
until the actuator and driven device are installed.
All Beck Group 22 actuators are furnished
with a crank arm and rod end (see pages 8–11
for dimensions). All rod ends furnished by Beck
incorporate bearings to accommodate some
lateral misalignment. Once the connection is
made, linkage kits can be adjusted ±1 1/2” (38
mm) without removal of the crank arm or load
lever, making final mechanical calibration simple.
CONTROL & OPERATING
FEATURES
In addition to actuator control, the
microprocessor-based electronics provide a host
of features and functions. Some of the advanced
features include:
• Error-based variable speed operation for
precise positioning performance.
• Compatible with common asset management
systems.
• Two-way digital communications via HART®
protocol and RS-232 serial connection.
• Simplified calibration without any mechanical
or electrical adjustment.
• Actuator diagnostics and operating statistics
available locally or remotely.
• Easy configuration, setup and documentation
of actuator operating parameters.
• Live torque measurement and overtorque
protection.
• Stall protection with configurable stall time
setting.
• The choice of linear or square input signal
characterization.
• All operating parameters including temperature
can be displayed via HART.
• Configurable action on loss of Demand input
signal.
• Read/write parameters including tag and
descriptor information, last calibration date,
and model and serial numbers are saved on
board.
• Ability to restore all actuator calibration and
setup information to the factory “as-built”
configuration.
