NITV3000 series electric air proportional valve

Introduction to electric proportional valve:

 

NNT electric proportional valve is based on the size of the control signal to adjust the area of the valve core. In order to achieve the flow regulation of the size of the process objectives and requirements.

 

Electric proportional valve flow control can be divided into two types. One is the switch control, one is the continuous control, servo valve and other valve is different, its energy loss is bigger, because it needs a certain flow rate to maintain the work of the pre-control oil circuit. One is the switch control: or all open, or all closed, flow or maximum, or minimum, no intermediate state, such as the ordinary solenoid valve, solenoid directional valve, electro-hydraulic directional valve. The other is continuous control: valve mouth can be opened according to the need of any degree, thus controlling the flow through the size, this kind of valve has manual control, such as throttle valve, also has electronic control, such as proportional valve, servo valve. The electric proportional valve controls the gas pressure through the electrical signal, may realize the gas pressure the continuous, the stepless adjustment, may realize the remote control and the program control, for needs to carry on the continuous or the stepless adjustment to the gas pressure the occasion, is specially suitable for the electric proportional valve.

 

 

Advantages of electric proportional valve:

 

 

1) electric proportional mode, realizing the poleless control of outlet pressure.

 

 

2) can achieve remote control and program control.

 

 

3) compared with intermittent control, the system is simplified and the components are greatly reduced.

 

 

4) compared with the hydraulic proportional valve, it is small in size, light in weight, compact in structure, light in weight and low in cost, but its response speed is much slower than the hydraulic system, and it is also sensitive to the change of load.

 

 

5) low power consumption: below 4W (communication form).

 

 

6) no fire, no pollution. It is less affected by temperature changes.

 

 

Pneumatic proportional valve in the use of common problems

 

 

We are considering NITV2000 or 3000 series NNT proportional valves. If only predetermined pressure is output, which type is appropriate?

 

 

NITV series electrical proportional valves are standard with 4 or 16 point preset inputs. The 4-point preset input type can output up to 4 points through the ON/OFF combination of 2-point input signals. The 16-point preset input type can output up to 16 points through the ON/OFF combination of the 4-point input signal.

 

 

Ii. What is the resolution of NITV2010 series NNT proportional valves?

 

 

The resolution is "sensitivity below 0.2%F.S." in the specification column of the sample. When NITV2010 is at full range, 100kPa corresponds to 0.2kpa below 0.2%.

 

 

Nitv 20/30 series proportional valve M5 on the upper left side of the thread hole is what?

 

 

The hole is the exhaust hole of the solenoid valve, please open the air for use.

 

If the plug, pressure gauge will not work properly. (NITV10** is upper left M3 thread hole)

 

 

4. It is recorded in the imoto notes of NITV series NNT proportional valve that the power supply will be cut off under control to maintain the output side pressure for a certain period of time. Why?

 

 

Under the control state, shut off the power supply, supply and exhaust valves are closed.

 

 

Therefore, at this time, the pressure in the pilot chamber remains unchanged, so that the output pressure of the secondary side will also remain near the set pressure. However, this state can only be maintained for a period of time, not for a long time.

 

 

Nitv2030-222bs NNT proportional valve Er.1 is what error, what is the countermeasures?

 

 

When the input specification of the product is DC0 ~ 5V, when the input signal exceeds 5V, that is, the input signal is too large, there will be an Er.1 alarm. The countermeasure is to confirm whether the input signal is within the rated range. After adjusting the input signal, restart the power supply to eliminate the Er.1 alarm.

 

 

NITV1000 ~ 3000 series NNT proportional valve power cord in addition to the standard 3m length, what other length?

 

 

The power cables are 1, 3, 5, 6, 7, 8, 10m long. For example, when purchasing 10m, the model of straight head is p398020-500-10, and the model of elbow is p398020-501-10. When choosing 3m straight head connector, the model is p398020-500-3. Note: the DeviceNet specification has different power cable models

 

 

NITV series NNT proportional valve keeps beeping. What is the reason? The power supply has been ON, and the compressed air and input signal have not been given.

 

 

ITV has built-in solenoid valve for supply and exhaust, which is controlled by pulse. When the set pressure is different from the actual pressure, the solenoid valve will continue to work on-off until the set pressure is reached. The buzzer in question is the actuating sound of the solenoid valve. When cutting OFF the air source, please turn OFF the power supply, otherwise the on-off action of the solenoid valve will reduce its service life. (when the air source pressure is cut off, the supply valve/exhaust valve will continue to work in order to reach the atmospheric pressure when the zero of NITV deviates from the ambient atmospheric pressure, even if the input signal is 0%.)

 

 

Electrical proportional valve notes

 

 

1, before the electrical proportional valve, should be set up below 5 m filtration accuracy and oil mist separator, to ensure that the air source treatment system to meet the requirements of compressed air purification system, to NITV proportional valve to provide clean and dry compressed air, in order to achieve the NITV electrical proportional valve should have a variety of characteristics.

 

 

2. Do not install oil mist before NITV electric proportional valve.

 

 

A. ITV electric proportional valve cuts off the power supply in the pressurized state. The outlet pressure can be maintained temporarily, but cannot be maintained continuously.

 

 

B. ITV electric proportional valve is in the control state. Due to power failure, the outlet pressure can be maintained for one time. In addition, when the outlet is opened to the atmosphere, the pressure will continue to drop until the atmospheric pressure

 

 

C. when the proportional valve of ITV electric is energized, if the supply pressure is cut off, the solenoid valve will still operate, which will generate a buzzing sound and reduce the service life. Therefore, the power supply must be cut off when the air source is cut off.

 

 

There will be residual pressure below 0.005mpa at the outlet side of the electrical proportional valve. In order to completely reduce to 0, the outlet should be equipped with a three-way valve to discharge residual pressure.

 

 

NNT electric proportional valve setting method:

 

 

 

 

After performing the key operation according to the operation sequence, be sure to press the SET key.

 

 

1. Release the key lock according to the release method of key lock.

 

Please press the SET key.

 

 

2. The setting of the minimum pressure, with the "delta" button, the "grand" button set the hope of the minimum pressure value. Please press the SET key.

 

 

3. Maximum pressure setting

 

 

Use the "delta" and "grand" buttons to set the maximum pressure. Please press the SET key. Return to the current pressure display and set the end.

 

 

Commissioning method of electric proportional valve:

 

Turn on the air supply first, then turn on the power. The first step is to perform the retrieval, because the NITV is locked after the power is turned on, long press until the screen Loc flicker, press set key to confirm the UNL retrieval is completed, and the screen appears 0.00.

 

 

Press set to confirm to enter the second step, the minimum pressure setting, the screen shows F_1 and its pressure value 0.00 flashing alternately, press the up and down button to select the required pressure, the minimum pressure setting value must be between 0% and 50% of the whole range, set to 0.1mpa. Press the set key to confirm that, at this point, NITV has entered the minimum pressure value of 0.1mpa just set, even though there is no input signal

 

Step 3: set the maximum pressure. The screen displays F_2 and its pressure value flashing. Press the up and down button to select the required pressure. Press set to confirm,

 

It is particularly noted that once the set button of F_1 and F_2 is set, ITV will start working in accordance with the set value immediately. If there is any wrong operation during the operation, the power will be cut off and the setting will be started after the power is reconnected.

 

 

Wiring method of NNT electric proportional valve is as follows:

 

I used the analog quantity input terminal (monitoring the output pressure) before, the M of the analog quantity module should be short connected to the M terminal of the CPU sensor power supply itself.