Q:Relay, time relay, air switch, leakage switch, air with leakage, circuit breakers ,,, how to understand and distinguish between ah? 100 Relay, time relay, air switch, leakage switch, air with leakage, circuit breakers ,,, how to understand and distinguish between ah? What is the working principle and the role of decibel? The

Time relay and ordinary relay is the difference between the time relay with power or power off when the contact delay closed (or disconnect) function.

Q:Central air conditioning winter switch schedule

Comfortable air conditioning standard is the summer temperature at 24-28oC, relative humidity of 40-65%, the wind speed is not greater than O.3m / time 8 hours is appropriate winter: temperature 18-22oC, relative humidity 40-60%, wind speed is not greater than 0.2m / s. Time 10 hours is appropriate.

Q:I would like to ask, switch lights suitable for when to install it? Can not paint all the latex paint a good re-security, and then paint a job to fill a wall. This will not make the wall flowers? Find the correct installation order!

Bathroom and kitchen loaded with short feet, it is appropriate to use porcelain screw dwarf lamp head. Threaded head of the wiring, the phase line (switch line) should be connected to the center contact terminal, the zero line connected to the threaded terminal.

Q:The role of time relay The Can it be understood as a timer switch?

Time relay and timing switch concept is different from the time relay usually refers to the delay action of the relay, and the timer switch is set to set the time parameters automatically run the relay device.

Q:China's accession to the WTO for so long, how not switch ah? When is the switch?

At present, a total of 253 cities, such as sea, land and air, have been approved by the state. In addition, there are nearly 200 second-class ports approved by the provincial people's government. Undeniably, with China's accession to the WTO trade organizations, to participate in international markets, changes in the rules of the game, China Customs is facing more opportunities and challenges. If you refer to the switch, it means full liberalization, free trade, it is clear that this zero tariff free trade is not common in the world. China's accession to the World Trade Organization negotiations, for the domestic open areas and steps are related to the commitment, China is still gradually set up a free trade zone, such as Shanghai.

Q:Want to use a proximity switch, a time relay, a solenoid valve to control the automatic reciprocating motion of the cylinder.

The solenoid valve controls the reciprocating motion of the cylinder and sends a signal to the solenoid valve through the proximity switch, with the time relay being used.

Q:I produced the power supply is output 12V and 5V two groups. Current is 2A. Will the normal aging time is how much the load should be connected to the number of normal. Please advise experts. Thank you so here.

The initial trial production can be 24 hours of aging, and take 10% of which for a long time aging (at least half a month) to ensure quality. Into the first five batches of 100% load aging 40 minutes, if no problem and then you can use 80% or 100% load aging 25-30 minutes. General power plants are the same operation.

Q:The most common switching circuit Ton-turn-on time open Toff-turn-off time off Ts-storage time Tf-fall time Tr-rise time Td-delay time

Transistor opening, closing, storage, rise, fall time determines the transistor switching speed, but after the conduction of a steady state of the size of the current without much impact. Impact on the switching circuit: All the time parameters will be on the switch circuit response speed, the maximum operating frequency impact, all the parameters are required as small as possible. If the operating frequency is below the following electronic circuit, the basic need not discuss these parameters, the time parameters are mainly for high-frequency circuits such as computers (frequencies generally above 100 MHz) or require precision shaping of the signal circuit will highlight Its influence. Supplementary explanation: The preceding parameters are obtained under the standard test conditions of the component / circuit. Generally, the [step signal], [square wave pulse], the test element / circuit under the action of the signal [response], (through the oscilloscope The resulting waveform) for parametric analysis. Actual work conditions may differ from test conditions.

Q:There is no monitoring software, you can monitor the computer's switching time and operating records

The computer shuts down the monitor does not work: Computer shutdown, it means that the closure of the "monitoring system", so the monitor to stop working; If it is video capture card can not work; Monitoring computer must be 24 hours to boot, it is generally recommended to use a hard disk video recorder.

Q:For example, I use the IGBT circuit switch, using the same gate resistance and drive circuit. Then use it to make a normal working current only 1A off the external circuit off time And let a current up to 100A of the external circuit completely off the turn-off time, Will there be a big difference between the two times? Or that depends entirely on the drive part of the control of the gate G, CE voltage at both ends of the voltage is not much relationship?

Switch with IGBT, the switch time with the load current size does not matter. IGBT can not control the size of the current, IGBT is only a switching device, when connected to the circuit, used to control the circuit off time. IGBT and inductance together to achieve the control of the current. Take the voltage source as an example, only consider the main circuit, voltage source, IGBT, inductance, load series, when the IGBT is turned off, the power and inductance disconnected from the inductor to the load power supply, the inductor current can not be changed, but will decline. When the IGBT is turned on, the power supply and inductance connected to the power supply to the inductor and load power supply, the inductor current can not be mutated, but will rise. The current in the inductor and the rise of how much, by the IGBT turn off and open the time to determine, that is the IGBT turn on and off the law determines the law of the current changes in the inductor, also said that the realization of the current control.