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Connection of pressure switch pm 5 3w. Correct connection of the water pressure switch to the submersible water intake pump. Connecting the pump to the network

Good afternoon, dear readers of the blog site

In the heading "Accessories" we will consider a pressure switch that controls the operation of automatic pumping stations, as well as surface , or , if used in conjunction with. Via pressure switch you can set up an autonomous water supply system, irrigation system or fire extinguishing system for the required tasks.On sale are pressure switch RM-5, RM-5G, RM-12 produced by an Italian companyItaltecnica.The main difference of the product RM-5 from RM-5G in that the latter uses a union nut with a connecting size of 1/4″. Relay RM-5G is more convenient for installation.

The main characteristics of RM-5 and RM-12 are shown in Table 1.

Characteristics RM-5 RM-12
1. Operating pressure range (bar) 1-5 3-12
2. Factory setting of cut-in and cut-out pressure (bar) 1,4-2,8 5-7
3. Minimum differential pressure (bar) 0,6 1,5
4. Working environment temperature up to (°С) 55 55
5. Maximum operating current (amps) 16 (10) 16 (10)
6. Voltage (volt) 250 250
7. Connection internal thread(inch) 1/4 1/4

Table 1

Note: When using a pressure switch to control pumping equipment, the maximum switching current is 10 A.

Recently, the product RM-5G (25 A) with maximum switching current to control pumping equipment constituting 16 A.

Relay design

Structurally, the relay is assembled in a plastic case and closed with a lid. Figure 1 shows the main elements. To remove the top cover from the product, use a slotted screwdriver to unscrew the plastic plug at its end.

Pressure switch device

1. Case - all elements of the pressure switch are located on it;

2. Connecting flange, used to connect the automation to the water supply system. Connecting size of the flange - internal thread size 1/4″. The flange contains the working chamber and the membrane. The flange and membrane are attached to the relay body with four screws;

3. Nut for adjusting the pressure difference ΔР between the on and off pressure. The more we compress the spring (tighten the nut), the greater this difference will be;

4. Nut for adjusting the switch off pressure. When the nut is tightened, the cut-off pressure will increase, and when the nut is loosened, it will decrease. The top cover is also attached to this rod with a plastic stopper;

5, 6. Terminals for connecting electrical wires;

7. Terminals for connecting ground wires from the mains and motor;

8. Couplings for clamping cables, used for rigid fixing of the mains cable and motor connection cable.

Wiring diagram for pressure switch

On Fig. 2 is a diagram electrical connection relay RM-5, RM-5G, RM-12.

Connection diagram for pressure switches PM-5, RM-5G, RM-12.

The scheme for connecting the relay to the electrical network is very simple. Wires are connected to terminals 5, 6 (see Fig. 1). Moreover, it does not matter which pair of terminals is input (connection ~ 220 V.), and which is output (connection to the engine). After connecting the wires, make sure that they are in good contact with the relay terminals; if necessary, tighten the contacts.

Operation, maintenance and adjustment of the relay

Pressure switch RM-5, RM-5G, RM-12 are very simple and reliable control devices for an autonomous water supply system. If the operating conditions are observed, they work without failures and failures for a long time and reliably. However, given the quality of our water, voltage fluctuations or high humidity, malfunctions occur. Improper operation of automation, as a rule, leads to failure of the pump.

Let's consider the most common cases.

Hard water. In case of hard water or in water with a high iron content during operation, a gradual “overgrowth” of the passage to the working chamber occurs, or the chamber itself overgrows. The diameter of the passage is small 5–5.5 mm. There may come a time when the relay does not turn on or vice versa does not turn off. To eliminate this defect, you need to clean the passage or the chamber itself by following these steps:

  1. Disconnect the product from the mains.
  2. Relieve excess pressure by opening the tap.
  3. If the automation is RM-5G, then with the help of open end wrench 17 unscrew the union nut and remove the relay. If the automation is RM-5, then it is necessary to remove the cover from the pressure switch by unscrewing the plug of the fixing cover with a slotted screwdriver, disconnect the cables from terminals 5, 6 and ground (Fig. 1), loosen the cable glands, disconnect the cables from the product using a wrench 17 unscrew and remove the relay.
  4. Using a match or other blunt object, clear the clogged passage. You need to clean it carefully for two reasons: the first is that water can splash from the working chamber and the second reason is not to damage the rubber membrane. To clean the working chamber, unscrew the four screws securing the flange to the relay housing. Remove the flange and membrane (do not lose a special “penny” during disassembly - a round metal plate with two ears), rinse and clean the flange and membrane.
  5. Reassemble in reverse order. If the automation is RM-5, then before installation, it is necessary to seal the thread with fum tape or a special sealant.

Increased humidity. Very often, the station or automation is located in the pit. Lack of adequate ventilation leads to high humidity, and humidity leads to oxidation and burning of contacts in the pressure switch. In this case, the automation starts to work unstably, turns on with a delay, or it turns on when you lightly tap on the case. If, when removing the cover, there is moisture on the surface of the product, and there are traces of white plaque on the metal parts, then there is a high probability that the contacts are burnt. To repair such defects, you must contact the nearest service center, or call a service technician at the installation site of the station or automation.

Voltage fluctuations also lead to unstable operation of the pressure switch. electrical network and entry into the water supply system.

Pressure regulation. Two adjusting nuts and springs are designed to adjust the pressure (Fig. 1). Nut 4 and a large spring can be used to adjust the cut-off pressure of the system. The more we compress the spring, the greater the pressure in the system will turn off the automation. One of the most common causes of non-stop operation of the pump is the incorrect setting of the pressure switch. Before setting up the automation, you need to look at the operating parameters of the pump, namely, what is the maximum pressure it produces. For example: the pump delivers a maximum head of 40 meters of water column or 4 bar (atmosphere). Theoretically, the maximum relay setting pressure can be 4 bar, but, given the mains voltage fluctuations, the gradual wear of the equipment, the maximum pressure for which we can set the automation is no more than 3.4–3.5 bar. Using nut 3 and a small spring, we adjust the difference ΔР between the pressure on and off the pump. The more we compress the spring, the greater the difference between turning the pump on and off. The smallest difference between the pressure on and off the pump is 0.6 bar for the RM-5 and 1.5 bar for the RM-12 relay - this is when the small spring is completely released. On the one hand, the difference between the switch-on and switch-off pressures must be set as small as possible in order to reduce pressure drops. On the other hand, with a minimum range, the number of pump on and off increases, this problem is solved by increasing the volume of the accumulator. For optimal operation of pumping equipment and autonomous plumbing system it is necessary to choose a middle ground between the pressure on and off the pump and the volume of the accumulator. In addition, you can see how to set up and adjust the pressure switch. If you have any questions, please write in the comments.

Thank you for your attention.

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Good day. Consider the connection diagram of the mechanical pressure switch PM / 5 to the network and the pump. Let's look at the diagram first.

When you unscrew the top cover, you will see the following. First, a large screw with a spring for . It is marked with a capital "P". The second is a small screw with a spring to adjust the difference of this parameter in the on and off mode. It has the name "delta P". Next are two terminals for connecting the electrical wire, called the word "motor". Two - "line". Below - two for ground connection. This view has PM/5 inside. The pressure switch is sold inexpensively in this Chinese store.

Connecting the pump to the network

How can we connect the pump to the pressure switch and the mains? There are three wires coming out of it. different color. Blue is a zero worker or simply "zero". Brown - "phase". Yellow-green - zero protective or simply "Earth".

Now let's see how they will "enter" the relay and how to "exit" it. We push all three wires through a special hole in the case. We connect. Brown and blue into terminals labeled "motor". Yellow-green to ground. Then we bring the same wires to the power plug. Brown and blue, respectively, from the “line” terminals (network). Yellow-green from ground. Everything is ready. The PM/5 pressure switch is connected to the pump and to the mains.

More circuit diagram connection of the pressure switch and everything connected with it, we have considered.

So, as you can see from the diagram, a three-core power cable of a single-phase network is connected to the pressure switch(phase, zero and ground), and a similar cable is already coming out of the relay to the pump that pumps water into the system. There are, of course, three-phase appliances and a water pressure switch used appropriately, but in everyday life a single-phase one is usually enough.

In the water supply of a private house, single-phase surface or submersible pumps are most often used, pumping water from a well or well. The electrical power of pumps varies greatly depending on the required performance of a particular device in specific working conditions.


Usually, the power of such a household pump does not exceed 1.5-2 kW, respectively, to connect it, a cable with a core cross section of 1.5 sq. Mm is required. and 10 amp line circuit breaker.

Connecting the pressure switch to the mains is usually accepted in one of two ways., each with its own strengths and weaknesses:

1. Near the installation site of the pressure switch, on the wall, mounted electric outlet, for him. A cable with an electrical plug at the end is connected to the relay itself.

This is a universal, most often the most convenient, connection option. The main disadvantages of this method are the need for extra costs for the outlet device itself, as well as possible problems at the junction, in the vicinity of the house's water supply system.

2. The second option is the simplest and therefore the most reliable. At the installation site of the pressure switch, a power cable is removed from the wall, with which the relay is connected to the network. In this way, maximum connection reliability is achieved, since The housing of the pressure switch, as well as the cable entry into it, are usually sealed and they reliably protect the contact point from possible adverse effects.

The main disadvantages of this method include increased requirements for the accuracy of choosing the output location and cable length, as well as some possible difficulty in subsequent maintenance. It is always easier to unplug the appliance than to disassemble and disconnect the wires.

In our installation example, the second option is chosen - the cable coming out of the wall. Maintenance problem solved by installing a separate circuit breaker for pressure switches in electrical panel boiler room.

Before connecting the power cable to the relay, make sure that there is no voltage at the installation site!

We proceed directly to connecting the pressure switch to the network, on the example of the Italtecnica TYPE PM/5G model.

Primarily remove the protective plastic cover, for this you need a straight screwdriver (slotted), unscrew the fasteners, as shown in the image below


Then in the pressure switch, a supply cable and a cable leading to the pump are laid through the cable glands.

This model uses standard sealed cable glands that are familiar to many. To fix the cable in them, you must first unscrew the plastic nut, then insert the cable first into it, and then through the input, inside the relay and finally tighten the nut until it stops.

Then, having previously prepared - having removed the protective insulation, connect the cable cores to the relay terminals pressure, according to the following diagram.


Do not pay attention that one of the connected cables in the diagram ends with an electrical plug, in our case, a power cable is connected instead, which goes continuously to the electrical panel.

After connecting the wires and control pulling all the terminals, you should get something like this:


This completes the connection, it remains only to carefully put the protective cover back on and secure.

Now, by turning on the electricity supply, you can check the operation of the water pressure switch and adjust its operation.


As you can see, there is nothing complicated in mounting the relay, especially if you clearly understand the principle of its operation.

If you still have any questions about connecting the pressure switch to the mains, for example, you have a more powerful pump or it is three-phase, or just a different model of the relay, or you don’t know how to connect and which cable and socket to use, be sure to leave them in comments to the article, I will try to answer everyone promptly.

The pressure switch PM/5-3W is made in Italy. It is used to create automatic water supply systems both in the private sector and small industrial enterprises. It has excellent performance characteristics and a number of innovations that allow this device to be successfully used to control the water pressure in the system.

Peculiarities
- Applicable for single-phase pumps.
- Long service life
- Durable plastic housing
- Built-in pressure gauge
- The presence of three 1 inch outlets allows you to connect a pump, a hydraulic accumulator and a water outlet.

Specifications

  • Mains voltage - 230 V, 50 Hz.
  • Maximum power - 1500 watts.
  • The maximum switched current is 12A.
  • The maximum working pressure is 5 bar.
  • Switching pressure regulation range – 1 - 2.5 bar.
  • Cut-off pressure regulation range –1.8 - 4.5 bar.
  • Hydraulic connection - 1" male x 1" female x 1" female.

Wiring diagram

This pressure switch is in great demand due to its high quality and good design - the ability to connect three fittings and the presence of a pressure gauge. The maximum effect of the device is achieved in the presence of a hydraulic accumulator. Which avoids sudden pressure drops.
Recommended to use to create automatic system water supply at home or cottage.

How to buy pressure switch PM/5-3W

You can buy a pressure switch by making a purchase directly on the website of the online store, or by calling by phone in the Contacts section. Our manager will contact you and arrange delivery or reserve the goods for pickup.

If you need a pressure switch in Moscow, we offer delivery within the city and the nearest suburbs. For buyers from other regions of Russia - delivery by any transport company or postal service as agreed.

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When picking up from the store, or upon receipt of the goods by the courier.

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When placing an order, select the payment method: "Bank Transfer".

After confirming the order, our specialist will contact you and after agreeing on all organizational issues, you will be sent an invoice by e-mail, which you can pay in any bank or through an internet client.

1. Pickup.

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PVZ m. Sokol: you can pick up the order the next day after the order from 10 to 18 on weekdays. The order is stored at the point of issue for 3 working days.

Pickup cost:free of charge when ordering from 1,000 rubles. (when ordering less than 1,000 rubles - pickup cost - 80 rubles)

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The following items are delivered free of charge:

Kerosene heaters trademark"Sengoku"

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If your order weighs more than 20 kg - the manager will calculate and inform you the cost of delivery additionally!

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Delivery is carried out on weekdays from 10:00 to 20:00.

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Exact delivery address (city, street, house number, apartment or office number, intercom code)

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Contact phone numbers

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Cost of delivery:

If the WEIGHT is not indicated in the product card, you can check it with the manager.

If your order weighs more than 20 kg - the manager will calculate and inform you the cost of delivery additionally!

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Delivery is carried out within 1-3 working days from 10:00 to 20:00 no reference to noon.

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The estimated cost of delivery of goods can be found on the websites of these companies or contact our specialist.

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If none of the above methods suits you, we will send the goods to your address in another way - as agreed with you.