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The Application of NA200 in Chiller Cooling Equipment
Release date:
2020-04-07
A chiller is a refrigeration unit that provides chilled water, making it ideal for central air-conditioning systems and industrial processes requiring chilled water. It is widely used in large and medium-sized buildings such as hotels, office buildings, hospitals, and shopping malls for their central air-conditioning systems, as well as in industrial sectors like metallurgy, petrochemicals, machinery, pharmaceuticals, and electronics—where chilled water is essential for various manufacturing processes. This equipment employs the NA200 PLC as its control core. The PLC sends control signals to the respective actuators, managing the operation of the chiller units. At the same time, the PLC continuously monitors input signals from the units, enabling it to respond promptly to any operational changes or abnormalities during operation. Users can conveniently interact with the system via the touch screen.
A chiller unit is a refrigeration device that provides chilled water, making it widely used in central air-conditioning systems and industrial processes requiring chilled water—such as hotels, office buildings, hospitals, and shopping malls—as well as in industrial settings like metallurgy, petrochemicals, machinery, pharmaceuticals, and electronics. This equipment employs the NA200 PLC as its control core; the PLC sends control signals to various actuators, managing the operation of the unit. At the same time, the PLC continuously monitors input signals from the unit itself, enabling it to respond promptly to any operational changes or abnormalities during operation. Users can conveniently control the unit’s operation and check its current status through intuitive touch-screen interactions.
System Configuration
1. Feature Introduction
(1) Automatic Operation Function: When the unit is set to automatic dehumidification mode, the control system determines the appropriate energy level for operation by comparing the current room temperature and humidity with the preset values, thereby achieving automatic control of the supply air humidity.
(2) Debugging and Operation Function: The debugging and operation function is used for manually controlling the unit’s operation during unit commissioning. Users can directly control the actions of each unit via the panel. However, this function is not recommended for regular use by operators.
(3) Power-loss retention function: When power is restored after an outage, the control system can automatically resume its operating state as it was prior to the interruption.
(4) Password Protection Feature: The control system is equipped with password protection for critical operating parameters and commissioning functions, preventing unauthorized personnel from altering settings that could disrupt the system.
(5) Self-diagnosis and Fault Handling Function: The control system continuously monitors for any faults occurring during unit operation, promptly addressing them and displaying a record of the fault type and its location. Additionally, the control system provides a pair of fault alarm output contacts for user convenience.
(6) Query Function: With the query function, users can keep track of the unit's operational status at any time. The control system displays the supply air temperature and humidity, as well as the unit's working status, on the panel. Users can also access information such as the unit's cumulative operating hours, control parameters, and any recorded fault conditions.
(7) Remote Control Function: The control system's operation panel can be installed away from the unit, at a location convenient for the user, enabling comprehensive remote operation. (To utilize this feature, users must specify it when placing an order, and the distance should not exceed one kilometer.)
(8) Remote Monitoring Function: By connecting the host computer and modem via a public telephone line, remote monitoring of unit operation can be achieved. (To use this function, users must request it at the time of ordering; there is no limit to the distance.)
(9) External Interfaces: The PLC features RS232 and RS485 interfaces, enabling integration with the intelligent building’s centralized monitoring system.
2. PLC Configuration
This chiller unit employs the Nanda Aoto NA200 series PLC and its expansion modules as the control core, with the PLC configuration shown in the diagram below.
Figure 1: PLC Module Configuration
Figure 2 PLC Program
Figure 3: Touchscreen Display
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