Model CE
Solid State Outputs Global
Safety Light Curtain
Product Overview
The Ultimate
in Safety - Quality - Value -
Worldwide
|
The
Model CE is an infrared safety light curtain
that is designed to the IEC 61496 standard.
When properly installed, it protects the
machine operator by passing an invisible
infrared light beam across an area to be
guarded and examining whether or not the light
beam(s) are blocked. If the light beam(s) are
blocked, monitored solid state outputs will
open, issuing a “STOP” command to the machines
normally closed (N.C.) “STOP” circuit. The
System is composed of a transmitting unit
(EMITTER), and a receiving unit (RECEIVER). The
entire system is control reliable Category 4
(per IEC EN 954-1). A single fault anywhere
within the Model CE will not prevent at least
one of the solid state outputs from opening up,
(allowing a “STOP” command) when either a beam
is broken or an internal fault
occurs.
|
|
|
|
Theory of
operation.
The Model CE
protects an area by projecting a curtain of
infrared light. The infrared emitters and
receivers face each other across the field to
be protected. Each emitter/receiver pair is
spaced along the length of the pylons at
regular intervals from .5" (13mm), up to 8"
(203mm) depending on the application. The
smaller spacing are for finger guarding, the
larger spacing are for body
protection.
The
emitter/receiver pairs are scanned sequentially
(one at a time) by a very short pulse of
infrared light starting from bottom (cable
end), and working up to the top, until every
beam pair has been scanned. Two 16 bit
computers in the emitter pylon and two 16 bit
computers in the receiver pylon control the
operation, as well as cross check each
pylon.
|
The
System.
The Model CE employs infrared
technology in a small sealed NEMA 4 (IP65) aluminum
housing with an infrared passing (daylight filtering)
acrylic lens. This system provides harmless invisible
protection and an unobstructed view of the guarded area.
There are two parts to the Model CE: An Emitter pylon and
a Receiver pylon. The Emitter pylon has no outputs, but
does contain a digital CAN data network to allow it to be
linked to the Receiver pylon (although not required for
operation). The Receiver pylon contains the digital CAN
data network and two monitored solid state 24vdc outputs.
Both pylons are synchronized to each other either via the
CAN data network or electronically.
External Device
Monitoring (EDM).
A method in which the MicroGuard
Model CE Category 4 safety light curtain logic monitors the
state of various external control devices. The control devices
are external and not part of the Model CE light curtain pylons.
A lockout or stop signal will result if an unsafe state is
detected in an external device. The External Device Monitoring
(EDM) is an optional function of the Model CE safety light
curtain for monitoring the status of external devices such as
gate and door switches, safety switches or the main control
element of the drive (MPCE).
Design
Criteria.
----Designed to meet IEC 61496-1
& 2, UL 1998, UL subject 491, OSHA, ANSI, CSA, ANSI-RIA
R15.06-1999
----Microprocessor redundancy for
both Emitter and Receiver pylons
----Redundant, monitored, 24vdc
solid state outputs (PNP)
----Watchdogs on CPU’s and
outputs prevent unintentional output during
lockups.
| 
