- It is necessary to regularly clean the dust of the insulation part of the circuit breaker body, so as to ensure that its insulation performance is always in a good state, which is conducive to daily work.
- When maintaining the universal circuit breaker, the contact system should be checked, and the smoke traces on the contacts should be wiped clean. If small metal particles are found on the contact surface of the contacts during the wiping process, it should be timely. Clean it up.
- Finally, since the circuit breaker is in the state of providing protection, it may be subject to short-circuit current. Therefore, in addition to the necessary contact system inspection, it is necessary to clean the smoke marks on both walls of the arc extinguishing cover. If the universal circuit breaker is extinguished If the arc grid is seriously damaged, replace the arc chute immediately.
Common fault 1: The universal circuit breaker cannot complete the energy storage action
Fault cause 1: It may be that manual and electric energy storage cannot be performed, because the energy storage device has a mechanical failure, and the power supply voltage controlled by the electric energy storage device is less than 85% Us.
Remedy 1: If the universal circuit breaker cannot store energy manually, it is caused by the mechanical failure of the energy storage device, so it is recommended to contact the manufacturer for repair or replacement. If the electric energy storage is not possible, check whether the control power supply voltage of the electric energy storage device is greater than 85% Us first to ensure that the data is correct. On the contrary, if there is a fault, it can be determined that it is caused by a mechanical failure. It is also recommended to contact the manufacturer for repair or replacement.
Common fault 2: The universal circuit breaker cannot perform the closing action smoothly
Fault reason 2: It is very likely that the rated working voltage of the undervoltage release is less than 70% Ue.Of course, there are also certain cases that the release control unit has failed, and there is a reset on the intelligent release. There is no reset (that is, the red button sticks out of the panel). If it is a drawer-type universal circuit breaker, it is caused by poor contact of the secondary circuit, and the rated power supply voltage of the closing electromagnet is less than 85% Us. At the same time, the closing electromagnet fault has been damaged, and the mechanical interlocking action will open the circuit. The device is locked.
Remedy 2: First, we can check that the power supply voltage of the undervoltage release must be greater than 85% Ue, and then replace the control unit of the release. Next, press the reset button to reclose, shake the drawer circuit breaker to the ON position and check whether the secondary circuit is energized, then check whether the power supply voltage of the closing solenoid is greater than 85% Ue, and finally replace the closing solenoid Iron and then check the working status of the two mechanically interlocked universal circuit breakers.
Common fault 3: The universal circuit breaker cannot perform the breaking action.
Fault reason 3: This phenomenon occurs due to mechanical failure of the operation, or the control power supply voltage of the shunt release is less than 70% Us, and it is very likely that the release is damaged.
Troubleshooting method 3: Check whether the mechanical operating mechanism has any faults such as crushing and contact the manufacturer. At the same time, check whether the control power supply voltage of the shunt release is greater than 70% Us. If the above methods cannot solve the fault, then it is recommended. Replace the shunt release of the circuit breaker.
Common fault 4: The crank handle of the drawer-type universal circuit breaker cannot be inserted into the equipment smoothly
Fault reason 4: It may be that the guide rail or the main body does not fully enter the cradle.
Remedy 4: Just push the guide rail and body to the end.
Common fault 5: The screen of the intelligent release of the universal circuit breaker cannot display data
Fault reason 5: The trip unit is not connected to the power supply.
Remedy 5: Please check whether the electronic release has been connected to the power supply, if not, connect the control power supply immediately. Cut off the electronic release of the circuit breaker to control the power supply and then send the power supply again. If the fault still exists, it is recommended to contact the manufacturer.
Common fault 6: The fault indicator of the universal circuit breaker is always on
Fault reason 6: The overload fault L indicator is always on.
Remedy 6: You can check the time of the breaking current action through the electronic release, and analyze the specific situation of the auxiliary power grid. If it is overloaded, it is recommended to find and eliminate the overload fault. If the universal circuit breaker does not match the actual operating current and the long-time delay operating current setting value, it is necessary to modify the long-time delay operating current setting value according to the actual operating current to properly match the protection, and then exclude The fault can also be taken by pressing the reset button to reclose the circuit breaker.
Common fault 7: universal circuit breaker breaking fault indicator light is always on
Fault reason 7: Ground fault tripping G indicator is always on.
Remedy 7: Use the electronic release to check the breaking current value and operating time. If there is a ground fault phenomenon, it needs to be solved and eliminated immediately. On the contrary, if there is no ground fault, then the current setting value of the ground fault should be checked. match the actual protection. Then there is the possibility to modify the ground fault current setting value of the release, or to reclose the universal circuit breaker by pressing the reset button on the panel.
