8521-TC-SA Temperature controller module

Heating fan control

The exhaust fan is one for use and one for backup, and the two are logically interlocked. However, the electrical control adopts two independent sets of star delta control, each set occupying three switch output points (main, star, triangle) and three switch input points (start, stop, fault). Therefore, the control of the exhaust fan occupies:

6-point switch input: (start, stop, fault) * 2.

6-point switch output: (main, star, triangle) * 2.

e、 Fast cooling fan control

The fast cooling fan has one on and one backup, which directly outputs control, thus occupying:

6-point switch input: (start, stop, fault) * 2.

2-point switch output: (operation control) * 2.

f、 Axial flow fan control

Axial flow fans: 8 units with a capacity of 0.18kw and direct output control, therefore occupying:

3-point switch input: start, stop, fault.

1-point switch output: operation control.

g、 Safety chain

Switching interlocking: necessary hardware interlocking and software interlocking. Further implement process interlocking requirements during design.

2. Selection of controller components

According to the above statistics, there are 8 temperature points collected; Switching input: 49 points; Analog input: 8 points; Switching output: 34 points; Analog output: 8 points

Therefore, it is necessary to select one temperature acquisition module: CAN-AD1216

Temperature control: EASY-M0808R-A0404NB 2 units

The fan control part adopts two Easy-M1608R units

In addition, one PLC (Easy-M1608R) for the main station is required, four PLCs (Easy-M1608R) for controlling the trailer section, one human-machine interface (10.4-inch, true color) for display control, and one ordinary computer for monitoring. Other electrical components: frequency converter, switch power supply, air switch, contactor, relay, button, indicator light, alarm, cabinet, etc.

8521-TC-SA Temperature controller module

systems analysis
1) Temperature collection section
10 thermocouples with K and S graduation numbers.
2) Temperature control section
Among the 18 o’clock temperatures, 8 o’clock (to be specified during design) is used for temperature control.
Among these 8 temperature control points, 7 are used to control the valve position value of the actuator, change the fuel injection amount, and stabilize the temperature. Another point is to control the output frequency of the quenching frequency converter, change the operating speed of the quenching fan, and adjust the temperature of the quenching zone. Other factors are manually adjusted (such as combustion air, gas pressure, etc.).
Each temperature control point occupies one analog output, while the quenching frequency converter occupies one analog output
Output, actuator adopts open positioning method.
Therefore, temperature control occupies:
8 analog signals (input, output).
3) Related fan section
a、 Smoke exhaust fan control
The smoke exhaust fan has one in use and one backup, and the two are logically interlocked. The electrical control adopts two independent sets of star delta control, each set occupying three switch output points (main, star, triangle) and three switch input points (start, stop, fault). Therefore, the smoke exhaust fan control occupies:
6-point switch input: (start, stop, fault) * 2.
6-point switch output: (main, star, triangle) * 2.
b、 Combustion fan control
The combustion fan has one in use and one backup, and the two are logically interlocked. The electrical control adopts two independent sets of star delta control, each set occupying three switch output points (main, star, triangle) and three switch input points (start, stop, fault). Therefore, the control of the smoke exhaust fan occupies:
6-point switch input: (start, stop, fault) * 2.
6-point switch output: (main, star, triangle) * 2.
c、 Emergency cooling fan control
The speed of the emergency cooling fan is adjusted by the frequency converter, and the output frequency of the frequency converter is controlled by the internal PID operation of the PLC to output a 4-20mA standard signal. At the same time, manual automatic switching can also be implemented for control on the human-machine interface. Therefore, the emergency cooling fan occupies:
5-point switch input: Quenching A start, Quenching B start, Quenching stop, Quenching A fault, Quenching B fault
2-point switch output: (operation control) * 2.
1-point analog output: frequency adjustment (manual automatic adjustment).

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