Dwyer CPS User Manual

Series CPS Cable Pull Switch

OPERATION-INDICATING

PLATE

INSIDE VIEW

CAMS

INSULATORS

MICROSWITCHES

5-1/8

[130.18]

3-7/16

[87.31]

2-9/16

[65.09]

1-1/8

[28.58]

19/32

[15.03]

COVER BOLTS

4X M10

RESETTING

LEVER

63/64

[25]

CASE

COVER

61/64

[24.21]

3-23/64
[85.33]

1-31/32

[50]

29/32

[23.02]

1-31/32

[50]

51/64

[20.24]

6-1/16

[153.99]

1/8

[3.18]

LEVER

2-21/64
[59.13]

3-15/16
[100.01]

2X 3/4˝

NPT

SHAFT

3-15/16

[100.01]

8-7/16

[214.31]

2-15/64

[5.95]

PULLING DIRECTION

1/4

[6.35]

30°

LOCK POSITION

31/64
[12.3]

2-49/64
[70.25]

2X 2-11/64

[55.17]

2-9/16

[65.09]

2X 1-1/2

[38.1]

5-1/8

[130.18]

1-37/64
[40.08]

9/32

[7.14]

ø13/32 [10.32]

MOUNTING HOLES

SHACKLES

OPERATING DIRECTION

Specifications - Installation and Operating Instructions

Bulletin PC-CPS-1

The Series CPS Cable Pull Switch is designed to provide a

switching system to isolate the power to the conveyor system or
other similar process equipment in event of a shut-down condi­tion. A steel wire is placed along the side of the conveyor and at­tached to the cable pull switch. When the cable is pulled at any
point along the conveyor it will trip the cable pull switch causing
the conveyor to shut down. To restart the conveyor the CPS
must be manually reset. The series CPS has a universal design
for bi-directional activation and utilizes a highly visible red flag to
indicate the switch status. The compact design makes it ideal for
easy installation.

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: 30 degrees.
Activation Force: 11 +/- 2.25 pounds.

APPLICATIONS

• Conventional Belt Conveyors

Control Type: Manual reset.
Weight: 6.4 pounds.

• Ship Loading/Unloading Systems

• Stacker/Reclaim Conveyors

• Apron Feeder Conveyors

• Tripper or Shuttle Conveyors

• Bucket Elevators

• Horizontal Feed Systems

Phone: [phone] www.dwyer-inst.com

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Operation Principle

The CPS is designed to provide a switching system to isolate the
power to conveyor system and other equivalent process
equipment in a shutdown condition. The cable pull switch is
actuated by a steel wire, which is placed along-side the
conveyor. By pulling on the cable at any point, the CPS will
activate when the operating lever rotates 30 degrees clockwise,
automatically locking the switches. The CPS can be reset by
pressing down on the reset lever.

INSULATING PAPER

RESETTING LEVER

MICROSWITCH

CASING

PACKING

OPERATING LEVER

3/4˝ FNPT CONDUIT CONNECTION

SPRING

CAM

Installation

Eye bolts should be prepared before installation, and should be
spaced according to the cable length (Figure 2). A single pull
cord up to 50 feet should have an eye bolt mounted every 10
feet. When using a single pull cord up to 75 feet there should be
an eyebolt every 3 feet. The maximum length of cable between
CPS is 75 feet (Note: Variations in temperature will cause cable
to expand and contract). The ideal cord is a steel cable 0.25
inches in diameter. Figure 3 is a typical installation of a CPS.

CONVEYOR BELT FRAME

CABLE

Fig. 2 Installation of Eye Bolts

EYE BOLTS

FRAME OF BELT

CONVEYOR

CABLE

MOUNTING

BASE

6˝

WIRE CUP

4.5˝

8.25˝

Fig. 3 Typical Installation of CPS

Wiring

The Cable Pull Switch has 2 SPDT relays that can be accessed
by removing the cover. The independent relays can be used to
control two separate circuits such as a motor starter and a signal
light.

TERMINAL SCREW

ROLLER LEVEL

COM-1, 4
NO- 3, 6
NC- 2, 5

DEACTIVATEDACTIVATED

Adjustment

The cams are set at the factory to trip the microswitches when
the operating arm is rotated 30 degrees clockwise. Cams can be
adjusted by loosening the set screw.

MAINTENANCE

Clean excessive amount of dust when it accumulates on the
operating lever. Occasionally check to see if the CPS is working
normally by pulling the cable. After the CPS is installed check the
housing cover to ensure it is tight, water and dust can enter
between the cover and casing if it not tightened correctly causing
the switch to malfunction. The CPS is not field serviceable and
should be returned if any repair is needed (field repair should not
be attempted and may void warranty). Be sure to include a brief
description of the problem plus any relevant application notes.
Contact customer service to receive a returns good authorization
number before shipping.

©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR# R4-443727-50

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]