Dc contactor over-current fault reasons and treatment methods

Publisher： Apollo / 2021-07-01/ Views：1038

Discuss the dc contactor over-current failure reasons and processing methods:

1. The dc contactor over-current failure are discussed

Dc contactor over-current fault can be divided into speed up, slow down, constant speed maximum flow. It will be a converter because the deceleration time is too short, produce sudden changes in load, load dispatch not divide evenly, output short circuit fault reason. At that time generally according to increase deceleration time, reduce the sudden changes in the load, plus energy consumption braking system components, to carry out the design of load dispatch, the route to carry out the inspection. If breaking load frequency converter or over current fault, it shows that frequency converter rectifier circuit has been bad, must be changing a frequency converter.

2. Unipolar dc contactor main parameters, characteristics in detail

Dc contactor load failure

Load failure include dc inverter load and motor load. It would be to speed up the time is too short, because of power grid voltage is too low and too heavy load. General according to increase speed up time, increase the braking system, inspection network operating voltage, etc. Load is too heavy, the selected motor and frequency converter can not drag and drop the load, will also be RunHua mechanical equipment is not so good. As the previous one is sure to changing power of motor and frequency converter; If it is behind a for manufacturing machinery and equipment to carry out the maintenance.

3. The dc contactor fault summary

1, in other words, in the design, installation and application of frequency converter must follow the inverter user manual specific guidance;

2, the electrical design staff, electrical commissioning staff on the spot can be based on the dc contactor with reference to improve the frequency converter.

Since shunt stands motionless transformer excitation regulator system excitation regulator based on semiconductor discrete component to the integration of the solid component, from digital to analog to digital direction development trend. China machinery and equipment can be divided into semiconductor digital to analog excitation regulator, PC (programmable controller) digital excitation regulator and hybrid PC (programmable controller) digital to analog excitation regulator, such as three types. China's semiconductor excitation regulator in early 70 times the total export records. Microcomputer excitation regulator on product research and development work began in 70 at the end of the period.