Dwyer CBAS User manual

Brand: Dwyer

Model: CBAS

Type: User manual

This manual is also suitable for

Model CBAS

Bulletin PC-CBAS

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

Specifications - Installation and Operating Instructions

Series CBAS Belt Alignment Switch

The Series CBAS is a rugged and reliable conveyor belt align-

ment switch. The compact die cast aluminum housing is de-

signed for easy installation. The switch cover allows for simple

access to wiring terminals and CAM adjustments. Belt alignment

switches are typically used in pairs with one switch on each side

of the conveyor belt mounted near the first and/or last pulley of a

conveyor. Each series CBAS is equipped with two micro switch-

es, allowing one actuation angle for small belt deviations and a

second actuation angle for extreme belt deviations. The actua-

tion angles are factory set at 20 degrees and 35 degrees, each

actuation angle can be easily adjusted in the field to fit any ap-

plication.

APPLICATIONS

• Conventional Belt Conveyors

• Ship Loading/Unloading Systems

• Stacker/Reclaim Conveyors

• Apron Feeder Conveyors

• Tripper or Shuttle Conveyors

• Crane, Shovel, or Drag Line Limit Switch

• Heavy Duty Limit Switch

SPECIFICATIONS

Temperature Limits: -4 to 140°F (-20 to 60°C).

Enclosure: Die cast aluminum.

Enclosure Rating: NEMA 6 (IP 67).

Switch Type: 2 SPDT.

Electrical Rating: 10 amp @ 125/250 VAC; 1/2 amp @ 125

VDC.

Electrical Connection: 3 screw type, common, normally open,

normally closed.

Electrical Conduit: Two 3/4" female NPT.

Activation Angles: 20 degrees and 35 degrees (adjustable).

Activation Force: 0.8 to 1.2 pounds.

Control Type: Automatic reset.

Weight: 6.4 pounds.

0-RING

5-9/16

[141.29]

TOUCH

PULLEY

CASE

COVER

29/32

[25.02]

9/32

[7.14]

COVER BOLTS

4X M10

75°

INSIDE VIEW

CAMS

MICROSWITCHES

INSULATORS

5-21/64

[135.33]

5-49/64

[70.25]

2X 1-1/2

[38.1]

5-1/8

[130.18]

2X 2-11/64

[55.17]

3-43/64

[93.27]

2X 13/32 [10.32]

MOUNTING HOLES

1-15/32

[37.31]

1-63/64

[50.4]

10-9/16

[268.29]

3-11/32

[84.93]

LEVER

2X 3/4˝ NPT

3/16

[4.76]

51/64

[20.24]

1/4

[6.35]

2-9/16

[65.09]

2-9/16

[65.09]

ø2-3/8

[ø60.33]

PC-CBAS:TEMPLATE 3/3/11 3:08 PM Page 1

Operation Principle

The CBAS is typically installed in pairs on both sides of the belt

and positioned 1-6 feet from the head or tail pulley.

The touch roller is deflected by the deviation of the conveyor belt

from a vertical position to 75 degrees, and when the deviation is

restored, a spring will return the touch roller to the vertical

position when the belt is realigned. Cams are preset to turn on

or off the micro switches when the touch roller is deflected. When

the touch roller deviates 20 degrees the first micro switch will

change state, and when the touch roller is deviated 35 degrees

the second micro switch will change state.

Detection (Standard 1C X 2 Output)

* Switching frequency: 20 times/min.

• Number of contact: 1C x 2 output.

TERMINAL NO. TERMINAL NO. TERMINAL NO.

33°

0°

35°(OFF)

18˝ 20˝(ON)

TOUCH ROLLER

INSULATING PLATES

CASING

PACKING

CAMS

SPRING

3/4˝ FNPT CONNECTION

MICROSWITCHES

MAX. SLANT ANGLE 75°

Fig. 1 Construction of CBAS

PC-CBAS:TEMPLATE 3/3/11 3:08 PM Page 2

INSTALLATION

The mounting base should be fitted so that the CBAS touch roller

is 1-3 inches from the outside edge of the conveyor belt. The top

of the idler should be aligned 6.25” from the base of the CBAS.

A typical installations is shown in Fig. 2.

Wiring

The Belt Alignment Switch has 2 SPDT relays that can be

accessed by removing the cover. The independent relays can be

used to control two separate circuits or allow a signal when there

is a slight belt shift and a server belt shift.

TOUCH ROLLER

6.25˝

MOUNTING BASE

CONVEYOR BELT

FRAME OF BELT CONVEYOR

IDLER

TOP OF IDLER

CAM

SHAFT

TOUCH ROLLER

MAXIMUM ANGLE

MICROSWITCH OPERATING POSITION

OPEN

20°

OPEN

CLOSED

35°

Fig. 2 Example of Installation of CBAS

Fig. 3 Micro-switch Operating Positions

PC-CBAS:TEMPLATE 3/3/11 3:08 PM Page 3

ADJUSTMENT

The Belt Sway Switch is adjusted to 20° and 35° at the factory.

If the angle of activation must be adjusted, the following steps

must be taken. Loosen the setscrew using an allen wrench as

shown in Fig 5 so that the cam can be moved. Rotate the cam to

the desired angle, and tighten the setscrew. Move the touch

roller to confirm that the micro switches activate at the desired

angle.

MAINTENANCE/REPAIR

Upon final installation of the Series CBAS, no routine

maintenance is required. The Series CBAS is not field

serviceable and should be returned if repair is needed. Field

repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on

our website. Contact customer service to receive a Return

Goods Authorization number before shipping the product back

for repair. Be sure to include a brief description of the problem

plus any additional application notes.

DEACTIVATEDACTIVATED

ROLLER LEVEL

TERMINAL SCREW

COM-1, 4

NO- 3, 6

NC- 2, 5

MULTISWITCH

ROTATE

CAM

SET SCREW

LOOSEN

TIGHTEN

ALLEN WRENCH

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

Fig. 4 Operation of Micro swtich

Fig. 5 Adjustment of Cam

PC-CBAS:TEMPLATE 3/3/11 3:08 PM Page 4

Dwyer CBAS User manual

Brand: Dwyer

Model: CBAS

Type: User manual

This manual is also suitable for

Model CBAS

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Dwyer CBAS User manual

This manual is also suitable for

Dwyer CBAS User manual

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