I. Five Types of Controllers
The first type: Microcontroller. The basic structure of a microcontroller (MCU) includes program memory, accumulators, buffers, stack and stack pointer, input/output (I/O ports), timers, counters, serial output (serial I/O), LCD driver, VFT driver, analog-to-digital converter (ADC), and digital-to-analog converter (DAC).
The second type: Electric vehicle controller. The main functions of the electric vehicle controller include ultra-quiet design technology, constant current control technology, automatic motor mode identification system, follow-up ABS system, motor lock system, self-test function, reverse charging function, stall protection function, dynamic and static phase loss protection function, power tube dynamic protection function, anti-runaway function, 1+1 power assist function, cruise control function, mode switching function, anti-theft alarm function, reversing function, remote control function, high-speed control, and motor phase.
The third type: combinational logic controller. The basic structure of a combinational logic controller consists of four components: an instruction register, an opcode decoder, a timing circuit, and an instruction counter.
The fourth type: CPU controller. The basic structure of the CPU controller consists of three components: instruction register (IR), program counter (PC), and operation controller (OC).
The fifth type: Access control controllers. The main classifications of access control controllers include RS485 networked access control controllers, TCP/IP networked access control controllers, non-networked access control controllers, single-door controllers, double-door controllers, four-door controllers and multi-door controllers, unidirectional controllers, and bidirectional controllers.
II. Classification and Composition of Chiller Controllers
A chiller controller is a master control device that controls the starting, speed regulation, braking, and reversing of the motor by changing the wiring of the chiller's main circuit or control circuit and altering the resistance values in the circuit according to a predetermined sequence. What are the different types of chiller controllers? What controllers constitute each type?
Chiller controllers are mainly classified into
Chiller controllers are divided into combinational logic controllers and microprogrammed controllers, each with its own advantages and disadvantages. Combinational logic controllers are difficult to design and have a complex structure; once designed, they cannot be modified or expanded, but they are fast. Microprogrammed controllers are easy to design and have a simple structure; they are easy to modify or expand. To modify the function of a machine instruction, only the corresponding microprogram needs to be rewritten; to add a machine instruction, only a microprogram needs to be added to the control memory, but it is done by executing a microprogram. A detailed comparison is as follows: Combinational logic controllers, also known as hardwired controllers, are composed of logic circuits and rely entirely on hardware to implement the functions of instructions.
Chiller controller components
1. The flow switch of the chiller is used to control the flow rate of fluid in the pipeline or to protect against flow interruption. When the fluid flow rate reaches the set value, the switch automatically cuts off (or connects) the circuit.
2. Chiller pressure controller
The pressure controller of the chiller is used for pressure control and pressure protection. The unit has low-pressure and high-pressure controllers to control the operating range of the system pressure. When the system pressure reaches the set value, the switch automatically cuts off (or connects) the circuit.
3. Chiller pressure gauge differential pressure controller
The differential pressure controller is used to control the pressure difference. When the pressure difference reaches the set value, the switch automatically cuts off (or connects) the circuit.
4. Temperature controller
Industrial chiller temperature controllers are used for unit control or protection. When the temperature reaches the set value, the switch automatically cuts off (or connects) the circuit. In our products, temperature control is commonly used, with the water tank temperature controlling the unit's start-up and shutdown. Temperature controllers are also needed for applications such as freeze protection.
5. Hydraulic controller:
The chiller features a unique built-in hydraulic system that ensures optimal lubrication of the compressor without the need for an oil pump. The oil separator employs a double-layer filtration system for excellent oil filtration, allowing the heat exchanger to operate at its maximum capacity.
