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GROUP 31 QUARTER-TURN COMPACT ROTARY ACTUATORS

GROUP 31

Group 31 compact rotary actuators, models 31-M50 and 31-M30, include a single analog electronic control module which receives a 4–20 mA or 1–5 V dc input signal and provides a 4–20 mA or 1–5 V dc feedback for position control and indication.

AVAILABLE TORQUE AND TIMING COMBINATIONS FOR THE MODEL GROUP 31

MODEL NUMBER
CONTROL OPTION
TORQUE (LBS/FT)
STROKE TIME (SECONDS/90°)
31-M50
Option 3
30
24
31-350
Option 2
30
24
31-250
Option 1
30
24
* Stroke times listed are for 60 Hz operation.
ACCURATE POSITION CONTROL

Group 31 compact rotary actuators, models 31-M50 and 31-M30, include a single analog electronic control module which receives a 4–20 mA or 1–5 V dc input signal and provides a 4–20 mA or 1–5 V dc feedback for position control and indication.

  • Electronic module has a deadband of 1.0% of span with sensitivity of 25% of deadband.
  • The input signal span is nominally adjustable from 50% to 125% of the 4 V span, with the zero adjustable up to 120% of span, providing flexibility for split range operation.

Low Power Consumption
for Use with Uninterruptible
Power Supplies

The uniquely low power draw of Beck Group 31 drives permits the use of various standard uninterruptible power supplies for operationduring loss of AC power. Beck Sales Engineers can provide you with specifications on UPS equipment recommended for Beck drives.

POSITION FEEDBACK

Beck Group 31 drives equipped with feedback capability use a film potentiometer incorporated into the control module.

All modulating models feature electronic position indication. Direct AC models allow controllers to monitor drive position as the controller output directly positions the drive. Analog control modulating models provide electronic signal receiver circuitry, which compares the position indication to the control loop demand signal and provides automatic control.

DUAL FEEDBACK CAPABILITY
Models 31-M50, 31-M30, 31-350, and 31-330 have dual feedback capability, permitting user choice of 2-wire or 4-wire field connection.

Connections for feedback selection are made in the field and need not be specified on order.

LIMIT & AUXILIARY SWITCHES

Group 31 compact rotary actuator control modules include four cam-operated switches. Two switches open the motor circuit and function as end-of-travel limit switches, and two auxiliary switches are for external signaling as required by the user. The switch cams are driven directly by the drive’s output shaft for accurate control.

HOLDS POSITION UPON LOSS OF AC POWER

All Group 31 drives stay in place on loss of AC power, with a minimum holding capacity of 150% of rated drive torque. When power is restored, the drive automatically responds to control signal input to move to the position specified.

HOLDS POSITION UPON LOSS OF AC POWER

Convenient Local Operation – Included in the Analog Modulating models is an integral electric Handswitch, which permits safe, local operation at the valve’s individual location. This feature saves time during installation and allows adjustments to be made quickly and easily.

LARGE TERMINAL BLOCK FOR EASY FIELD WIRING

The upper board on the Group 31 drive provides wiring terminals for field connection. This board is easily accessible to minimize time needed for installation wiring and testing.

MOTOR AND DRIVE TRAIN

Beck’s Group 31 compact rotary actuators incorporate an exclusive no burnout motor, so that on-line dependability of valves is ensured. Heat-treated alloy steel and ductile iron hypocycloidal gearing transmits torque smoothly and powerfully to the output shaft. The Beck-built control motor provides millisecond response to signal commands in a modulating control loop—eliminating the coasting and overshooting problems typical of outdated electric actuators.

The motor stator of the Group 31 drive is molded into the centerpiece, providing stable delivery of torque without overheating and without burning out.

MECHANICAL STOPS PROTECTION FROM OVERTRAVEL DAMAGE

Rugged mechanical stops are furnished as a standard component of the valve mounting assembly. These stops prevent over-travel damage to valves and limit drive travel during manual cycling to maintain proper orientation of the drive output shaft with respect to switches and controls. A built-in position indicator shows the valve position.

MANUAL HANDWHEEL FOR CONVENIENT LOCAL OPERATION

A manual Handwheel is standard on all Group 31 models for use during installation and testing, or during power outages. This Handwheel does not require a declutch mechanism for operation and does not rotate during automatic operation.

CONTROL OPTIONS

Group 31 Compact Rotary actuators have one of several model numbers. Each of these Group 31 model numbers is equipped with an electronics package, which are called control options. While other Beck actuator products append the control option to the model number, the Group 31 product line has an inherent association between model number and control option that does not change. The control option number for Group 31 actuators is simply a reference to determine appropriate parts for maintenance. A basic description for each control option is provided below. For details on the electronics components, please visit the Group 31 Electronics section.

3CONTROL
OPTION
MODEL NUMBERS
31-M50
31-M30
CONTROL MODE
Modulating
STANDARD CONTROL INPUT
4-20 mA
STANDARD POSITION FEEDBACK
4–20 mA (4-wire)
DESCRIPTION

The standard modulating drive offering, models 31-M50 and 31-M30 are equipped with control option 3 electronics. Control option 3 electronics have an analog control board that may be controlled with a 4-20 mA or 1-5Vdc signal and provide an integral 4-20 mA or 1-5 Vdc position feedback signal. The position feedback signal may be of the 2-wire variety if specified at the time of order. Option 3 units are equipped with an electric handswitch for manual electric operation as well as stall protection with annunciation.

2CONTROL
OPTION
MODEL NUMBERS
31-350
31-330
CONTROL MODE
Modulating
STANDARD CONTROL INPUT
120 V ac
STANDARD POSITION FEEDBACK
4–20 mA (4-wire)
DESCRIPTION

The control option 2 drive, consisting of model numbers 31-350 and 31-330, is a modulating unit controlled with 120 VAC direct to the motor. These units provide an integral 4-20 mA or 1-5 Vdc position feedback signal that is configured for a 4-wire setup, but may be of the 2-wire variety if specified at the time of order. When the drive hits the limit switch at either of the two end-of-travel positions, power is cut to the motor.

1CONTROL
OPTION
MODEL NUMBERS
31-250
31-230
CONTROL MODE
2-position (open/close)
STANDARD CONTROL INPUT
120 V ac
STANDARD POSITION FEEDBACK
None
DESCRIPTION

The control option 1 drive is an open/close unit controlled with 120 VAC direct to the motor. When the drive hits the limit switch at either of the two end-of-travel positions, power is cut to the motor.

Output Torque and Timing

Specifications Common to All Models:

Switches

Cam controlled, field adjustable. Two limit switches (S3 & S4) open the motor circuit at end-of travel limits. Two auxiliary switches (S1 & S2) provied external signaling as specified through connections made at the terminal board. All four switches are SPDT and are rated for 1 amp at 120 V ac.

Enclosure

Precision machined aluminum alloy castings, painted with corrosion resistant polyurethane paint. All units meet NEMA 4 specifications and are also available FM approved for use in CLass 1, Div. 1, Group D; Class II, Div. 1, Groups E, F, & G; and Class III, Div.’s 1 & 2 hazardous locations.

Instruction Manual # And Rev *
File Type
MODEL #S
CONTROL OPTION
Manufacture Date *
80-3100-03, Rev 10.6
PDF
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
after 7/30/16
80-3100-03, Rev 6
PDF
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
9/16/15 - 7/30/16
80-3100-03, Rev 5.6
PDF
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
before 9/16/15
3D SOLID MODELS *
Model #s *
Control Option *
Additional Options
3D-18-0031-01-OPTB
ZIP
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
3D-18-0031-01
ZIP
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
Mounting Option B
Dimension Drawing # *
Model #s *
Control Option *
Additional Options
18-0031-01o
PDF
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
N/A
18-0031-01o
DXF
31-230, 31-250, 31-330, 31-350, 31-M30, 31-M50
All
N/A
Dimension Drawing # *
Model #s *
Voltage *
Control Option *
Auxiliary Switches *
Notes
17-3001-06o
PDF
31-M50, 31-M30
120
3
2
2-wire FB
17-3001-06o
DXF
31-M50, 31-M30
120
3
2
2-wire FB
17-3001-05o
PDF
31-M50, 31-M30
120
3
2
4-wire FB
17-3001-05o
DXF
31-M50, 31-M30
120
3
2
4-wire FB
17-3001-03o
PDF
31-350, 31-330
120
2
2
4-wire FB
17-3001-03o
DXF
31-350, 31-330
120
2
2
4-wire FB
17-3001-01o
PDF
31-250, 31-230
120
1
2
no FB
17-3001-01o
DXF
31-250, 31-230
120
1
2
no FB
17-3011-01o
PDF
31-250, 31-230
120
1
2
no FB
17-3011-01o
DXF
31-250, 31-230
120
1
2
no FB
17-3011-03o
PDF
31-350, 31-330
120
2
2
4-wire FB
17-3011-03o
DXF
31-350, 31-330
120
2
2
4-wire FB
17-3011-05o
PDF
31-M50, 31-M30
120
3
2
4-wire FB
17-3011-05o
DXF
31-M50, 31-M30
120
3
2
4-wire FB

HOW TO ORDER

The following instructions are provided to make it easy to specify Beck Group 31 drives. Complete wiring, operation and maintenance manuals are furnished with every drive order to make it easy for you to obtain an efficient, long-lasting installation.

Beck Sales Engineers are available to assist you in sizing drives for your applications.

01
DETERMINE REQUIRED PARAMETERS
  • Basic model number
  • Torque (lb-ft)
  • Timing (sec./90°)
02
SPECIFY FULL MODEL NUMBER

Using the information above, fill out the full model number according to the following formula:

03
PROVIDE THE FOLLOWING ADDITIONAL INFORMATION
  • Desired control input signal (Models 31-M30 and 31-M50 only)
  • Desired power supply: 120 V, 60 or 50 Hz.
  • Direction of control drive output shaft travel (CW or CCW, looking at the output shaft) desired with increasing signal (the resulting rotation for direct-coupled valves will be opposite that of the drive).
  • Desired mounting option (A, B, C or D from the outline dimension drawing).
04
STATE WHETHER OR NOT BECK IS TO SUPPLY
LINKAGE
05
SEND YOUR ORDER DIRECTLY TO:
11 Terry Drive, Newtown, PA, USA
For applications assistance, contact a Beck sales or application engineer:
215-968-4600
sales@haroldbeck.com
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