Product technical knowledge of electric power industry
What is the cause of excessive wear of AC contactor contacts in a short time
What is the cause of excessive wear of AC contactor in a short time? We sometimes encounter it
AC contactor
The contact is excessively worn in a short time, but I don't know what causes it. Today, Tianzheng Electric will tell you the causes and solutions of the excessive wear of the contact in a short time.
Causes of excessive wear of contact in short time of AC contactor
1. The selection of contactor is improper, and the capacity is insufficient in the following occasions:
(1) reverse braking
(2) there are many close connection operations
(3) the operating frequency is too high
What is the cause of excessive wear of AC contactor contacts in a short time
2. The three-phase contacts do not contact at the same time
3. Load side short circuit
4. The contactor cannot be pulled in reliably
Solution to excessive wear of contact in short time of AC contactor
1. Reduce the capacity of the contactor or use a contactor suitable for heavy tasks
2. Adjust the contact to contact at the same time
3. Remove the short circuit fault and replace the contact
4. See handling method for unreliable action
What if the thermal relay motor burns out and doesn't act
When we encounter a thermal relay
Thermal relay
What if the motor burns out and doesn't act? How to solve it? Many little friends don't know what to do. Today, Tianzheng electric Xiaobian
Causes of motor burnout and non action of thermal relay
1. The setting current of thermal relay is set too high
2. The thermal element of the thermal relay is desoldered or burnt out
3. Action machinery stuck
4. Upper guide out
What if the thermal relay motor burns out and doesn't act
Solution to motor burnout and non action of thermal relay
1. Adjust the setting current value according to the rated working current of the motor
2. Exit the operation and send it to a professional manufacturer for repair
3. Exit the operation and send it to a professional manufacturer for repair
4. Re input and flexibility check
Causes and solutions of phase to phase short circuit of AC contactor
We often encounter phase to phase short circuit of AC contactor. When we encounter this situation, what should we do? Is there nothing we can do? No, no, no, No. today, Tianzheng Electric will tell you about when we encounter it
AC contactor
What should I do when there is a short circuit between phases.
Causes of phase to phase short circuit of AC contactor
1. The interlocking of reversible conversion contactor is unreliable, and the two contactors are put into operation at the same time due to misoperation, resulting in phase to phase short circuit
2. Dust accumulation or water vapor, oil dirt and deterioration of insulation
3. Product parts are damaged (e.g. arc extinguishing cover is broken)
Causes and solutions of phase to phase short circuit of AC contactor
Solution to phase to phase short circuit of AC contactor
1. Check the electrical interlocking and mechanical interlocking; On the control line
Or arc short circuit occurs in the conversion process due to too fast contactor action and short conversion time
Add intermediate link to prolong reversible conversion time
2. Clean frequently and keep clean
3. Replace damaged parts
I hope the above content will help you.
Causes of non release or slow release of AC contactor and Solutions
Do you know the reason why the AC contactor does not release or releases slowly? How can you solve it when you encounter it? Take a look at the possible reasons and solutions you Tianzheng Xiaobian brings to everyone.
AC contactor
AC contactor
Reasons for non release or slow release
1. Contact spring pressure is too small
2. Contact fusion welding
3. The movable part of the machine is stuck, and the rotating shaft is rusted or skewed
4. The reaction spring is damaged
5. There is oil stain or dust on the pole surface of the iron core
6. At the end of the service life of E-shaped iron core, because the demagnetization air gap disappears, the residual magnetism increases, so that the iron core does not release
Causes of non release or slow release of AC contactor and Solutions
Solutions to non release or slow release of AC contactor
1. Adjust contact parameters
2. Eliminate the fusion welding fault and repair or replace the contact
3. Eliminate jamming and repair damaged parts
4. Replace the reaction spring
5. Clean the core polar surface
6. Replace the iron core
You know why the AC contactor does not release or releases slowly and the solutions. You should know how to solve such a problem next time. I hope the above contents will be helpful to you.
What if the contactor doesn't pull in? What's the solution
We're using
AC contactor
It is difficult to ensure that there will be no small faults after a long time, among which the abnormal closing of AC contactor is one of the common faults. Even so, some novice electricians will be at a loss when they encounter this problem and do not know where to start to solve the fault. It doesn't matter. Next, Tianzheng Electric will explain the reasons and solutions for the abnormal closing of the AC contactor. You can also go to Tianzheng Electric's official website for more details!
Generally, there are several reasons why the contactor cannot be closed
Contactor fails to close:
1. The input voltage is too low
2. Insufficient power supply
What if the contactor doesn't pull in? What's the solution
The contactor cannot be closed. Solution:
1. Try to increase the input voltage and reduce the line voltage drop.
2. Increase the capacity of power supply transformer.
Now you know how to solve it. I hope the above content will help you.
Causes of overheating or burning loss of AC contactor coil
What is the cause of AC contactor coil overheating or burning? Do you know? Do you know how to solve this situation? Tianzheng Xiaobian brings us the causes and solutions of AC contactor coil overheating or burning.
Causes of overheating or burning loss of AC contactor coil
1. Supply voltage too high or too low
2. The coil technical parameters (such as rated voltage, frequency, load factor and applicable working system) are inconsistent with the actual service conditions
3. Operating frequency too high
4. Poor coil manufacturing or mechanical damage, insulation damage, etc
5. Special environmental conditions: such as humid air, corrosive gas or high ambient temperature
6. The moving part is stuck
7. The polar surface of AC core is uneven or the demagnetization air gap is too large
8. The double coil of DC operation derived from AC contactor overheats because the normally closed interlocking contact is not released during welding
Solution to overheating or burning of AC contactor coil
1. Adjust the supply voltage
2. Exchange coil or contactor
3. Select other suitable contactors
4. Replace the coil and eliminate the fault causing mechanical damage to the coil
5. Coil with special design
6. Eliminate jamming
7. Remove the polar surface or replace the iron core
8. Adjust the parameters of interlocking contact and replace the burnt coil