Old smoke exhaust fan, forward or reverse
Under normal circumstances, the smoke exhaust fan rotated clockwise to help discharge oil smoke, smoke, etc., while the counter-clockwise rotation was reversed. However, based on the description of the old smoke exhaust fan, it was impossible to determine whether it was rotating forward or backward. It was necessary to further determine whether the direction of rotation was correct by combining its logo, the direction of the fan blades, the condition of the air outlet, the position of the air intake and air outlet, or the actual direction of the airflow. For example, you can check whether the smoke exhaust fan has an indicator indicating the direction of the airflow entrance and exit (such as text, arrows, or graphic labels); Check the direction of the fan blade. The outward curvature of the fan blade usually indicates that the airflow is from the inside to the outside; observe whether the air at the air outlet of the smoke exhaust fan flows outward; or test the airflow direction at the airflow entrance or exit by hand; You can also check the position of the air intake and outlet. Usually, the air intake is located below, the air outlet is located above, and the airflow direction is from bottom to top. Read more exciting novels for free
I'm writing a novel. Is it illegal to mention a smoke exhaust fan in the novel?
It was not illegal to mention smoke exhaust fans in novels because novels were a fictional art form that could not be confused with reality. However, in the real world, smoke exhaust fans were used as supporting facilities in public places to maintain the cleanliness and beauty of the urban environment, as well as to protect the health and safety of the public. If the novel's description of the smoke exhaust fan appears, it may mislead the reader. Therefore, it is necessary to pay attention to the difference between fiction and reality. When writing, it is recommended to avoid content that violates laws and ethics to ensure the fiction and credibility of the novel.
There is no feedback signal from the main engine when the smoke exhaust fan is started.
There may be the following reasons for the lack of feedback signal from the smoke exhaust fan starting host: 1. In terms of modules: - The module may be damaged. You can directly short-circuit the feedback end of the module to see if there is feedback. If there is no feedback, replace the module. If there is feedback, check whether there is any broken line or poor contact between the feedback line and the terminal. - Under the condition that the module and wires are normal, check the circuit and connection between the feedback terminal of the control cabinet and the normally open point of the starting AC contactors. 2. Routes: - Failure to connect or break the circuit between the fan control cabinet and the module will result in no feedback. - Wrong connection of the feedback output terminal will result in no feedback. - If the multi-wire control panel was used to start the feedback, it was necessary to check whether the feedback wire was connected incorrectly. Generally, the wrong connection or the line falling off would cause feedback problems. 3. Contactor: If the smoke exhaust fan's starting feedback is from the electrical control circuit connected to the input and output module, and the normally open auxiliary contact of the main contactors starts the fan after the fan is started, check whether the normally open auxiliary contact of the main contactors is normal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Smoke exhaust valve feedback signal in remote reset state
The feedback signal of the smoke exhaust valve under the remote control reset state refers to the response signal sent to the system when the smoke exhaust valve is in the remote control reset state after the fire control equipment is activated, indicating that the current state of the smoke exhaust valve has been reset. For example, in the smoke control system, when the fire valve and smoke exhaust fire valve are manually closed and reset, or the air supply opening and smoke exhaust opening (valve) are opened and reset, these valve movements must be sensitive and reliable. The signals after opening or closing (including the signals under remote control reset) should be able to receive feedback in the fire control room, which is helpful for the fire control system to monitor and manage the entire smoke control system. At the same time, if the feedback signal of the smoke exhaust valve in the remote reset state was abnormal, such as the feedback of the smoke exhaust valve could not be eliminated, it might be that the air valve in the smoke control system was not in the normal quasi-working state. There were reasons such as being opened or closed by someone, short circuit between the air valve and the module, or module failure. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A novel as good as "Forward in Reverse"
Forward and Reverse Searching of VLOOKING
1. [Forward Search]: - This was the most commonly used function of vlookups, and the formula was: Vlookups (search for values, search for regions, and lock the values in which column, 0/1). There were two points to note here. First, the first column of the search area was the column where the search value was located. Second, 0 meant precise search, and 1 meant rough search. In reality, 0 was often used for precise search. For example, if you want to find the quantity of each product in the seventh month, the formula can be: =VLOOkUP($AA14,$AA6:$AJ10,5,0). - To put it simply, the forward search was to find the data of a later column according to the first column of the search area (the column where the search value was located), such as finding the content of column C according to column B. 2. ** Reverse Search **: - When the search value is at the back of the search area, the normal vlook up will return an error value because the search value is not in the first column. At this time, you can use the reverse search method, the formula is: =VLOOkUP(find value,IF({1,0}, find the column of the value, return the data value),2,0). This formula uses the help of the IF({1,0}, the column where the search value is located, and the return data value). The purpose is to swap the position of the search column and the return column so that the search column is in the first column. For example, when the product is listed in the AK column (after the month), to find the value for July, you can use the formula: =VLOOkUP(AA14,IF({10}, AK7: AK10, AE7: AE10),2,0). - In general, reverse search was to search from right to left by constructing a virtual data column when the search value was not in the first column of the search area. For example, the contents of column A were found according to column B. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What could be the reason for smoke coming out of the exhaust of a cartoon car?
Maybe the engine is malfunctioning. When something goes wrong with the engine, it can cause smoke to come out of the exhaust.
What's going on with the exhaust fan?
There may be the following reasons for the slow activation of the exhaust fan: 1. ** installation problem **: If the product is not installed securely, it may affect the activation and needs to be reinstalled. 2. ** Part Failure **: - The check piece or shutter did not open completely normally. It may be damaged or stuck by foreign objects. Check the check piece or shutter. - The bearings of the motor are worn out. If the ball bearings are corroded and rusted due to prolonged use or harsh working environment, the motor needs to be replaced. - The wind pressure spring had failed. In this case, the wind pressure spring had to be replaced. - The bearing was stuck, causing the thermal protector to burn out. The motor needed to be replaced. - If the motor and wind wheel components are loose, fasten the motor and wind wheel. - The reed of the key switch loses its elasticity and causes poor contact. It can be repaired by replacing the key switch. - If the connection of the motor start-up condense is poor, check the connection. If the connection is broken, re-welding. - The power cord of the motor was not in good contact. Find the location of the bad contact and re-welding it. - If the thermal protector or fuse is burnt out, it should be replaced as soon as possible. - If the key switch is damaged, it can be removed for repair or replaced directly. - The motor's starting transformer was damaged and needed to be replaced. - There was a problem with the fan's impellers. The gap between the fan's impellers and the arc-shaped plates had to be adjusted or the impellers had to be replaced. - If the power socket or plug is not in good contact or the power cord is broken, the plug or socket should be replaced. 3. ** Other questions **: - If the outdoor wind pressure is too high, the thermal protector will burn out. You can install a windproof and rainproof cover outdoors and replace the motor. - The ventilation fan was used for a long time, and there was too much dust on the shutters. The weight was too heavy to open, and the shutters needed to be cleaned. - If the pipe is not connected according to the requirements, the pipe is bent too much or the pressure of the pipe is too high (for loud noise or abnormal sound), the pipe must be connected again. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Forward and Reverse Rotation of the Servo-motor
There are three ways to change the forward and backward rotation of the servo-motor: 1. ** Setting parameters **: If you find that the current rotation direction is different from the required direction, you can change the rotation direction of the servo-motor through the "Setting parameters". 2. ** Pulse signal **: The servo-motor has three control methods: positioning control, immediate control (also known as moment control), and speed control. If it was "positioning control," he would need to change the pulse signal. There were "direction A and B" pulse signals and "direction + pulse" pulse signals. The direction of the pulse could be changed by changing the output signal of the pulse. 3. ** Forward and Reverse Rotation Terminals **: The motor connected to the forward rotation terminal will rotate forward, and the motor connected to the reverse rotation terminal will rotate backward. It should be noted that the reverse rotation of the servo-motor could not be changed by changing the "U, V, W phase sequence" like an ordinary three-phase motor, because the servo-motor was very different from an ordinary motor. The ordinary motor was an open-loop control, while the servo-motor was a real-time feedback. The internal programmer would feedback the current position of the motor. The phase sequence was pre-arranged and could not be modified at will. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The electric fan can be turned into an exhaust fan by reversing
In theory, the reversing of the electric fan could play a similar role as an exhaust fan to a certain extent. If the electric fan was blowing the wind forward when it was running normally, it would change the direction of the wind when it was reversed and suck the air backward. This was similar to the function of the exhaust fan to suck out the air in the room. From the perspective of the reason for the reversal of the electric fan, such as the reverse connection of the main and secondary winding, the change in the magnetic field caused by the change in the phase relationship between the main winding and the secondary winding, or the incorrect installation of the blade, the reversal caused by the damage of the motor, etc., may change the direction of the wind. However, it should be noted that electric fans and professional exhaust fans have differences in design purpose and efficiency. Professional exhaust fans were designed specifically for exhaust. They were more suitable for long-term exhaust work in terms of air volume, wind pressure, protection, etc. Even if the electric fan was reversed for exhaust, the effect and efficiency might be far inferior to professional exhaust fans. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Three-phase induction motor, forward or reverse
It was impossible to determine whether the three-phase induction motor was rotating forward or backward based on the information given, because there was no information about the current connection, phase sequence, or motor operating state of the motor to determine its direction of rotation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>