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Rockwell Automation Publication 440G-UM001C-EN-P - June 2019
Chapter 3
Installation
Pair Proximity
Maintain a minimum separation of approximately 200 mm (8 in.) between any
two switches and actuators, as indicated in the following illustration.
Figure 6 - Minimum Required Distance Between Two Switches
This restriction applies to both pairs of 440G-LZ safety switches and
combinations of 440G-LZ safety switches with the TLS-Z guard locking
switches and/or 440N-Z SensaGuard™ noncontact safety switches. All of these
devices use inductive field technology for sensing actuator proximity and
RFID technology for actuator code identification.
Environmental
Considerations
Mounting for Protection from Particle Build-up
Particle build-up in the vicinity of the locking bolt will likely cause jamming of
the locking bolt, which over time causes switch failure. Ferromagnetic metal
particles are especially harmful as they are attracted to the permanent magnet
at the tip of the locking bolt.
Mounting for Protection from Ingress of Liquids
The 440G-LZ safety switch is rated for IP69 in accordance with IEC
60529:192 + A2:2013. This rating involves a short-term test that is made with
high-pressure water jets at 80° C (176° F). The test is passed if no water enters
IMPORTANT
If the minimum separation distance is not observed, the inductive fields
interact causing cross talk. Cross talk results in nuisance faults and false
operation.
200 mm (8 in.)
IMPORTANT
The correct installation is to mount the switch away from any
source of metal particles. Perform preventative maintenance
periodically to keep the switch clean of metallic particles. Pay
particular attention during installation to be sure that any
drilling swarf is excluded from the vicinity of the switch.
