What control requirements does the control cabinet of AC inverter pump need to meet?

The control cabinet of the frequency converter pump needs to meet all the requirements of the feed water process.

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The general variable frequency water supply equipment control system requires that it can realize fully automatic control, with manual automatic switching, regular rotation of main and auxiliary pumps, pressure adjustment, constant pressure, high and low voltage protection, underphase protection, leakage protection, overload protection, overheat protection, water shortage protection, parking and dormancy without water, instantaneous trip protection and other functions. Zibo Boshan Xinjue water supply equipment.

1) Liquid level control: This type of control cabinet is equipped with a key float switch or a high-performance electronic liquid level controller, which can automatically control the start and stop of the pump according to the level of the liquid;

2) Pressure control: This type of control cabinet is equipped with an external electrical contact pressure gauge, the pressure controller or pressure is irrelevant, and can automatically control the start and stop of the pump according to the pressure of the pipe network, and is suitable for control in various places such as float switch, limit switch and button remote control, etc., which is a kind of motor control cabinet with a wide range of "universal interface";

3) Temperature control: The temperature sensor outside the control cabinet can be based on the temperature of the conveyed medium. Automatic control of the start and stop of the pump. It is used in constant temperature, switch group system, etc.;

4) Time control: This type of control cabinet is equipped with a time controller, which can automatically control the start and stop of the pump according to the time sequence preset by the user, and is used for equipment that needs to be controlled regularly;

5) air-conditioning joint control "this type of control cabinet is designed for the air-conditioning water pump, the water pump is started by the operation center control, and the control cabinet outputs a control contact for the refrigeration unit when the pump is running, so as to realize the control according to the program of opening the pump first and opening the refrigeration unit later, so as to ensure the safe operation of the unit;

6) Submersible Sewage Pump Control: According to the characteristics of submersible sewage pump, this type of control cabinet is not only equipped with the main circuit short circuit, gas phase and overload protection, but also designed with the functions of pump body leakage protection and pump motor stator winding overheating protection;

7) Fire control: This type of control cabinet is designed according to the national planning, the start of the fire sprinkler pump can be manually started through the chassis panel, the fire hydrant switch is started, the fire center is started, and the output pump is fed back to the fire center for indication and alarm.

Installation siteThe installation site should meet the following conditions:

l Good indoor ventilation.

l Ambient temperature -10°C 40°C, bare metal is -10°C 50°C.

l Try to avoid high temperature and humidity, the humidity is less than 90%RH, and there is no rain dripping.

l Do not install on flammable objects such as wood.

l Avoid direct sun exposure.

l No flammable, corrosive gases and liquids.

l No dust, oily dust, floating fibers and metal particles.

l The installation foundation is firm and vibration-free.

l No electromagnetic interference, away from interference sources.

Ambient temperature. In order to improve the reliability of the inverter's operation, please install it in a place with good ventilation conditions, and when using it in a closed box, please install a cooling fan or cooling air conditioner to keep the ambient temperature below 40°C.

1) Temperature. The inverter is a high-power electronic component, which is very susceptible to the influence of working temperature, and the product is generally required to be 0 55, but in order to ensure the safety and reliability of the work, there should be room for use when considering, and it is best to control it below 40. In the control box, the inverter should generally be installed in the upper part of the box, and strictly abide by the installation requirements in the product manual, and it is absolutely not allowed to install the heating element or the component that is easy to heat up close to the bottom of the inverter.

2) Humidity. When the humidity is too high and the temperature changes greatly, the inverter is prone to condensation, and its insulation performance will be greatly reduced, and it may even cause a short circuit accident. If necessary, a desiccant and a heater must be added to the box.

3) Corrosive gases. If the concentration of corrosive gas is large in the use environment, it will not only corrode the leads and printed circuit boards of components, but also accelerate the aging of plastic devices and reduce the insulation performance.

4) Vibration and shock. Control cabinets equipped with frequency converters are subjected to mechanical vibrations and shocks, which can cause poor electrical contact. At this time, in addition to improving the mechanical strength of the control cabinet and keeping it away from vibration sources and shock sources, it is also necessary to use anti-seismic rubber pads to fix components such as electromagnetic switches outside and inside the control cabinet that generate vibration.

After the equipment has been running for a period of time, it should be inspected and maintained.

5) Prevent electromagnetic interference. Electric welding machines, power machinery.

6) Keep away from radioactive substances and combustibles.

7) Avoid direct sunlight.

8) Keep away from corrosive liquids and gases.

First, the environment should not be too humid.

Second, it is best to have a good environment without much dust.

Apart from the above two points, there is nothing to pay special attention to. Otherwise, there is no need to use an inverter.