Our company some time ago into the batch of electrical out of the fault, from time to time abnormal heat how to do, please help you heroes
To confirm whether the relay contact rated current is smaller than the actual operating current?
"solutions"
1. Power supply voltage and coil voltage drop will cause repeated switching and vibration occurs, resulting in abnormal heat. In particular, AC specifications of the relay, the voltage should not be less than 90% of the rated voltage. DC specifications of the relay, the voltage should not be less than 70% of the rated voltage (with the relay model will be somewhat different).
????(Example: motor, etc., the high current in line with the operation of the moment, sometimes resulting in low power supply voltage) Please be careful not to control the relay coil ON / OFF sensors and switches, micro-use of computer malfunction caused by high frequency switch.
2. Exceed the contact rated current:
In order to prevent the current above the rated current above the contact circuit flow, please design the circuit safely.
3. Coil overvoltage application:
Experts answer for you: relay FAQ - abnormal heat
"Fault condition"
1. Due to the repeated switching of the opening and closing of the arc caused by the continuous occurrence of the center of the contact site abnormal heat, there are contact fusing, melting, dissolved curing and other phenomena occur, resulting in poor action. 2. Excessive overcurrent that exceeds the rated current of the contact (also in the case of short-circuit current) will cause the circuit inside the relay to blow and contact the melting and curing phenomenon, resulting in poor operation. 3. Apply overvoltage to the coil will cause the coil to be short-circuited and the coil is broken. There will be traces of abnormal heat traces.
