July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH01 0.3D – 115 – [111–115/5]
19.6.2004 9:10PM
The possible faults within the safety relay are:
1. Sticking relay
2. Welded contacts.
Sticking relay
If one of the relays should stick in, then since this is only a single fault, the other relay
will still be able to drop out and hence break the power supply circuit.
Welded contacts
When the emergency stop button is pressed, the circuit is designed to ensure that one
relay will remain energised for a few milli-seconds longer than the other.
The effect of this is that if there is a high level of current flowing into an inductive
circuit then there will be arcing across the first set of contacts to open, which may cause
those contacts
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