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GROUP 75 COMPACT ROTARY ACTUATORS

Group 75: Compact Part-Turn Rotary Actuator for Windbox Dampers

The Harold Beck Group 75 series (Model 75-100) provides a compact, high-precision solution for windbox damper control and small quarter-turn valve automation. Specifically engineered for space-constrained environments, this part-turn actuator delivers the same robust reliability and "set it and forget it" performance as our larger drives. By utilizing Beck’s unique no-burnout motor technology, the Group 75 eliminates the positioning drift and maintenance requirements of pneumatic drives, ensuring peak combustion efficiency and stable process control.


Designed for the extreme conditions of industrial boilers and furnaces, the Group 75 offers specialized high-temperature options to maintain absolute accuracy in intense thermal environments. The rugged NEMA 4X enclosure and maintenance-free gear train are optimized for high-cycle modulation, providing instantaneous response and zero-backlash positioning. Whether you are managing airflow or process fluids, the Group 75 provides a durable, energy-efficient motion control solution that maximizes facility uptime and reduces operating costs.


Compact Efficiency and Control Features:

  • • Space-saving compact design optimized for windbox dampers and small valves.
  • • High-temperature construction options available for extreme industrial heat.
  • • Continuous-duty motor prevents overheating during constant modulating cycles.
  • • Precise quarter-turn positioning with zero-backlash for superior air and flow control.
  • • Maintenance-free spur gear construction ensures long-life reliability and performance.
  • • Weatherproof NEMA 4X aluminum housing for protection against dust and moisture.

AVAILABLE TORQUE AND TIMING COMBINATIONS FOR THE MODEL 75-100

TORQUE (LB-FT)
STROKE TIME* (SECONDS/90°)
40
40
80
40
80
24
* Stroke times listed are for 60 Hz operation.
DIGITAL CONTROL MODULE (DCM-3)
Beck’s DCM-3 provides modulating control of the drive in response to standard control system signals.

Notable features include:

    • Convenient user interface for calibration and drive status.
    • HART® compatibility.
    • Compatible with common asset management systems.
    • Receives control signals directly, eliminating the need for contact
      protection devices, relays, switches and reversing starters.
    • Designed to operate continuously at temperatures from -40º F to 185º F (-40° to 85° C).
    • Initiates shaft movement in steps ranging from 0.10% to 0.25% of span, depending on the timing of the gear train.

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FACTORY CALIBRATION

All Beck drives are set-up and calibrated to the customer specification. No electrical adjustments are required before installation. Additional features available on Beck control electronics:

Pre-Determined Action Upon Loss of Input Signal
Stall Protection
Split Signal Operation for Control of Multiple Drives
Temperature Sensing with Alarm
BECK DRIVE MOTOR: PRECISE, RELIABLE CONTROL

Together with Beck’s control electronics and rugged gear train, Beck motors provide the precise, reliable positioning required for modern control loops.

  • Never overheats or burns out, even under demanding modulating control or stalled conditions.
  • Reaches full speed and torque in less than 50 milliseconds and stops within 25 milliseconds, eliminating deadtime.
  • Provides extremely accurate positioning in modulating applications.
  • Will not coast or overshoot the desired position.
  • Low current draw of 0.16 A to 0.4 A, and therefore low power consumption, eliminates the need for relays and permits the use of uninterruptible power supplies.
  • Maintenance-free with double-lipped, grease-sealed bearings.
ELECTRICAL FEATURES ELECTRIC HANDSWITCH: TIME-SAVING LOCAL OPERATION

Dampers or valves may be operated at their individual locations with the built-in electric Handswitch. This saves time during installation and troubleshooting, allowing on-line adjustments to be made quickly and easily by bypassing the electronics in the drive and control system.

The Handswitch also serves as an electrical backup in the event of control system failure.

AUXILIARY AND OVER-TRAVEL LIMIT SWITCHES

Two over-travel limit switches and up to four auxiliary switches are available.

  • SPDT switches rated for a minimum of 6 A at 120 V ac, (three times maximum motor current for most models) to ensure long life.
  • Field-adjustable to operate at any point in the drive’s travel range.
  • May initiate secondary functions or provide remote indication of drive position.
  • Eliminates unreliable and maintenance- intensive proximity switches.

FACTORY CALIBRATION

All Beck drives are set-up and calibrated to the customer specification. No electrical adjustments are required before installation. Additional features available on Beck control electronics:

Pre-Determined Action Upon Loss of Input Signal
Stall Protection
Split Signal Operation for Control of Multiple Drives
Temperature Sensing with Alarm
DRIVE TRAIN: DURABLE AND EFFICIENT
Beck’s durable gear train maintains accurate, consistent control element positioning even under the demanding conditions of an active control loop.
  • Gear trains employ a unique, all spur gear construction of heat-treated alloy steels and ductile iron.
  • Efficient, wide-face spur gearing virtually eliminates wear-induced backlash and positioning inaccuracies.
  • Durable design provides up to 4 days of protection against intermittent or extended accidental stalls.
  • Integral self-locking mechanism ensures that drives hold a load with the motor de-energized.
MANUAL HANDWHEEL: CONVENIENT MANUAL CONTROL WITHOUT DECLUTCH
An easy-to-turn, spoke-free Handwheel is incorporated into the Group 75 design to allow manual operation during installation or power outages.
  • Move valves and dampers to any position smoothly and easily without power, even under full load conditions.
  • Mechanical stops in housing prevent manual overtravel.
  • The motor operates at 72 or 120 RPM, so the Handwheel poses no safety hazard.
MOUNTING VERSATILITY: MOUNT IN ANY ORIENTATION FOR GREATER INSTALLATION FLEXIBILITY
Beck Group 75 Actuators may be mounted in any orientation for greater installation flexibility.

Beck actuators are configured and lubricated in such a way that they may be mounted in any convenient position.  This flexibility allows actuators to be installed in hard-to-fit locations.

As long as housing compartments remain accessible, there are no mounting orientation limts.

HOUSING: SUPERIOR PROTECTION WITH CONVENIENT ACCESS TO COMPONENTS
Drive cutaway view displaying
individual compartments

Beck drives feature a cast aluminum body with individual compartments to protect components from moisture and dirt, and allow easy access for installation and calibration.

  • Precision-machined aluminum alloy castings with corrosion-resistant polyurethane paint provide a rugged, dust-tight, weatherproof enclosure designed to meet Type 4X standards. Models approved for use in hazardous classified locations are available.
  • Individual compartments protect all major components: Motor, DCM, CPS, gear train and installation wiring terminal board.
  • Each compartment can be accessed without exposing other components.
  • Gasketed, precision-machined covers provide extra protection for harsh indoor and outdoor environments.
  • Output and Handwheel shafts are also sealed with weatherproof, double-lip seals.

FACTORY CALIBRATION

All Beck drives are set-up and calibrated to the customer specification. No electrical adjustments are required before installation. Additional features available on Beck control electronics:

Pre-Determined Action Upon Loss of Input Signal
Stall Protection
Split Signal Operation for Control of Multiple Drives
Temperature Sensing with Alarm

Group 75 Beck drives have a model number 75-100. Each drive has the capability to be equipped with different electronics combinations, which are called control options. The control option number will replace the last zero in the model number when specifying a drive model and control option. For example, a model 75-100 drive that is setup to use the control option 9 electronics would be considered a model 75-109 drive. A basic description for each control option is provided below. For details on the electronics components, please visit the Group 11 Electronics section.

9CONTROL
OPTION
CONTROL MODE
Modulating
INSTALLED CONTROL BOARD
DCM
STANDARD CONTROL INPUT
4-20 mA
INSTALLED POSITION SENSOR
Film Pot.
STANDARD POSITION FEEDBACK
4–20 mA

Digital Position Control with Potentiometer Position Sensing
The Beck DCM positions the drive in proportion to an input current or voltage signal, and the Film Potentiometer provides integral feedback for the DCM. A 4–20 mA position feedback signal is available for remote indication. Foundation Fieldbus is also available.
The DCM may be used to provide pre-determined positioning of the drive upon loss of input control signal.

6CONTROL
OPTION
CONTROL MODE
Modulating
INSTALLED CONTROL BOARD
None
STANDARD CONTROL INPUT
120 V ac
INSTALLED POSITION SENSOR
CPS
STANDARD POSITION FEEDBACK
4–20 mA (2-wire)

Direct AC Control with Contactless Position Sensor
Customer must supply three wires to directly control the drive motor direction: One 120 V ac line to run CW (terminal 12), one 120 V ac line to run CCW (terminal 16), and one neutral (terminal 2). Customer must supply two additional wires to power the “2-wire” type CPS (see your specific wiring diagram or the typical wiring diagram below).

5CONTROL
OPTION
CONTROL MODE
Modulating
INSTALLED CONTROL BOARD
None
STANDARD CONTROL INPUT
120 V ac
INSTALLED POSITION SENSOR
Film Pot.
STANDARD POSITION FEEDBACK
None

Direct AC Control with Potentiometer Position Sensing
Customer must supply three wires to directly control the drive motor direction: One 120 V ac line to run CW (terminal 12), one 120 V ac line to run CCW (terminal 16), and one neutral (terminal 2). The position feedback potentiometer connections are available at terminals 32 (CW), 33 (wiper), and 34 (CCW).

3CONTROL
OPTION
CONTROL MODE
Open / Close
INSTALLED CONTROL BOARD
None
STANDARD CONTROL INPUT
120 V ac
INSTALLED POSITION SENSOR
None
STANDARD POSITION FEEDBACK
None

Direct AC Control
Customer must supply three wires to directly control the drive motor direction: One 120 V ac line to run CW (terminal 12), one 120 V ac line to run CCW (terminal 16), and one neutral (terminal 2).

Input Power
120 V ac, single-phase
50 or 60 Hz

Control Types
Modulating with Digital Control Module (DCM)
Modulating direct AC motor control with CPS or Film Potentiometer
2 position (open/close) control

Input and Feedback Signals
4-20 mA (1-5 Vdc input is possible with Option 9 actuators)

Available Communication Protocols
Option 9 actuators may be equipped with HART or Fieldbus Foundation technology

Minimum Step Size (Modulating Control)
DCM — 0.10% (0.15% typical)(configurable)
Direct AC — 0.1° (function of control system capabilities)

Isolation
Demand Input and Position Feedback signals are isolated from the ground and the ac power line.

Operating Conditions
-20° to 85° C. (-4° to 185° F.) – Standard
-20° to 120° C. (-4° to 248° F.) – Optional (High Temperature)
-50° to 85° C. (-58° to 185° F.) – Optional (Low Temperature)

Mounting Orientation
Any orientation – no limitations

Action on Loss of Power
Stays in place.


Action on Loss of Input Signal
(Power On)

Stays in place or, on some drives, is field configurable to move to any preset position.

Overtravel Limit Switches (Dedicated)
Two form C switches provide overtravel protection (option 9) or end-of-travel limits (Option 6, 5, 3).

Auxiliary Switches (non-dedicated)
Up to four 3 A, 120 V ac switches available. Switches are cam-operated and field-adjustable.

Handswitch
Permits local electrical operation, independent of controller signal. Standard on all units. An optional auxiliary contact can be used to indicate that the Handswitch is in “AUTO” mode or to sound an alarm if it is taken out of
“AUTO”.

Handwheel
Provides manual operation without electrical power.

Mechanical Stops
Prevent overtravel during automatic or manual operation.

Stall Protection
On DCM equipped units, protects actuator and driven elements under stall conditions. Time to stall is configurable from 30 to 300 seconds.

Enclosure
Precision-machined, aluminum alloy castings painted with corrosion-resistant polyurethane paint provide a rugged, dust-tight weatherproof enclosure. Designed to meet Type 4X and IP68 (3 meters/48 hours).

Instruction Manual # And Rev *
File Type
MODEL #S
CONTROL OPTION
Manufacture Date *
80-7500-09 Rev 6.9
PDF
75-109
9 (DCM-3)
after 7/24/16
80-7500-09, Rev. 2.4
PDF
75-109
9 (DCM-2)
before 7/25/16
80-7500-03 Rev 5.8
PDF
75-103, 75-105, 75-106
3, 5, & 6
All
3D SOLID MODELS *
Model #s *
Control Option *
Additional Options
3D-18-7500-01-CA
ZIP
75-109
9
w/ Crank arm and base
Dimension Drawing # *
Model #s *
Control Option *
Additional Options
18-7500-01o
PDF
75-109
9
w/ base and standard crank arm
18-7500-02o
PDF
75-109
9
High Temperature Option (Remote Mount DCM)
18-7500-25o
PDF
75-109
9
Remote Mount Portion of Actuator Including DCM and Handswitch
Dimension Drawing # *
Model #s *
Voltage *
Control Option *
Auxiliary Switches *
Notes
17-7509-03o
PDF
75-109
120
9
2
17-7509-03o
PDF
75-109
120
9
2
wago terminals
17-7529-03o
PDF
75-109
120
9
2
screw terminals
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