崴 思 克 克 PLC and touch screen in the screw machine chiller industry applications!

1 Overview

Guangzhou Yongerke Automation Technology Co., Ltd. is a high-tech enterprise specializing in the design, development and sales of PLC, human-machine interface, embedded controller, automation control system and automation machinery. Over the years, the company has integrated into today's advanced microelectronics technology, combined with the experience of automation industry, has made remarkable achievements in the field of automation control, and has become a company with strong influence in automation.
This control product is designed for needle screw single-press water-cooled cold water and water source heat pump models. This system adopts PSC232R+WT5070S touch screen to realize.

1.1. Performance Introduction

1. Using advanced high-speed embedded microprocessors, the performance is much higher than that used in the same industry.

2. The mainboard adopts SMT surface mount technology, which has a compact structure, low heat generation, and strong anti-interference ability.

3, the motherboard reserved a serial port, can quickly download the program from the PC computer to facilitate program upgrades and hardware expansion.

4, using 485 communication transmission technology, data transmission distance and signal attenuation, can reach 1200 meters.

5, hardware has self-diagnostic ability, can automatically eliminate hardware failures, and the software uses redundancy, trap technology and hardware WATCHDOG combined to improve the overall anti-jamming capability.

6, storage capacity, 256K of program storage capacity, 16K of power-off data storage capacity, storage parameters for the storage chip stability, reliability is not lost.

7, built-in a variety of parameters for manufacturers to choose before setting the factory, and provide password protection.

8, can check the actual temperature of each point at any time, and may query the switch input, relay output, and can modify the set temperature at any time.

9, there is a remote control to open and stop, open the locker every day.

10. You can query current faults and historical faults. Faulty statistical functions can be used to analyze the unstable part of the machine in order to complete it. Historical failures can be queried by the time of failure.

Specific specifications of WT5070S and PSC232RT are as follows

Table 1-1 Technical specifications of the WT5070S

Table 1-2 PSC232R technical parameters

1. Description of control logic

1.1. Switching Machine Operation Logic

Table 3-1 Switching Machine Description

Timing function

Remote function

Timer switch

Line control switch machine

Local/Remote Modbus Switching Machine

Enable

Prohibited

√

×

×

Enable

Enable

√

×

×

Prohibited

Enable

×

√

×

Prohibited

Prohibited

×

×

√

The startup sequence is as follows:

Press <Start> button ---->【Delay】---->Open the air-conditioning pump ---->【Delay】--->Open the cooling pump--->【Delay】---- > Open 25% valve--->【Delay】---->Open Compressor ---->【Delay】---->Open 50% Valve---->The unit formally realizes energy adjustment

Shutdown operation is as follows:

After the system is fully started, press <Stop> button ----> 25% operation ---->【Compressor off 25% load operation delay】--->Close press relay, off 25%, off liquid valve --->【Cooling pump delay close】--->Off cooling pump--->[Refrigeration pump delay off]--->Off the refrigeration pump