The safety relay disconnects the circuit in use, and at this time, the safety relay is broken, or the safety relay detects unsafe factors and disconnects the circuit, and it is necessary to make an accurate judgment.
1. If there is a potential safety hazard in the circuit, after eliminating the hidden danger, restart the safety relay and restore the circuit. For example, the SIS system pulse detection causes the safety relay to be frequently disconnected and started, and the duration of the SIS system pulse detection low level is adjusted so that the time will not be recognized by the safety relay.
2. If the safety relay is faulty, it is usually dealt with as follows:
a. The output contact of the safety relay is generally protected by a contact fuse, and during use, the fuse may be blown due to short circuit or overcurrent, and the safety relay cannot start the field device. Action: Replace the fuse.
b. The internal components of the safety relay control circuit are damaged due to overvoltage. Measures: Replace the safety relay, contact the manufacturer, and repair or replace.
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