Yaskawa Servo Drive SGDV-2R9EP1A

06/29/2020

Suggestions for troubleshooting of compressor with liquid start

06/11/2025

What is a VRV Air Conditioning System

VRV (Variable Refrigerant Volume) air conditioning system was developed and launched by Daikin Industry Co., Ltd. in Japan in 1982. VRV has also become the registered trademark of Daikin variable refrigerant volume multi-split system.

06/20/2020

What are the causes of air conditioning trip

What are the causes of air conditioning trip 1. The contradiction between the rated current of the air conditioner and the current carrying capacity of the wire. 　　Here are two formulas involved: 　　①The rated current of air conditioner I=P÷U ÷power factor, the power remains unchanged, the smaller the voltage, the greater the current required. 　　② The current carrying capacity of the wire I=U÷R, the voltage is proportional to the current. 　　 So when the power supply voltage is normal, we must consider the line voltage drop. The longer the line, the greater the resistance, the greater the voltage drop, and the smaller the output current at the end. However, because the power of the load remains unchanged, the voltage becomes smaller, and the current that needs to be output will be larger. At this time, the wire is forced to overload, and the time will cause heating, and eventually cause the tripping of the open circuit. 　　 Some friends said that the heat of the wire will not cause the tripping of the circuit breaker. In fact, the manufacturer of the air switch has made it clear in the relevant manuals that the heat of the wire will cause the air switch to trip. Because the wire heats up, the crimp terminal will also heat up, and the resistance will become larger and larger. The larger the resistance, the greater the current consumption, and the hotter it will be, a vicious cycle. 　　 2. Leakage 　　During the daily maintenance work, we will encounter the situation that the air circuit trips due to the leakage of electricity. At least I have not experienced it once or twice. Regardless of the leakage of the neutral line or the leakage of the live line, a long time will cause the circuit breaker to trip. 　　Why does the electric leakage cause the MCB to trip? There are two situations. 　　 ① Good grounding. At the beginning, the leakage current was not large, and as time went by, the leakage current became larger and larger, and eventually evolved into a short circuit to ground, unable to close. 　　②There is no ground wire. If the equipment is not connected to the protective ground, when the wire leaks to the equipment, it is equivalent to adding a large shunt resistance. Like this problem, if the air conditioner does not have a ground wire, when the wire leaks to the air conditioner, the air conditioner is a very large shunt resistor and will consume a lot of current. Eventually, the wire will heat up or trip open. 　　How to determine whether the trip caused by the above two aspects can be done with a clamp ammeter. 　　 ① Measure the voltage at the input and output to see if there is a significant change in voltage drop. 　　②Measure whether the output current exceeds the standard. 　　 So my suggestion is: first measure the supply voltage to see if it is within the allowable fluctuation range. Then measure the current to see if it exceeds the rated ampacity of the wire. Finally, check the data one by one according to the measured data to find out the reason.

07/20/2020

Six aspects of repair and maintenance of refrigeration compressors in cold storage

A. During the initial operation of the cold storage unit, carefully observe the oil return of the compressor and keep it clean. If you find that the oil level is not clean enough or if the oil level drops, you should add oil or replace it with new oil in time. This can avoid poor lubrication

09/14/2020

Technical standards for silent oil-free air compressors

Technical standard for silent oil-free air compressor 1. Subject content and scope of use　　 1. This standard specifies the terminology, technical requirements, test methods and inspection rules of silent oil-free air compressors.　

12/24/2022

How do Erbium Doped Fiber Amplifiers Work?

Erbium doped fiber amplifiers are the most widely used optical amplifiers in optical fiber communications.

08/17/2020

Five elements for safe use of liquid ammonia refrigeration equipment

In recent years, liquid ammonia leakage accidents have occurred frequently, leading to many tragedies. In order to prevent similar accidents, the editor of okmarts.com today takes everyone to understand the five major elements that need attention in the u碌7館2䀀締眪湠眷VV㠠ǝ

09/17/2022

Classifications of Air Cylinders

The air cylinder, also known as the pneumatic cylinder, is a cylindrical metal part that makes the piston to perform a reciprocating motion.

07/12/2020

Danfoss

Danfoss was established in Denmark in 1933. It is a global multinational company headquartered in Denmark, and it is a world leader in the manufacturing of refrigeration, heating, water treatment and transmission control. After nearly 70 years of hard work by the company’s employees,

08/13/2022

Introduction of 5 Common Linear Motors

Linear motors (direct drive linear motor), like rotary motors, also have two main application areas: drive and control.