Automation system design of mechanical systems for a warehouse complex
Завершили монтаж и пнр проектирование автоматики АК инженерии складского комплекса.
Ниже подробности..
DESIGNING OF AUTOMATION OF ENGINEERING NETWORKS OF BUILDING OF ACCOM
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1. Baseline data of the project ACS and main provisions
The project of automation of engineering systems is carried out on the basis of the following documents:
- contract for the design of automation systems and scheduling engineering systems;
- technical specifications of adjacent sections;
- technological and construction drawings;
- current regulatory documents:
СНиП 31-04-2001
"Warehouse buildings"
SNiP 2.08.02-89 *
"Public buildings and facilities" (Ed. 2002)
SNiP 2.09.04-87 *
"Administrative and residential buildings"
SNiP 21-01-97
"Fire safety of buildings and structures"
SNiP 2.08.01-89 *
"Residential buildings"
SNiP II-01-95
"Instruction on the composition, procedure for the development of coordination and approval of design and estimate documentation for the construction of enterprises, buildings and structures"
BCH 60-89
“Communication, signaling and dispatching engineering equipment for residential and public buildings. Design Standards
PUE, ed.6, 2002
"Rules for electrical installations"
Considering the main purpose of the building, the project provides for the possibility of further expanding the network for dispatching and automation of engineering equipment. Additional control and monitoring panels with the necessary equipment may be located in the technical premises of the complex as the need arises to automate new systems.
This project includes:
- automation of general ventilation systems;
Structurally, the automation system is a network of control, freely programmable controllers installed in the boards (together with the power unit) at the place of installation of this or that equipment.
The connection between controllers and external devices (drives, sensors) is carried out with the help of shielded cables, such as MKESH 2x1.0, 3x1.0, 4x1.0, the shields of which are properly grounded in order to avoid induced currents. The cabling of the automation system is carried out in separate metal trays, at a distance of at least 200 mm. from power wiring, and from trays to units in a metal corrugated pipe with a diameter of 16 mm. In addition to remote and automatic control of units, provides for "local" control, directly from the control panel; In addition, the project provides for installation of safety switches at the place of installation of units that are remote from the panel (pumps, general ventilation fans).
2. Basic automation solutions using Honeywell equipment.
2.1 To solve the problems of automating the general ventilation system, the project uses a complex of Honeywell products.
The complex includes:
- primary converters with unified output signal 0 ... 10 V (air temperature sensor, water (liquid) temperature sensors);
- differential pressure sensors with discrete output signal;
- drives of water valves and air dampers;
- freely programmable, multifunctional microprocessor controllers EXCEL 500;
- the device of communication of the personal computer with controllers - BNA;
2.2 In the premises of the placement of ventilation systems, the installation of electrical panels with built-in controllers is provided.
2.3 Systems management provides 3 modes:
- Local control of electric motors of fans, pumps from control panels.
- Remote control (from the CDP premises)
- Automatic systems management.
2.4 Automatic control is carried out according to a predetermined program embedded in the controller.
2.5 In order to put the unit or the entire system into local control mode, the corresponding switch must be turned on or all switches on the control panel should be set to “On”
Local control mode should be used only when debugging systems and in case of emergency.
2.6 Automatic control panel with EXCEL500 controllers provides:
- start in work in a certain combination and sequence of all units of the system;
- implementation of the necessary laws of regulation and management, blocking dependencies;
- the inclusion of a backup pump motor when a worker fails;
- measurement of current parameters and transfer of their values to the CPD;
- control of the state of the equipment (enabled / disabled, accident);
- remote on / off systems from the CPD; current technological processes.
3.1. To solve the problems of automation of general ventilation, provides a set of tools using the combined switchboards of control and automation. The complex includes:
- electric control panels
- electrical control panels and automation with built-in controllers, located at the place of installation of the equipment they serve. The power characteristics of the general ventilation ventilation boards are as follows:
~ 380 V, 50 Hz, according to the 2nd category of power supply reliability,
- bus information exchange between controllers (C-BUS), physically representing a two-wire communication line.
3.2 Automation of general ventilation systems provides:
- Management of general ventilation systems (on / off) from the dispatcher's workplace or automatically according to a temporary program.
- Control of the supply (exhaust) fan in automatic mode with observance of all necessary interlocks and dependencies, such as - blocking due to the absence of differential air pressure on the fan, danger of freezing the heat exchanger (according to a signal from the thermostat of low air temperature behind the heat exchanger), low temperature of the return heat carrier.
- Control of the circulating pump in the automatic mode - changing the mode of operation of the system by the operator from the central computer depending on the season, or in the automatic mode according to the readings of the outdoor temperature sensor.
- Control of the valve actuator on the coolant in automatic mode, observing all the necessary interlocks, such as opening the valve 100% with the threat of freezing of the heater, closing the valve when changing the season from "winter" to "summer". In the operating mode, the controller controls the valve depending on the air temperature in the room served by the supply system. Through its opening or closing, the supply air temperature varies according to a schedule from +13 to + 29◦С, depending on whether it is necessary to heat the air in the room or cool it to the setpoint set by the operator. To accurately maintain the air temperature in the room, the PID control law is used in the valve control program.
- Control of the valve actuator on the coolant in automatic mode, observing all the necessary interlocks and dependencies, such as - closing the valve when changing the season from “summer” to “winter”. Control is carried out similarly to the valve on the coolant.
- Shutting down the general ventilation system when an alarm signal is received from the fire alarm system on the ventilation control panel. Each ventilation control panel provides for the connection of an external signal from the PPP. Shutting off consumers, in order to increase reliability, is carried out at the "relay level", i.e., even when consumers work in manual or remote mode, it should
there is a guaranteed shutdown.
DESIGN DOCUMENTATION BACS
3.3 The scheduling of general ventilation ventilation systems includes:
- obtaining information about the temperature of the supply air;
- obtaining information about the temperature of the supply and return coolant;
- obtaining information (in graphical form on the CDP monitor) about the presence of pressure drop on the fan (supply and exhaust);
- obtaining information (graphically) on the presence of pressure drop on the filter;
- obtaining information (in graphical form) on thermostat triggering
low air temperature behind the heat exchanger;
- obtaining information on the arrival of a fire signal to one or another ventilation control panel from a fire alarm station (PPS);
- obtaining information on the position of fire dampers (graphically).
- obtaining other statistical, preventive and emergency information.