Siemens PLC 505-7202

07/31/2020

Why is it forbidden to use the refrigerator

We all know that with the continuous improvement of people’s material living standards, every household now has a refrigerator. The refrigerator is very useful in the home, especially in summer.

08/09/2020

Leak detection, drainage, and vacuum operation methods of the refrigeration system in the computer room

The refrigeration system is indispensable for the computer room. Leak detection, sewage discharge, and vacuuming in the refrigeration system protect the refrigeration system so as to prevent the dirt in the system from entering the compressor and throttle valve

01/24/2022

Factors to Consider When Selecting a Pressure Transmitter with the Diaphragm Seal System

The transmitter with a diaphragm seal system is composed of a diaphragm seal system, the capillary and filling liquid.

07/07/2020

Earth Hour: Hitachi Central Air Conditioner works with you to speak for the earth

03/04/2021

Advantages of servo motor

Precision: the closed-loop control of position, speed and torque, and the problem of out of step of stepping motor is solved; Speed: high speed performance, general rated speed can reach 2000 ~ 3000 rpm;

01/02/2025

FANUC Spindle Amplifier Alarm Codes and Solutions (3)

The following is a continuation of the previous article, and introduces FANUC spindle drive alarm codes 47-73.

08/21/2020

How to clean the precision air conditioner in the standby room

The precision air conditioner in the computer room is the guarantee of constant temperature and humidity in the data center of the computer room. To ensure the reliability and economy of the operation of the computer room

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.

08/16/2020

Correct disposal method after leakage of ammonia refrigeration system

1. Treatment method of ammonia leakage accident in ammonia compressor 1. After an ammonia leakage accident occurs in the ammonia compressor, first cut off the compressor power supply and immediately close the exhaust valve and suction valve (two-stage

09/08/2020

Energy-saving way of air compressor inverter

The energy-saving measures for frequency converters mainly reflect the use of current fans, pumps, and hoists. In order to ensure the reliability of production, all kinds of production machinery have a certain margin when they are equipped with power drives.