&Nbsp; The detection of time relays mainly includes normal contact detection, coil detection, and coil energization detection&Nbsp&Nbsp&Nbsp&Nbsp; 1. Normal detection of contacts. Contact normal detection refers to detecting the resistance of a contact when the control coil is not powered on. The normally open contact is open, with an infinite resistance, and the normally closed contact is closed, with a resistance close to 0 Ω
&Nbsp&Nbsp&Nbsp; 2. Detection of control coils
&Nbsp&Nbsp&Nbsp; 3. Energize the control coil to detect contacts. Apply rated voltage to the control coil of the time relay, and then detect any changes in the contact state based on the type of time relay. For example, for an energized delay time relay, after the delay time is passed, whether the extended open contact is closed (with a resistance close to 0 Ω) and whether the extended close contact is open (with an infinite resistance)
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