How to wire the pressure relay and the contactor when installing a pressure tank in a household pres

First of all you should use an electrical contact pressure gauge.

In this way, the effluent condition of the pressure tank can be output.

Connect with 220V instructions: the live wire is connected to the center line of the pressure gauge, and the upper limit contact is connected to the intermediate relay.

One end of the coil of the device, and the other end of the coil of the intermediate relay are connected to the neutral wire. The lower limit contact is connected to the AC contactor.

One end of the coil, the other end of the AC contactor coil is connected to the neutral wire; Another live wire is connected to the normally closed contact of the intermediate relay and the normally open auxiliary contact of the AC contactor (for self-protection), and connected to the inlet end of the AC contactor coil (that is, it is connected in parallel with the lower limit contact). The main contact of the AC contactor is connected to the water pump. Pay attention to adjusting (setting) the upper and lower limits of the pressure gauge.

Logic: There is no pressure in the pressure tank at the beginning, the live wire enters the AC contactor coil through the lower limit contact, the water pump starts, and the self-protection point is connected and maintained at the same time (after the water pump is started, the center live wire of the pressure gauge will leave the lower limit contact); When the upper limit contact is reached, the intermediate relay is turned on, the normally closed point in the loop will be disconnected, the AC contactor will lose power, and the water pump will stop running.

Draw a picture and see if it works. In addition, although the automatic operation is good, it is safer to use the transfer switch and connect a manual start and stop circuit to facilitate the maintenance of the line.

The power supply is connected to one end of the contactor coil, the other end of the coil is connected to the normally closed contact of the pressure relay, and the other end of the normally closed contact is connected to the neutral wire.

AC to copy

The contact coil is 380V, three-phase electric A, B, C, which is introduced into the upper mouth of the contactor through the three-phase air opening, and the lower mouth is connected to the water pump. Power supply A is connected to one end of the coil, the other end of the coil goes to the pressure tank pressure switch long closed contact, and the other end of the long closed contact goes to the upper port of the contactor power supply C.

The main circuit is connected to the pressure tank, and the control circuit (coil) is connected to any two phases of three-phase electricity.

Control the contactor coil with a pressure switch or contact pressure gauge.

The (upper) end of the pressure gauge MP is the upper limit correction needle, the 2 (middle) end is the pressure gauge barometric needle, and the 3 (lower) end is the lower limit correction needle.

The whole water supply pipe network is connected, the pressure in the pressure tank is continuously reduced by external water, when the pressure is lower than the lower limit, the middle and lower meter needles are contacted, the IC-1 output is high, the relay J2 is sucked, the water pump M is running, the "running" indicator light 4 is on, the water pump is injected into the pressure tank, the pressure continues to increase, and the air pressure needle moves up slowly.

When the air pressure needle is in contact with the upper limit, IC-1 flips, relay J2 is released, water pump M stops running, and the "stop" indicator LED3 is on. Outside water, the pressure in the pressure tank continues to drop, when the air pressure needle and the lower limit touch again, repeat the above working process.

The motor output line is not clear. You can use a universal meter to measure the three output lines of the motor in the 100 ohm gear. Swap measurements repeatedly. The two of the largest resistors are connected to the capacitors. If one end of the capacitor is connected to the other live wire and neutral wire, if it is reversed, it will be switched to the other end.

Difference Between Intermediate Relay and AC Contactor:

1. Intermediate relay.

Intermediate relay: used in relay protection and automatic control system to increase the number and capacity of contacts. It is used to transmit intermediate signals in control circuits.

The structure and principle of the intermediate relay are basically the same as that of the AC contactor, and the main difference with the contactor is that the main contact of the contactor can pass through a large current, while the contact of the intermediate relay can only pass a small current. Therefore, it can only be used in control circuits.

It generally does not have a main contact because the overload capacity is relatively small. Therefore, all of the contacts it uses are auxiliary contacts, and there are more of them. The definition of intermediate relay in the new national standard is K, and the old national standard is Ka.

Generally, it is powered by DC power supply. A few use AC power.

2. AC contactor.

AC contactors are widely used as interrupting and control circuits for electricity.

From the perspective of use, AC contactors can be divided into: 1. Industrial contactors.

2. Contactors for construction and household use.

The AC contactor uses the main contact to open and close the circuit, and the auxiliary contact to execute the control command. The main contact generally only has a normally open contact, while the auxiliary contact often has two pairs of normally open and normally closed contacts, and the small contactor is often used as an intermediate relay with the main circuit.

How to connect the pressure switch of the pressure tank 380 with the AC contactor The contactor is divided into AC contactor (voltage AC) and DC contactor (voltage DC), which is used in electricity, distribution and consumption. Contactor in a broad sense refers to the electrical appliances that use the current flowing through the coil to generate a magnetic field and close the contact to control the load in industrial electricity.

In electrical engineering, because it can quickly cut off the AC and DC main circuits and contactors can be frequently connected to high-current control (some types can reach 800 amperes) circuits, so it is often used as a control object for motors It can also be used to control power loads such as factory equipment, electric heaters, machine tools and various power units, and the contactor can not only turn on and off the circuit, but also have a low-voltage release protection effect. The contactor has a large control capacity and is suitable for frequent operation and long-distance control. It is one of the important components in the automatic control system.

In industrial electrical, there are many models of contactors, and the current ranges from 5A to 1000A, and its use is quite extensive.

The requirements are not clear and clear! Are you going to pressure the upper and lower limits to require the start to stop the contactor?