Model MG
Metal Box Controller and Light
Curtain
Features
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Big on Safety - Small in
Size
Diverse Redundancy Design Concept
The MicroGuard® safety light curtain utilizes the diverse redundancy design concept. This gives the
safety light system a higher level of redundancy and control reliability. The two microprocessors
are of different design, and the microprocessor or parallel programs are run and made up from
different instruction sets written by different programmers.
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Self-Checking Circuitry
The MicroGuard® safety light curtain self-checks every 20 milliseconds. Self-checking is the ability to
electronically verify that all of the systems' critical internal circuit components and their redundant
counterparts or back-ups are operating properly.
Extra Safe Design
Provides tow methods of cross monitoring design. One utilizes two microprocessors and two captive contact
relays and the other uses four watchdog timers monitoring the system and the captive contact
relays.
External Diagnostic Message Display
Standard on all MicroGuard® safety light curtains is the "External Diagnostic Message Display"
Extensive Testing
The MicroGuard® safety light curtain incorporates extensive testing and burn-in to establish a high degree of
product reliability and safety.
Redundant Captive Contact Safety
Relays
Redundant relays assure safety if an output relay should fail. The MicroGuard® utilizes safety relays which have
force-guided contacts. This is a configuration where the contacts are mechanically locked together so that if one
set of contacts weld, the other contacts cannot change state. If one should fail, code "Relay Fault" will be
displayed on the diagnostic message display. The complete guarding system consists of two miniature pylons with a
controller for system diagnostics and wiring interface.
Alphanumeric Plain English Messages
Scrolling message display shows status and fault codes of the unit. This is an excellent safety and maintenance
feature which is unparalleled in the machine guarding industry for enhancing machine utilization.
Control Reliable System
Critical components of the MicroGuard® are duplicated so that a single component failure will not cause an unsafe
condition. If a component does fail, the units' self-checking circuitry recognizes the situation and initiates a
safe stop of the machine. The fault is then displayed on the message display.
Powerful Infrared Light Source
The MicroGuard® safety light curtain utilizes powerful, safe, and predictable infrared light as its sensing source.
This gives the system greater reliability and enhances machine utilization by minimizing nuisance trips and
shutdowns caused by dirt, coolants, lubrication mists and machine oils. The MicroGuard® is highly immune to EMI,
RFI, and ambient light conditions and are unaffected by strobe lights and weld flash generated light
sources.
Standard System Features for
Metal Box and DIN-rail Controllers
Pylons
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Heavy duty aluminum extrusions NEMA IV (IP
65)
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Replaceable infrared lens cover
(acrylic)
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Sealed bulkhead positive locking circular
connectors
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Mounting brackets supplied standard
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Emitter Pylon - red/green/yellow status
indicators
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Optional Polycarbonate tube which will encase
the pylons for high impact protection. (Pictured at right)
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Cables
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Shielded PVC 22 AWG cables with quick disconnects and strain
relief fittings
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Emitter cable - 20' (6.1m) supplied standard for the Metal Box
Controller Module and 22' (6.7m) supplied standard for the DIN-rail Controller Module
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Receiver cable - 8' (2.44m) supplied standard for the Metal
box Controller Module and 22' (6.7m) supplied standard for the DIN-rail Controller Module
External Alphanumeric Diagnostic & Status Message
Display
Infrared Light Source: Solid state light emitting
diodes
Beam Spacing: 1/2" (13mm) or 1" (25mm)
Minimum Object Sensitivity
1/2" (12.7mm) beam spacing is .55" (14mm)
1" (25.4mm) beam spacing is 1.18" (30mm)
Response Time: <30 milliseconds (all sizes)
Scanning Frequency: 5.9 Khz
Temperature Range: 32° to 120° F (0° to -51°
C)
Shock tested to withstand high vibration applications
per UL991
Self-Checking every 20 milliseconds
Scanning Distance: All units are supplied standard
with a 20' (6.1m) scanning capability. Extended range units are available, consult your representative or
the factory. Scanning distances must be specified 50' (15.24m) maximum.
Complete Guarding System Supplied: Transmitter and
receiver pylons, controller, mounting brackets, connectors and cables, installation and operation
manual.
CSA Approved, UL Listed, and CE Certified
Two-Year Warranty
Patented #5, 243, 183
Category 4 Safety Device per EN954
DeviceNet™ Fieldbus Network Compatible
(optional)