Take a paper machine (export project) compressed air control system project as an example
This paper machine auxiliary control system is aimed at the demand-side 3700mm/450mpm (37Y) coated white paper machine (export project) compressed air control system project, and serves as the basis for system design, production, debugging and acceptance. Pneumatic paper machine control system, which is scattered in various parts of the paper machine, controls the operation of the paper machine, closely cooperates with the main drive frequency conversion control system, and is interlocked to form an indivisible whole.
Simplify the complicated wiring method on site and facilitate future maintenance. Each auxiliary drive motor in the system has operation functions such as start, stop (or tighten or loosen) and operation instructions, and each point has perfect short circuit, overload and stroke P. Protection (if necessary). Some circuits also have interlocking/unlocking, operation/maintenance conversion or input/removal functions. The supply of MCS includes all interlocking control points (proximity switches, photoelectric switches, etc.) on the paper machine from the wire section to the coiler, and hydraulic control Point and alarm device, paper break detection, limit, etc.
All equipment calibration is based on the following conditions.
◆ Environmental conditions: no corrosive gas and liquid
◆ AC power supply: 230V
Voltage error: +/-15%, maximum
Frequency error: +/-5%, maximum
Phase imbalance: +/-2%, maximum
Control voltage: DC 24V
◆ Grid frequency: 50HZ