Modernization of the TsTP

Modernization of the central heating point

The plan:

1. The essence of the task: who applied, with what problem

2. What needs to be done

3. What revealed the inspection of the object

4. How the work started

5. What problems have you encountered

6. What has been done

7. What did the customer get in the end

Our company was contacted by a service organization that needed to modernize the control system of the central heating point of the residential complex.

The central heating point is a fairly impressive basement designed to control various water supply circuits to the building: ventilation, hot water supply, cold water supply, a make–up system (maintaining pressure in the risers). The difference between individual heating points (ITP) and central heating points (CTP) is only in the size and composition of the equipment.

The object is an apartment 55–storey residential building with 4 floors of underground parking. Since the construction of the house in 2008, the TSTP system has been controlled using SAUTER equipment. At first, the system worked well, but then it began to malfunction, maintenance turned out to be excessively expensive. Since the control system was left without maintenance by the developer, it lost its functionality in automatic mode and was transferred to manual control. The temperature control circuits did not stabilize, but were adjusted manually, setting the percentage of the KZR opening on the valve itself. This greatly complicated the work of the service personnel, since often the parameters change dynamically, especially in the "Autumn-Winter" and "Spring-Summer" transients, when the street temperature can reach summer values during the day and drop to negative values at night. In general, the maintenance of such an object is a responsible task that requires timely and correct decisions.

Thus, it was necessary to replace the equipment in the cabinet with one that could be installed and maintained on a fairly budget, which could solve the tasks at hand. OWEN equipment was selected. The modernization of the heating point assumed that there would be little possibility of de-energizing the automation cabinet during the production of works.

The sequence of modernization:

The first thing that was done was an audit of existing connection schemes. We transferred the data for each module to the table, where each cable goes, which tag hangs on which wire. For each signal, the necessary information was entered in a new line (tag on the core, contact numbers on the module). After that, it remained to verify this information with the available project documentation, which was carried out.

The next task was to adapt the signal composition available at the facility to the signal composition that is embedded in the OWEN I/O modules. Full synchronization, of course, did not work out, but the work was carried out due to the fact that all the signals were unified and were present as part of the OWEN I/O modules.

Based on the results of this work, a specification of the equipment that was required to be purchased was compiled. Additionally, we ordered two new power supplies with Ethernet (BP120K), which harmoniously integrated into the new system. Just such a power was required, with some margin. The generated specification was transferred to the Customer for the purchase of the necessary equipment.

After the equipment was purchased, it was decided to assemble and program the stand: debug the algorithms on the software simulator, display all the values on the panel, and only after that install the equipment at the facility. As a stand, a temporary frame was assembled on which the equipment was mounted. Then the frame with the equipment was transferred to the facility and the signals from the old equipment were transferred sequentially, connecting wire by wire, while maintaining the standard marking. Crimping couplings were used to extend the mounting wire. This approach allowed us to carry out the work without interrupting the operation of the central heating point.

At the very beginning, the pump start–up commands were transferred, then the control signals of the KZR (control drives), then all temperature and pressure sensors, discrete sensors. Conducted a comprehensive debugging. It should be noted that such a scheme of dismantling and installation entailed a slight increase in cable products in the cabinet. We had to build up each communication line by a meter, we had to tie up the remaining cables tightly enough. At the same time, this solution made it possible to reduce time losses and maintain quality during transfer.

None of the channels was lost, the design solution remained intact. The aesthetics and layout of the cabinet as a result remained at a workable and acceptable level.

A little bit about the resulting system: a fairly large visualization panel SP315P OWEN with an Ethernet port is installed, which allows you to make a fairly fast communication exchange with PLK210 OWEN. The system is medium in size, with about 200 I/O channels. Ten pumping groups, twelve PID control circuits.

The system implements weather-dependent control, that is, the controllers receive the outdoor temperature values and can control the temperature of the system. Thus, stable operation of all systems at home is achieved.

When developing HMI, we tried to implement the approach – "no more than 3 taps to the target", as a result, a simple and understandable visualization turned out, including graphs for adjusting the PID coefficients and visual graphs of weather dependence on four points. When developing the visualization, we moved away from the now popular dark theme, introduced solidity in sand tones, the Customer really liked it. Automation of the TSTP was successful.

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I am often asked why customers choose OWEN? In this case, the customer is a large engineering company located in Moscow. The OWEN company is also located in Moscow. Logistics and procurement issues are simplified. In addition, the pricing policy of this brand is always open. Prices can be viewed in advance on the website and a decision can be made as appropriate. Unlike some other manufacturers who disclose the cost of their equipment only upon special request. Our company actively cooperates with the OWEN company. We are a OWEN system integrator with expertise in equipment of this brand. We give a one-year warranty for all works and software.