The entire set of paper machine auxiliary control points, hydraulic system, pneumatic control system, and unified interlocking control is integrated with the main transmission and DCS monitoring.
Power cabinet
The system's main incoming circuit breaker uses internationally renowned brands, offering multiple protection features, including delayed tripping.
Intelligent voltmeter and ammeter
The system adopts intelligent instruments with communication capabilities, making it easy to monitor parameters such as current and voltage.
Rectifier cabinet
12 pulse rectification system
The system power supply uses a 2-stage rectification with a shared DC side. All copper bars and reactances are symmetrically designed. A 12-pulse rectifier system offers energy savings, high efficiency, and excellent protection for both inverters and motors.
Incoming reactance
We use a well-known Shanghai brand reactor, made entirely of copper, with a voltage drop of 4.4 V, specifically designed for use with ABB inverters.
Principle of 12 pulse rectification system
Drive for Paper Mills
At present, large paper machine drive systems generally use a 690 V power supply. Whether the supply is 690 V or 400 V, using a frequency converter is highly beneficial, as it saves energy and provides protection for both the converter and the motor. It should be noted that the output side of a 690 V system inverter must be equipped with a du/dt filter as standard.
690V 12 pulse rectification
Inverter cabinet
Cabinet with heat dissipation duct design
Each drive frequency converter uses an internal air duct design. The cabinet is divided into cold and hot compartments, with the frequency converter always located in the cooled area. All generated heat is discharged outside the cabinet through the air duct, creating effective airflow for heat dissipation. This improves the converter's cooling efficiency, enhances system stability, and extends its service life.
Drive for paper mills Anti interference design
Partitions between the cabinets prevent electromagnetic interference between the inverters, improve communication stability, and enhance the cabinets' EMC performance.
Inverter main power circuit
Network diagram of paper machine drive system and MCS
This diagram represents a commonly used system network, which employs ProfiNet for communication. Communication between the frequency converter, touch screen, and PLC uses a ring network redundancy design. The transmission system generally uses an S7-1500 PLC. For DCS systems with more than 3,000 points, the PCS7 system can be used, while smaller DCS systems can use a TIA Portal S7-1500 PLC.
Operation Station
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