Control station for two drainage pumps. Teplosfera LLC - Control station for drainage pumps SU-DN

Reliable water supply is an integral part of a residential building, public building, production premises. But the issue of water disposal is no less important. To maintain the proper level of comfort on site and improve durability building structures, it is necessary to carry out emergency pumping of water, as well as to ensure the operability of the drainage and sewerage system in any conditions, preventing flooding and overflows. It is for this that the “fighters of the invisible front” are working - fecal and drainage pumps, which independently work somewhere on personal plot or in the bowels utility rooms. Automation for the drainage pump makes the equipment truly practical and as efficient as possible.

The drainage pump is also called the "pump for dirty water”, as it can pump liquids containing a large amount of solid particles. In surface or submersible versions, this equipment is indispensable for pumping water from tanks that need to maintain a “level”: pits, pits, wells, storage tanks, collectors, large sewers, drain pits, etc.

Cascade of two pumps with float switches and control panel

Such devices will help protect vulnerable areas that are periodically flooded (basements, cellars, ground floors). Also, drainage pumps are used to maintain (clean, drain excess water) artificial reservoirs with a soil bottom, they allow you to easily pump water for irrigation of farmland from natural sources - rivers and lakes.

Important! The ability to pump and transport liquids with mechanical inclusions does not mean at all that the drainage pump will not pump clean water. Often it is used to fill storage tanks, for example, when implementing a two-stage autonomous system cottage water supply.

Basic functions of automation

The main task of automation for drainage pumps is to turn the pump on and off when the specified conditions are reached, which makes it possible not only to forcibly drain and fill containers, but to maintain the required safe level of liquid without the participation of the homeowner.

Pumps are expensive devices. They "do not like" to work without water, which, being a pumped working medium, also plays an important role in lubricating some moving parts and cooling equipment. Dry running for a drainage pump is just as harmful as for any other device. Practice shows that it is impossible to be one hundred percent sure that this will not happen, even if the level in the source / reservoir is actively replenished. To avoid such situations allows automation, which at the right time turns off the power.

Drainage pump control station configuration option

Automation for a drainage pump is not just a switch. It should be considered as a complex multi-component device, the so-called "control panel", which, among other things, protects power equipment from:

• short circuit;
• voltage drop (from high and too low);
• leakage current (including human from electric shock);
• phase wire breaks and phase imbalance (for 380 volt devices);
• increasing the current strength (when the impellers are jammed);
• burning / sticking of contacts and terminals.

Ready-made remotes are available for sale, to which you only need to connect the necessary sensors and program them. If you have experience, you can assemble a functional control unit on the DIN rail of a separate shield yourself.

Important! Devices that control the operation of drainage pumps allow you to turn on / off other electrically dependent devices, such as heating elements, as well as using an audible buzzer or lamp to signal the status of the equipment and emergency situations.

How to automate the operation of a drainage pump

Drainage pumping equipment is always controlled by a change in the liquid level. There are several options for devices, but they all function by applying or disconnecting power (the circuit breaks or closes). Consider the most common solutions for drainage devices.

Ways to use float switches

A universal device that allows you to control pumps when it is necessary to pump out liquid or fill tanks. The float switch is a small sealed plastic box with a permanently connected three- or four-wire cable up to 10 meters long. It is this type of automation that simple household pumps, but the "float" can be bought separately.

The float switch is installed by immersion in the pumped liquid, it is attached to the tank wall or fixed on power cable pump. To more accurately set the operating level range, a sliding weight is put on and fixed on the switch wire. By changing the length of the cable between the switch and the load, the optimal moments of the float operation are set.

In fact, the float switch is both a level sensor and a switching device. It works very simply. Inside the body with positive buoyancy, a metal ball moves freely through a special channel. When the float is raised/lowered at an angle of about 45 degrees, the ball goes to its extreme position and hits the on/off microswitch key, which, in turn, powers the circuit or breaks it.

Important! The automation for the drain pump with a microswitch in the float is an inexpensive solution, but it cannot provide high precision level control. In addition, the float switch does not allow the tanks to be completely drained. It also has problems with sticking contacts, which, however, is solved by using an auxiliary contactor.

Diagram of an automation device with three conductometric sensors

Conductometric level sensors

The principle of operation of such a control system is based on the electrical conductivity of the pumped liquids. Electrodes from of stainless steel are immersed in water. One of them, the control one, must always be in the water, while the others, the signal ones, are mounted at their levels. Between them, small currents are constantly transmitted through the working medium. If the water reaches the lower signal sensor, then a layer of air (which does not conduct electricity) appears between it and the control electrode, which immediately catches the control unit. And when the water rises to the upper sensor, the air, on the contrary, is displaced by the liquid, and the signal circuit is closed.

Important! The metal wall of the tank or a grounded pump housing can be used as a reference electrode.

If the floats can work both with a remote control and independently, then such automation is necessarily equipped with a remote control unit. It is to him that signals are received about the state of low-current circuits inside the tank, and then the controller gives a command to operate a switching device (for example, a magnetic starter) to turn the pump on / off. By the way, multi-electrode sensors can control several pumps that operate simultaneously or in turn, including those installed in different tanks.

The system can use conductometric sensors with multiple electrodes (to monitor a large number levels), but configurations where only one electrode functions are also possible. This variability allows you to assemble automation for a drainage pump with your own hands, which will be most effective for specific conditions. In any case, conductometric control devices are more reliable and much more accurate than control systems with float switches.

Video: pump automation

The SU-DN control station is designed for automatic and manual control of a group of drainage pumping units that pump wastewater from a drainage reservoir. The station controls the pumps by signals from float or conductometric level sensors.

The SU-DN-PP version of the station provides a smooth start of the pumps using soft starters installed on each pump.

Control station symbol structure

• SU-DN- Station automatic control drainage pumps with direct start-up of pumps from the network.
• SU-DN-PP- Station for automatic control of drainage pumps with soft starters (each pump has its own device).

X 1 - Number of supply lines for pumps: one line, two lines (one line for each of the two pumps) and more.

X 2 - Number of connected pumping units (2 or more).

BUT- Availability of automatic control mode - always available for SU-DN stations.

D- Availability of access to the dispatching system (in the form of potential-free contacts).

T- Availability of inputs for connecting thermistor (posistor) motor protection. Grundfos installs thermistors in pump motors from 3.0 kW.

AVR- The presence of a power ATS at the input of the station (for stations with two or more inputs).

X 3 - Power of the connected electric motor of the pump (kW).

X 4 - The length of the electrodes of conductometric sensors - all the same or, if different lengths, - through "/" (for version 2..4). Here you can also specify the number and type of sensors, for example 4xDS.P-2.0m - 4 Aries DS.P sensors with electrodes of 2 meters each are included.

Spanish X- execution of the station depending on the type of sensors used.

Executions in ascending order of price:

• Version 1- the station of this version is designed for connection of float level sensors. The number of floats corresponds to the number of simultaneously operating pumps - for example, for stations for two pumps, when float No. 1 rises, the main pump is turned on, and float No. 2 is an additional one. Both pumps are turned off when float No. 1 is lowered - i.e. after draining the tank. This is the simplest version of the station, the pumps are controlled by a relay circuit, without the use of automation devices. The main pump is selected manually by a switch on the station door. In a station of this design, pump serviceability is not monitored; in the event of an accident of the main pump, the liquid in the tank will rise to the level of switching on the additional one - thus, the pump is redundant. Float sensors are not included in the delivery set of the station. If necessary, floats Nivofloat NW-100 or Aries PDU-3 can be included in the order (floats must be able to operate at voltages up to 250V).
• Use 2- the station of this version is built on the basis of the ROS301 device, therefore, the sensors are conductometric electrodes. On ROS301 it is possible to manufacture a station for a maximum of 2 simultaneously operating pumps. The main pump is switched on when the middle level electrode is flooded, the additional pump is switched on when the upper level electrode is flooded. Both pumps are switched off when the low level electrode is drained. In this station, similarly to version 1, the operation of the main pump is not monitored, the backup one is switched on when the level of its activation is reached. The main pump is selected manually by a switch on the station door. Three conductometric sensors are included in the ROS301 instrument kit, and the common electrode is metal body reservoir. When ordering, you must specify the length of the electrodes - all three can be the same, or the length of each electrode is indicated through "/". If the length is not specified, sensors are supplied with a length of 0.6 m - more details about ordering sensors on the manufacturer's website ROS301.
• Use 3- the station is similar to version 2, but is performed on the basis of the Aries SAU-M6 device (or, if necessary, on the Aries SAU-U). Stations of this design can be equipped with three or four electrodes, devices "Oven" allow you to use both a separate electrode and the metal body of the tank as a common one. The stations are equipped with Aries DS.P type electrodes with a rod of the required length. It is also possible to complete with other conductometric sensors according to the catalog of the Oven company. When ordering, you can specify the quantity and type as follows: SU-DN-22-A-1.5kW-4xDS.P-2.0m - 4 DS.P sensors with electrodes of 2 meters each are included.
• Use 4- stations of this design are manufactured on the basis of the programmable controller Oven PR110 and the block for processing conductometric sensors Oven BKK1. These stations can serve up to three simultaneously operating pumps with each pump controlled by a flow switch or pressure switch, with automatic alternation of the main and additional pumps to ensure uniform resource development. In this station, the backup pump is switched on immediately in the event of an accident of the main one, without waiting for the reservoir to be filled to the upper level; at the same time, it is possible to send a pump alarm signal to the dispatching system. The stations are equipped with three (for two pumps) or four (for three pumps) sensors of the Oven DS.P type with a rod of the required length, or other conductometric sensors according to the catalog of the Oven company. If the tank is non-metallic, one more sensor needs to be added (see above, in version 3).

Operating conditions:

The control station can operate under the following conditions:

• ambient temperature:
  • version 1 and 2 - from -25° С to +50° С;
  • version 3 (SAU-U.Shch11) and 4 - from -10° С to +50° С;
  • version 3 (SAU-M6) - from +1° С to +50° С;
• relative air humidity no more than 98% at 25°C without moisture condensation;
• altitude up to 1000 m;
• long-term deviation of the supply voltage from +10% to -15%.

Technical details:

Type of supply current

Variable

Rated network frequency

Rated supply voltage

Number of connected pump units

Execution

* - stations with more than 3 pumps are manufactured on special order.

Depending on the level, according to certain "settings", a signal is issued to turn on / off one, two or three pumps. In addition, alarms are provided about the threat of overfilling the well and protection of pumps from "dry running".

These signals are fed to the pump control cabinet.

2. Sensors and secondary devices

2.1. Sensors

2.2. Measurement of the operating level and the formation of control signals according to the given "settings"

An ultrasonic level transmitter is available for operating level measurement. EasyTrek SPA -380-4 . This level transmitter is a two-wire transmitter with 4…20mA + HART output. Measuring range 0.25…6m. Factory setting: 0.25m - 4mA; 6m - 20mA. Using a personal computer, via a HART modem, user configuration of the level gauge is allowed. So, for example, the values ​​4 and 20mA can be assigned to the limits of the actually measured range (scaling).

To convert the current signal 4...20mA from the output of the level gauge into a discrete signal (relay), it is proposed to use a current control relay UNICONT PKK -312 .

The device is an intelligent relay for level control and pump control tasks. Using the "Teach-In" function, it is possible to "remember" two level values ​​in the current range 4 ... 20mA, as well as assign one of the programmed modes to control the output relay contact. To turn the pump on and off according to two-level logic, the Switching Difference mode is provided.

To generate discrete signals to control 3 pumps, 3 current control relays are required UNICONT PKK -312 . The connection diagram of the level gauge (sensor) and the current relay is shown in Fig. one.

Figure 1. Wiring diagram for a 4...20mA sensor and three current relays

Figure 2. Diagram of the operation of the circuit (Fig. 1) at the given settings

2.3. Well overflow alarm

To signal the overflow of the well, it is proposed to use a float level switch NIVOFLOAT NWP-110. The signaling device is equipped with a switching "dry contact". Switching occurs when the float rises to the maximum upper level mark Wastewater. Because overflow corresponds to an "alarm" situation, it is recommended to use a NC contact.

2.4. Protection of pumps against "dry running"

The dry run protection circuit is built using the following devices:

• Two submersible conductive probes NIVOCONT KSK-201;
• Level control relay NICOCONT KRK-512(U pit = 24…240V AC/DC).

A waterproof single-wire cable is attached to each probe, on which the probes are immersed in drainage well to a controlled level (slightly above the suction point).

Figure 3. Wiring diagram

One of the probes is connected to input C. The level switch controls the presence of continuity between the probe connected to inputs E1 and E2 and input C. After immersing the probes and supplying voltage to the relay, it is necessary to adjust the sensitivity using the potentiometer on the case, thereby allowing the relay to react on the conductivity of the medium. The conductivity measurement is made using a periodic low-voltage electrical signal. In the absence of conductivity, which means the level drops below the minimum mark, the device switches the contacts of the output relay (terminals 15, 16, 18).

Maintenance of an autonomous water supply system includes control over pumping equipment and serviceability of communications, conservation of the network during a long absence, rational automatic control.

Automation is easy to implement by installing a pump control cabinet in a specially designated place - a compact distribution station operating in several modes. We will tell you in detail how to competently assemble and install it. Following our advice, you will be able to correctly connect the equipment.

We have given a typical configuration of the control cabinet. Describe what additional functions can be installed and used. The information proposed for consideration was supplemented with useful illustrations and videos.

The technical filling of different models is different, since the control points have an individual functional focus.

Manufacturers offer ready-made standard circuits, but they do not always meet specific requirements, so there is such a service as custom-made control unit manufacturing. To begin with, we will try to consider the common positions that unite all models.

Functional responsibilities of the control cabinet

The main function of any distribution station is to organize the operation of the equipment connected to it, in this case- pumping. From one control panel (and this is convenient if the distance between objects is large), control over the engines of drainage, surface, borehole pumps is effectively performed.

The number of connected units may vary. The minimum connection is one borehole or one that supplies water and provides it with the entire water supply system (heating, fire extinguishing). In addition to it, a drainage pump is connected, which is necessary for pumping water in domestic and emergency situations.

Image gallery

Automatic on / off pumping motors makes life easier for owners of a private house, allowing free time spend in the family circle, and not for manual switching of toggle switches.

A few more convenient functions that can be “entrusted” to automation:

• voltage control in the network, necessary for the smooth operation of the equipment;
• protection of mechanisms from power outages and short circuits;
• control of the water level in a well (or other reservoir) and response to its lack;
• fixing pressure surges and adjustment optimal parameters(stopping the engine when reaching a critical point, starting when equalizing indicators);
• remote control borehole pumps, direct access to which is impossible;
• load sharing between several units or emergency connection of a fallback.

As a result of centralized automatic control, it becomes more productive, and the service life of electrical equipment is noticeably increased. Modern electronic systems allow you to program mechanisms and turn them on in a convenient mode (for example, only in the daytime).

Protection devices against power surges, phase failure, incorrect connection protect the mechanisms and do not allow them to work in emergency mode. They adjust the network parameters, and only after equalizing the indicators automatically connect the equipment.

Overload protection works in much the same way. For example, there is a prohibition on the simultaneous activation of two pumps, which leads to extra expenses and misuse of equipment.

Almost all debugged systems have the ability to switch from fully automated to manual control. This is necessary for Maintenance, repair work, replacement of worn or burnt parts

Suppose, if one pump fails, it can be easily removed and sent for repair by turning off the automation and using manual control.

Additional options and features

Various manufacturers include additional functions in the basic package that expand the control capabilities. For example, the Alta Group company offers an ABP system - turning on the backup power in automatic mode. The need for this function is due to the fact that the work pumping station is part of the life support system at home, therefore, the network must operate continuously.

The principle of operation of the ATS is as follows: as soon as the main power supply stops, the backup network is automatically introduced. It is valid until the main source is restored.

When it is turned on intelligent system checks the optimality of the parameters, and only with a positive response reconnects the main network. If the test analysis is unsatisfactory, the system will continue to work from a backup source.

Low temperatures and high humidity are the enemies of the electronic filling of the cabinet, so manufacturers offer a service additional insulation. It is relevant for northern regions and for any areas if the equipment is outdoors.

The so-called "warm package" is a layer of insulation laid with inside. Thermally insulated SHUNs are operated at a fairly wide temperature range - from -40ºС to +55 ºС

A fairly common addition that allows you to protect pump motors from overload is a soft start system. It consists in an accurate, gradually increasing voltage supply mode, thanks to which the engine is protected from a sharp start, put into operation slowly and carefully.

The modern dispatching function allows remote control. Remote warning systems are permanently connected to GPRS, a radio modem or the Internet, due to which, in an emergency, the blocking system is immediately activated, and the signal is transmitted to the receiving device (phone or laptop).

A convenient option that allows you to set a specific program is possible through the use of a controller. In automatic mode, it is able to independently influence the operation of pumps, connect additional devices, and optimize the functioning of the system as a whole.

Indication implies the location on the cover of the cabinet of an electronic display with voltage and current readings, as well as statistical data: the number of starts, engine operating hours, water volume

Another good option that allows you to get information about the shutdown of the system or the occurrence of an emergency is the installation of a light alarm and a siren. When force majeure occurs, the flashing beacon lights up with a bright light, and a special sound device gives a loud repetitive signal.

Samples of electronic technical connection diagrams

The assembly of equipment takes place in a production environment, there are compiled circuit diagrams pump control cabinet. The simplest are the connection diagrams for a single pump, although a set of additional devices can complicate the installation.

As an example, let's take ShUN-0.18-15 (Rubezh company), designed for manual and automatic control of electric drives of a pumping station. The control scheme looks like this:

Possible modes of operation: circulation and drainage by an analog sensor or by a pressure switch. Two options for the operation algorithm involve joint or sequential switching on of pumps

Specifications:

• Voltage - 1x220 V or 3x380 V, 50 Hz
• Motor power of the connected equipment - up to 7.5 kW for each motor
• Temperature range - from 0°С to +40 °С
• Degree of protection: IP65

In the event of an emergency and a breakdown of the pump motor (due to a short circuit, overload, overheating), automatic shutdown equipment and connection of a backup option.

Wardrobes Wilo SK

The SK-712, SK-FC, SK-FFS ranges from the Wilo brand are designed to control several pumps - from 1 to 6 pieces.

Several automatic circuits at the Wilo SK-712 cabinet greatly simplify the operation of pumping stations

Specifications:

• Voltage -380 V, 50 Hz
• Motor power of connected equipment - from 0.37 to 450 kW
• Temperature range – from +1°C to +40°C
• Degree of protection: IP54

During operation, all technological parameters are displayed on the display. In the event of an emergency, an error code is displayed.

Conclusions and useful video on the topic

You can learn more about how pump control cabinets work in the following videos.

How to make the simplest SHUN with your own hands:

An example of the operation of a typical SHUN on a test bench:

The use of pump control cabinets makes it possible to efficiently use the resources of downhole or drainage equipment and save energy. Knowing specifications of your pumping station, you can purchase the basic SHUN model or place an order according to an individual scheme.

To control electric drives various devices sewage pumping station (SPS) are widely used pump control cabinets, SHUN for short. They can be used in combination with the KNS control unit or standalone.

Features of pump control cabinets

ShUN produced by Elektra-M LLC controls pumping equipment according to the developed in accordance with specifications program. Discrete and analog sensors are used as external control signals in automatic mode various types. In the manual and adjustment modes of the cabinets, as a rule, control is carried out by the operator through the front panel, while some of the alarms can be disabled. In this case, all responsibility for decisions made lies with the operator.

Majority standard products designed for continuous operation at temperatures environment from 0 to +55 С.

Options for additional equipment

Pump control cabinets can be additionally equipped with instrumentation, which makes it easier to control the operation of pumps. Sensors display readings on the panel, where the slightest deviations are visible. Signaling devices indicating the presence of deviations can also be used. The use of instrumentation allows you to extend life cycle equipment and reduce operating costs.

KNS control cabinet - advantages and possibilities

Depending on the purpose and purpose of using the pumping units, the functions of the pump control cabinet may include soft starters, frequency converters and direct-on-line protective devices, which can also be found in wiring diagram KNS.

The controllers expand the functionality of the SHUN by processing the incoming information and transferring it to the operator on the console. SPS control cabinets from Elektra-M LLC, equipped with soft start have the following advantages:

• prevent reboots of the mains, which can occur repeatedly at startup,
• exclude hydraulic shocks,
• exclude mechanical resets.

Visual display of the operation of the control panel of a group of submersible pumps of a sewage station (SPS).

To maintain the required outlet pressure, we recommend the use of frequency converters.

When placing an order for SHUN at Elektra-M LLC, you can count on:

Automation is selected taking into account the performance of the pumping station, the volume of polluted water, the power of pressure, the number of serviced objects, etc. Depending on the type of wastewater pumped, the system provides sensors for oil, grease, water, sand, fire hazardous and aggressive media. The control cabinet itself is installed inside the SPS or outside, but not more than 150 m from it. It is fixed on a dry vertical surface, resistant to vibration and other adverse effects.

Since 2006, Elektra-M has successfully delivered equipment to more than 2,000 facilities. Delivery is organized throughout the territory of the Russian Federation. Confirmation of the quality of devices and materials are certificates of conformity and other related documents.

To get detailed advice on control cabinets, order a free visit of our engineer to study the object.

• selection of the optimal equipment for operation in your conditions;
• guarantees and service, free technical consultations;
• providing a list of necessary documentation;
• installation and commissioning of equipment by our specialists;
• prices are not higher than competitors with guaranteed high quality and delivery of the object without disrupting the agreed deadlines.

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