Public case

13

2022-06

How to maintain a PLC control cabinet

The PLC control cabinet refers to a programmable control cabinet, while the control cabinet refers to a set of control cabinets that can control motors and switches. The PLC control cabinet has functions such as overload protection, short circuit protection, and phase loss protection.

2022-06-13

How to maintain a PLC control cabinet

10

2022-06

What configurations are needed inside a PLC control cabinet?

PLC control cabinets play an important role in the industrial field. As the core and soul of industrial construction and production, the existence of PLC control cabinets is indispensable. Although most control cabinets on the market look similar, the internal components and electrical elements can vary significantly.

2022-06-10

What configurations are needed inside a PLC control cabinet?

07

2022-06

Five factors that affect the price of PLC control cabinets

In fact, there is no fixed price for PLC control cabinets in the market, as PLC control cabinets are just a general term for complete control cabinets composed of PLC controllers, and the internal electrical components and functions are not fixed. There are many types of PLC control cabinets in Hunan, including touch screen control cabinets, electrical control cabinets, frequency conversion control cabinets, fire control cabinets, explosion-proof control cabinets, high voltage control cabinets, and pump control cabinets.

2022-06-07

Five factors that affect the price of PLC control cabinets

03

2022-06

What details should be noted for maintenance of the distribution box?

1. The power switching and protection frequency conversion cabinet is equipped with a low-voltage molded case circuit breaker connected to the incoming power supply. In addition to being able to connect and disconnect the circuit, it can also provide short-circuit and overload protection for the circuit and the frequency converter. It can cut off the power supply during protection. 2. Start and stop control functions are set on the frequency conversion cabinet panel, including frequency conversion start and stop buttons, for the operational control of frequency conversion equipment, making it convenient for on-site operation.

2022-06-03

What details should be noted for maintenance of the distribution box?

01

2022-06

The five major factors affecting the use of PLC control cabinets.

The PLC control cabinet is an automatic control device widely used in industries such as medical, water supply for daily life, wastewater treatment, transportation, metallurgy, chemical engineering, agriculture, irrigation, and machinery. The PLC control cabinet has strong reliability, high safety, and strong anti-interference capability.

2022-06-01

The five major factors affecting the use of PLC control cabinets.

29

2022-05

Fault analysis during the use of distribution cabinets

The disadvantages caused by the impact of ambient temperature on low-voltage electrical appliances in distribution cabinets include components such as fuses, AC contactors, residual current devices, capacitors, and measuring instruments. These low-voltage electrical appliances are designed and manufactured according to GB1497 "Basic Standards for Low-Voltage Electrical Appliances," which stipulates the normal operating conditions: the upper limit of ambient air temperature should not exceed 40°C. The average ambient air temperature over 24 hours should not exceed 35°C; the lower limit of ambient air temperature should not be lower than -5°C or -25°C. The distribution cabinets in rural power grid renovation work outdoors, where they are not only exposed to direct sunlight causing high temperatures but also generate heat during operation. Therefore, during the hot summer months, the internal temperature of the cabinet can reach above 60°C, significantly exceeding the environmental temperature limits set for these appliances, leading to failures due to overheating of electrical components inside the distribution cabinet. Failures caused by product quality issues arise during rural power grid renovations due to the large number of required distribution cabinets and short construction periods. The manufacturers of distribution cabinets face urgent demands for low-voltage electrical appliances in large quantities, resulting in a lax approach to product quality. Consequently, some products experience failures shortly after being put into operation. For instance, certain types of AC contactors may fail shortly after the distribution cabinet is commissioned due to burnt-out coil circuits. Failures caused by improper selection of electrical appliances in the distribution cabinet occur because the capacity selection for AC contactors during manufacturing is not very appropriate. Identical capacity AC contactors are used for different outgoing circuits without considering the imbalance of three-phase loads. As a result, some outgoing contactors' current ratings were not upgraded by one level based on normal selection criteria, leading to instances of AC contactor burnout during high-temperature summer operations.

2022-05-29

Fault analysis during the use of distribution cabinets
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