Machinery Protection Devices - British Automation & Robot ...
Machinery Protection Devices - British Automation & Robot ...
Machinery Protection Devices - British Automation & Robot ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Fig. 8: The guard switch100When a single actuator is used to drive the switch it must be of thepositive type, i.e. the actuator is held depressed by the open guard.This is called positive mode actuation.5<strong>Machinery</strong> <strong>Protection</strong><strong>Devices</strong>Guard openGuard closedFig. 9: Positive mode actuation5.0.4.1 Function of a guard monitoring relayThe function of the guard monitoring relay is:a) To monitor itself for functionality and integrityb) To monitor the switches for functionality (opening and closing)c) To monitor the switches for integrity (shorts etc.)d) To monitor the switches for sequence (guard positioning).
Change language