VLT6000 the frequency of constant pressure water supply cannot be increased?

Constant pressure water supply is the simplest and most classic PID control, the PID control program is programmed in the PLC program, PID control is a closed-loop control in the automatic control theory, that is, the output is based on the given and feedback signal together, for example, we want the water pressure to stabilize in megapascals, which is a given value, the actual pressure of the water pipe is a feedback value, this pressure is achieved by the inverter, and the output frequency of the inverter is an output value; When the feedback value is greater than the given value, that is, when it exceeds the megapascal value, the frequency of the inverter will drop accordingly, so that the water pressure drops; Conversely, when the feedback value is less than a given value, i.e. below megapascals, the frequency of the inverter rises accordingly, causing the water pressure to rise. PID control generally also sets the upper and lower limits of output, that is, the output of the control inverter runs within the lower limit and the upper range, such as 30Hz-50Hz, the general inverter motor can not run infinitely low frequency, and the general inverter motor is not recommended to run below 15Hz, nor is it recommended to exceed 50Hz, so even if the pressure is very different, the output frequency of the inverter will not increase or decrease infinitely.

If the frequency of the inverter mentioned in your question does not rise, if the program is fine, you should check the values of the set value and the feedback value to see if the feedback value is lower than the set value; If there is no problem, see if the output in the PLC is much, whether the output has increased, and the inverter does not respond (communication problem); If it's okay, check the PID parameter in the PLC to see if P is set to be small, or if the integration time is too long? If you check all these places, you can basically find the problem point.

The above are all manually typed by me word by word, I have been typing for a long time, it doesn't matter if it is not, I hope it will help you!

If the frequency of the pressure water supply cannot be increased, then you need to increase its frequency.

I also can't go up the frequency of the red pressure water supply equipment, which means that there is a problem with your pressure switch, only the pressure switch, there is no problem, the pressure is detected to be insufficient, and the frequency can be increased to increase the pressure, you need to check it.

Check whether the maximum frequency is set at 50 Hz, what you say is unstable is the watch hand shaking or the watch hand up and down, if it is jitter, adjust the proportion, differential percentage, less moving a little full trial adjustment,

If the frequency he sets can't go up, then it's probably because of the motor.

The frequency of this water supply device is very powerful.

The frequency of VLT 6000 constant pressure water supply equipment cannot be increased, so you can ask the water supply company whether the air pressure pump is not up and has a fault?

The design frequency of the 600 constant pressure water supply is not up to the card, the pressure value is too small, and the pressure can be increased to go up.

Hello friend, your water supply evaluation can't go up, it may be ** where there is a water leak, but the equipment should be repaired, ** yes, inexplicable.

The main reason, I guess, may be the wattage of the motor or the horsepower is not large enough to cause this reason.

If the frequency of the constant pressure water supply setting does not go up, then it means that your pressure has not been reached, so you should look at this. Is the power supply working?

6 days in Hengyang, the frequency of Hengshui settings can't go up, this should be read more books or something, look for news about this on the Internet.

Such a design is too troublesome, and the general constant pressure water supply is divided into several output frequencies.

For example, there are four pressure values within the frequency conversion starting capacity, after reaching the maximum output pressure is still lower, the starting power frequency, after reaching the minimum frequency of 20Hz output, the pressure from low to MP when the constant speed output of the inverter is 40Hz, if the pressure is not up to the motor power frequency start.

That's how our water pump works, it's relatively simple and it stabilizes the pressure, but if you follow what you say, the frequency of the inverter is never stable, and the pressure of the pipe is not guaranteed. Because the pressure is changing all the time, it's tricky to control.

Constant pressure water supply is the simplest and most classic PID control, the PID control program is programmed in the program, PID control is a closed-loop control in the automatic control theory, that is, the output is based on the given and feedback signals work together, for example, we want the water pressure to stabilize at megapascals, which is a given value, the actual pressure of the water pipe is a feedback value, this pressure is achieved by the inverter, and the output frequency of the inverter is an output value; When the feedback value is greater than the given value, that is, when it exceeds the megapascal value, the frequency of the inverter will drop accordingly, so that the water pressure drops; Conversely, when the feedback value is less than a given value, i.e. below megapascals, the frequency of the inverter rises accordingly, causing the water pressure to rise. PID control generally also sets the upper and lower limits of output, that is, the output of the control inverter runs within the lower limit and the upper range, such as 30Hz-50Hz, the general inverter motor can not run infinitely low frequency, and the general inverter motor is not recommended to run below 15Hz, nor is it recommended to exceed 50Hz, so even if the pressure is very different, the output frequency of the inverter will not increase or decrease infinitely.

If the frequency of the inverter mentioned in your question does not rise, if the program is fine, you should check the values of the set value and the feedback value to see if the feedback value is lower than the set value; If there is no problem, see if the output in the PLC is much, whether the output has increased, and the inverter does not respond (communication problem); If it's okay, check the PID parameter in the PLC to see if P is set to be small, or if the integration time is too long? If you check all these places, you can basically find the problem point.

The above are all manually entered by me word by word, and I have been playing for a long time, and it doesn't matter whether I adopt it or not, I hope it will help you!

There may be a problem with the auxiliary contact of the BAI contactor, but the DU can be connected virtually, causing the FWD and Zhicm to be blocked, and it is also possible that the DAO is the pressure transmitter is disconnected.

Variable frequency constant pressure water supply equipment is a new type of energy-saving water supply equipment. Variable frequency constant pressure water supply equipment is a mechatronics high-tech energy-saving water supply device that combines a variable frequency governor and a motor pump by using the most advanced microcomputer control technology today.

Problems with pid parameter setting p is too small.

They're stupid people who do that.

Feedback signals are divided into positive feedback and negative feedback. In the constant pressure water supply frequency conversion control system, in order to maintain the constant pressure control, the negative feedback mode is generally used for control, that is to say, the pressure signal sensor installed on the pipeline is fed back to the frequency converter and compared with the target set value, if the feedback signal is less than the target signal, the frequency converter is controlled to increase the frequency, and after the feedback signal is greater than the target setting signal, the frequency converter is controlled to carry out frequency reduction operation, and when the feedback value and the target value are equal or basically equal, a relatively constant frequency operation is maintained, and the constant pressure is carried out. It is necessary to set p (proportional), i (integral) d (derivative) three values for reasonable configuration, in order to achieve a stable pid operation effect, otherwise there will be ** and overshoot phenomenon, can not achieve voltage stabilization control, the water supply industry generally only needs to adjust pi can be fully debugged to achieve a perfect constant pressure control effect.

If the remote pressure gauge control mode is used, because it is an adjustable resistor, sometimes when the two ends of the pressure gauge resistance are reversed, because the signal received by the inverter is the signal converted from the resistance of the range minus the actual pressure, the inverter needs to use the positive feedback mode to set the control mode of PID.

PID = PortID, if the BID and PathCost are the same in the BPDU received by the port in STP (Spanning Tree Protocol), the PID is compared to select the blocked port. The digital TV multiplexing system noun PID (packetidentifier) is like the file name of a file in the digital TV multiplexing system, we can call it "flag code transmission package". The full English name of PID (proportion-integral differentiation) in engineering control and mathematical physics is proportionintegrationdifferentiation, which is a mathematical physics term.

The PID consists of an 8-bit port priority followed by a port number, with the port number accounting for the lowest bit, and the default port number priority is 128.

Doesn't the inverter have a PID PLC PID Your PID and time have to be adjusted Suppose you use the analog current no-load test Then the signal feedback is very fast Now the actual feedback is very slow You can observe the site for a while Now there is no pressure gauge in the waterway? You see if the frequency does not decrease because the actual pressure on the site has not come down.

The constant pressure water supply pressure is maintained in the following aspects:

1. The design head and flow rate of the water supply equipment itself.

2. The pressure of the outlet set by the constant pressure water supply controller.

3. The service life of the equipment.

4. Whether there is air in the pump body.

5. Observe whether the motor is reversed, and whether the check valve and valve of the outlet are fully opened.

According to the above reason analysis: first exclude point 4.

1. Turn the pump control switch to the manual, pressurize it in the manual state, and observe whether it can be pressurized to the set pressure. If the design pressure can be reached, the possible reason is that the pressure set by the system cannot meet the actual pressure of the water. Solution: Adjust the pressure setting value of constant pressure water supply.

2. In the automatic operation state, observe the operating frequency of the inverter, if the motor operating frequency is 50Hz, it is still less than the design pressure. In the case that the motor does not reverse and the check valve and valve are fully opened, the possible reason is that the flow rate and head of the pump design cannot meet the flow rate and head of the current actual water use (under normal circumstances, the flow rate cannot be satisfied). Workaround:

Replace water supply equipment.

3. If it is a water supply equipment with 1 with 2 backups, during operation, only one of the equipment has insufficient water supply pressure, and the rest of the equipment is normal, which may be due to the wear of the pump impeller of the faulty equipment. Solution: Replace the worn impeller or replace the water pump.

4. Other reasons: because a large part of the water supply pipe network will be buried underground, there may also be leakage in the pipe network, loss of pressure and water volume. It will also cause the water supply pressure to not reach the set pressure.

Possible causes:

1. The leakage of the check valve is too serious;

2. After the variable frequency water supply reaches the set pressure, it will run at a certain frequency value for a while, if the voltage can be stabilized when this frequency is running, then the controller will consider starting to reduce the frequency until it sleeps. If you haven't hibernate at this frequency, it may be that the set hibernation frequency is much higher than the current operating frequency. If you don't have the function to automatically track the sleep frequency, you can close the water outlet and completely simulate the time when the water is not used, and find out the frequency that runs when the pressure value is reached, and the sleep frequency is slightly higher or equal than this.

Of course, different controllers may be slightly different.

You set the lowest frequency to 0, so the motor won't rotate above the set pressure. The minimum frequency can be set to 5-10Hz.

It is also possible that the head of the pump is not reached, and the pump is running at full speed.

That's how it should be, otherwise it won't be called frequency conversion.

This problem should first be understood in detail about the PID application parameter setting of the manual, adjust the relationship between p and i, p is the bandwidth, is the response accuracy, i is the integration time, is the reaction speed, appropriate adjustment can solve the problem, and then the details depend on what brand of inverter, the right medicine.

Mainly set the speed and power of the pump. Acceleration and deceleration time, the lower limit of frequency (generally 25Hz), and the upper limit of frequency 50Hz (China). There is also working pressure, protection pressure (automatic pump stop when the set pressure is exceeded).

Variable frequency constant pressure water supply refers to the water supply method in which the outlet pressure remains unchanged when the water consumption in the water supply network changes. The outlet pressure value of the water supply network is determined according to the needs of the user. The traditional constant pressure water supply method is realized by using water towers, high water level tanks, air pressure tanks and other facilities.

Since they all have constant pressure water supply controllers, look at their manuals.

Generally, the analog output is set, and the inverter is set to the analog input.

Twin pumps, it depends on what the controller looks like.

The parameters of different constant pressure water supply inverters are different, it is recommended to get instructions with manufacturers or sellers, our Danfrai inverters generally have random instructions, and there are also special technical personnel to guide, if it is our inverter can be contacted.

Is it a one-use-one-ready?

First of all, the inverter needs to adjust several parameters.

1. The inverter receives 0-10V voltage.

2. The inverter needs to be controlled by an external terminal.

Water supply controllers.

001 tune 24 (24 hours reverse pump).

003 tune 01 one use and one backup.

If it's a single pump, you put the pressure sensor signal into the negative end of the PID, give the value to the positive end of the PID, then d=0, and the output of the PID to the inverter at a given frequency.