Electro Cam EC-3400 User Manual
EC-3000/3400 Series
Solid State Rotary Cam Limit Switches
Interrupter Discs and
Photocouplers
Internal
Degree Wheel
and Pointer
Eliminate Contact
Wear and Bounce
Interrupter Discs
Seat Tightly on O-Rings.
Easy-to-Adjust with Wrench.
No Cumbersome Lock Screws
Plug-In
AC, DC, or
Reed Relay
Output Modules
Gasketed NEMA 12
Enclosure on EC-3000;
NEMA 4X Stainless Steel
Enclosure on EC-3400
Description
EC-3000 Series and EC-3400 Series Rotary Cam Limit Switches
use interrupter discs and photocouplers instead of traditional
cams and mechanical limit switches, eliminating contact wear
and bounce. They provide on/off control of devices such as glue
guns, solenoids, air cylinders, or relays on shaft-driven machinery. Electronic Cam Limit Switches can be used as stand-alone
switches, or they can be interfaced to programmable logic controllers (PLC’s) or other logic circuitry.
Although generally used for applications which do not require
setpoint adjustment for speed changes or product changeover,
EC-3000 Series and EC-3400 Series switches can accommodate multiple setpoint schemes by assigning groups of interrupters to different product configurations. For product changeover,
simply activate the appropriate group of interrupters.
Typical applications for EC-3000 Series and EC-3400 Series
switches include cartoners and case packers, palletizers, gluing
machines, high-speed presses, automatic assembly, pick and
place equipment, and similar machinery.
Right, Left, or
Double-Ended Shaft
Configurations
Available
Heavy-Duty
Sealed
Ball Bearings
Features
• Available with 4, 8, or 12 fused, optically-isolated outputs.
• Heavy-duty construction for industrial environments.
• Plug-in modules for AC or DC outputs; replaceable input/
output fuses, easily removed and installed with a needle
nose pliers.
• LED’s indicate output status.
• EC-3000 units housed in NEMA 12 enclosures; EC-3400
units housed in NEMA 4X stainless steel enclosures.
• Sealed ball bearings.
• Internal degree wheel and pointer located on shaft for easy
and accurate adjustment.
• Right, left, or double-ended shaft extensions with a #606
Woodruff key provision; double-ended stainless steel shaft
standard with NEMA 4X models.
• Available options include multi-pulse discs, external degree
wheel and pointer, sprocket disengagement clutch, highvibration models, and special shafts.
• Standard EC-3000 and EC-3400 UL listed, CSA certified;
240 VAC models not UL listed.
13647 Metric Rd • Roscoe, IL 61073 USA • 815-389-2620 • FAX 815-389-3304 • 800-228-5487 (USA and Canada)
Theory of Operation
Degree Wheel
Pointer
Degree Wheel
Adjustable to
Correspond to
Machine Zero
Photocoupler
0 to 180 Degree Mode
-Light Energized181 to 360 Degree Mode
-Dark Energized-
SWITCH
MODE
0° - 180°
Light
Energized
DIP Switch
Figure 1
ENERGIZED
BY
Photocoupler
Light Beam
-PASSING-
Wrench
for Cam Adjustment
LED Indicator
ON
TIME
Fully
Adjustable
1° to 180°
Interrupter Disc
Halves
From
0° to 170°
ON for 170°
As shown in Figure 1, each output switch is controlled by
two-part interrupter discs which break the beam of light in
a photocoupler. If the DIP switch associated with a
photocoupler is in the “0° to 180°,” or Light Energized mode,
the output will be switched on when the beam is unbroken.
If the DIP switch is in the “181° to 360°,” or Dark Energized
mode, the output will be switched on when the interrupter
breaks the beam.
The gap, or open window in the interrupter is adjusted by
using a wrench to turn the disc halves. Shown below in
Figure 2 is a chart showing a few examples of setting “on”
times, by adjusting the gap and the DIP switch positions.
Disc halves seat tightly to the shaft with O-rings. The discs
are easy to adjust with a wrench, requiring no cumbersome locking screws or other devices.
EXAMPLE
CAM SETTINGS
From
45° to 180°
ON for 135°
From
90° to 135°
ON for 45°
From
312° to 322°
ON for 7°
45°
181° - 360°
Dark
Energized
Photocoupler
Light Beam
-BLOCKED-
Fully
Adjustable
181° to 359°
"0"
From
170° to 0°
ON for 190°
170°
From
180° to 45°
ON for 225°
135°
7°
"0"
"0"
From
135° to 90°
ON for 315°
"0"
From
322° to 315°
ON for 353°
Figure 2
†
SINKING or SOURCING ( as pertaining to Electro Cam Corp. products )
Sinking
common or ground to the connected device.
Sourcing
voltage to the connected device.
This information is important when interfacing an Electro Cam Corp. product with another electronic device. The terms
SOURCING
Bradley 1746-IN16 “sinking” input card* or similar A-B device, you have to supply a +DC voltage to this card, NOT a DC common o r
ground. In these cases,
means that when the logic is true and the output (or input device) is ON, the output (or input device) is providing a DC
means that when the logic is true and the output (or input device) is ON, the output (or input device) is providing a +DC
SINKING /
are not used in the same context by all manufacturers. If you are using an Electro Cam Corp. product input to an Allen-
Sinking
is what the card does with the input voltage; sinks it to common or ground.
* Other manufacturers include, but not limited to: Koyo (formerly GE Series 1, Texas Instruments, or Siemens SIMATIC PLS’s) that use descriptions
similar to Allen-Bradley.
page 2
Standard Models
All EC-3000 Series units are housed in NEMA 12 enclosures. All EC-3400 Series units are housed in NEMA 4X
stainless steel enclosures. All units have either right, left,
or double-ended shaft extensions with a #606 Woodruff
Key provision; Nema 4X models have a double-ended
stainless steel shaft. The cover plate on the EC-3400 Series units is secured with clamps to avoid contamination.
Five standard EC-3000 Series and four standard EC-3400
Series models are available:
Model Outputs Standard Shafts*
EC-3004/EC-3404 4 Right, left, or double
EC-3008/EC-3408 8 Right, left, or double
EC-3012/EC-3412 12 Right, left, or double
*See dimensional drawings for shaft illustrations.
Special shafts can be supplied. Please enclose shaft
drawing and specs with your order. All NEMA 4X
units are ONLY available in double-ended shafts.
Model EC-3004-10-ARO
Options
Pulse Generating Discs
Multi-output pulse generating discs are an option offered
for applications requiring multiple outputs per revolution.
These discs are most often used to generate timing pulses
for tachometers, motion detection, glue stitching, or wherever multi-pulse signals are required. Glue stitching patterns on carton and case sealing equipment is an example
of an application that benefits from pulse generating discs.
Standard pulse discs are available with 1, 2, 3, 4, 6, 7, 10,
16, 20, 32, 60, and 64 slots per revolution, allowing for
quick changeover. Pulse generating discs must be ordered
with the unit. The discs are factory mounted on the cam
shaft, and each disc replaces one set of adjustable cams.
See Publication 107B for more detailed information.
Sprocket Disengagement Clutch
The sprocket disengagement clutch is essential in situations where the shaft needs to be easily disconnected from
the sprocket without removing the chain. The clutch not
only allows for disengagement of one station of the machine to check operation without jogging the entire machine, but it simplifies the adjustment of the rotary cam
limit switch. The clutch automatically locks back in the home
position after one revolution. The clutch has a 3/4 inch
bore with the provision for a #606 Woodruff key. There are
five standard and numerous special sprockets
available. See Publication 108B for more detailed information.
External Degree Wheel and Pointer
An internal degree wheel and pointer is included with each
EC-3000 and EC-3400 unit for reference during cam
adjustment. To visually determine shaft position without removing the cover, an optional external degree wheel and
pointer is available. This option must be ordered with the
unit, and requires a double-ended shaft for mounting.
Specify mounting on left- or right-hand shaft (see mounting dimensions), and clockwise or counterclockwise rotation as viewed from end of shaft.
CFX for High Shock / Vibration
For extremely high shock or vibration, such as punch press
applications, a CFX option may be needed on the EC-3000
or EC-3400 units. The CFX option adds clear conformal
coating on both sides of the printed circuit board and removable jumpers replace the DIP switch. The jumpers
eliminate the possibility of intermittent connection to the
DIP switch or the accidental changing of the DIP switch
setting through shock or vibration.
CF for Highly Contaminating Environments
For highly contaminating environments, the CF option may
be ordered with the EC-3000 units. The CF option adds
clear conformal coating to both sides of the printed circuit
board. This option is standard on all EC-3400 units.
page 3
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