Electrical Parts Voltage circuit breaker fault contact overheating, can smell the distribution control cabinet has a taste, after checking the moving contact is not fully inserted into the static contact, contact pressure is not enough, resulting in switch capacity decline, causing the contact overheating. At this time to adjust the operating mechanism, so that the dynamic contact completely inserted into the static contact.
When the power arc flashing sound, the inspection is the long-term heavy load, contact loose caused by poor contact. Maintenance of this fault must pay attention to safety,Electrical Parts to prevent the arc on the human and equipment hazards.
After the maintenance of the load and contact, the first no-load power is normal, to take the load to check the operation until normal.
This failure must pay attention to the daily maintenance of the equipment, so as not to cause unnecessary harm
2 contactor failure
Contact phase, due to a contact with a good contact or screw on the terminal pin loose, so that the motor phase to run, then the motor can turn, but issued a buzz. Should immediately stop maintenance.
Contact welding, then "stop" button,Electrical Parts the motor does not stop, and may be issued a buzz. This type of failure is a two-phase or three-phase contact due to the overload current caused by welding phenomenon, should immediately power, check the load after the replacement contactor.
The armature does not catch. If you check the power without vibration and noise,Electrical Parts then the armature part of the movement along the stuck, but the coil circuit failure. Can be removed by the original coil rewinding around the system after the dip paint drying.
AC contactor frequently jump, auxiliary contact caused by poor, or auxiliary contact in the contactor does not connect after the pull, or is wrong with the auxiliary contact, resulting in the loop can not be maintained.
1. you check whether the AC contactor voltage is reached;
2. Whether the wiring is loose; auxiliary contact (self-protection contact) connector is loose;
3. If these are normal, there is a problem with the contactor, the contactor removed, check the E-type iron is the problem, or something inside the stuck
3 thermal relay failure
Thermal relay refused to action
Thermal relay and motor and other equipment does not match. Rated technical value is too large or not suitable, resulting in thermal relay refused to move. The rated technical parameters should be re-selected.
Thermal relay external wiring screw virtual connection, Weld. Should be all the wiring after the inspection and then take the real
Action current setting value is too large, should be reasonable to lower the set value or replace the rated current to meet the requirements of the thermal relay.
Due to load side short circuit or load current is too large. Repeated short-term operating frequency is too high or mechanical failure, so that the thermal relay can not move, resulting in hot components blown or desalination refused to move. Replace the new thermal relay,Electrical Parts or select a thermal relay with a speed-saturated current transformer.
Disrepair, resulting in mechanical action agencies and bakelite parts wear. Dust rust or deformation or even stuck. Should be adjusted to adjust, but should prevent the thermal relay operating characteristics change.
The thermal relay guide is released and should be re-placed and checked for flexibility.
Thermal relay installation is not specified or the temperature of the thermal relay and the ambient temperature of the protected equipment is too large. The appropriate thermal relay should be configured at two temperature differences.
Thermal relay used for a long time,Electrical Parts it should regularly check its operational reliability. When the thermal relay action trip, should be bimetallic cooling and then reset. Press the reset button force can not be too much, otherwise it will damage the operating mechanism.