Rockwell Automation 440F MatGuard, 440F-C4000 Mat Controllers User Manual
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5.5 FIXED
GUARDS
The fixed guards should be designed so that access is not possible to the hazard zone other than via
mat system. Guard construction and positioning should be in accordance with EN 953, EN 294 and EN
811.
5.6
GOOD INSTALLATION DESIGN AND MEASURES AGAINST BYPASS
It must not be possible to reach the hazard without standing on the mats.
Access to the hazard zone from positions which do not involve standing on the mats must be prevented.
This will typically require additional angle plates and careful positioning of pipework and trunking. Good
practice in this respect is illustrated in fig. 14.
Fig 14
1.
Fixed guards prevent access to the hazard zone in such a way that there is no access
between the guard and sensors.
2.
A sloping cover plate prevents the operator eluding the sensing area by standing on the
machine base plate.
3.
The tripping hazard at the sensor edge is reduced by a ramp at the point of access. The ramp
may also protect connecting cables. The optional perimeter trim is a ramp section.
4.
Cable trunking is installed outside of the fixed guard. This prevents its misuse as access to the
hazard zone.
5.
A reset button is located in a well protected location giving full visibility of the machine.
6.
Mats are properly installed.
5.7
ELECTRICAL INTERFACING
THE PROTECTION PROVIDED BY THE SYSTEM DEPENDS ON THE CORRECT INTERFACING
BETWEEN THE SYSTEM AND THE MACHINE.
The safety output contacts from the system are arranged as two independent voltage free N/O contact
pairs. The terminal positions are given in section 6.2 and ratings are given in Section 4.
1
2
6
4
5
1
3
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