SC756A-001-02 Power/Driver PACIFIC SCIENTIFIC

Description

SC756A-001-02 Power/Driver PACIFIC SCIENTIFIC

SC756A-001-02 Power/Driver PACIFIC SCIENTIFIC

The SC750 features an analog input channel and an analog output channel. The analog input channel is digitized and is available to the user under software control. The analog output is controlled by a digital-to-analog converter, also set by the user’s program. The analog input channel signal accepts signals with a +12 volt range with a differential input amplifier having 100 kilohms input impedance. The analog output channel provides a signal range of +5 volts, with 50 ohms source impedance.

The electrical connections of the PacLAN interface between SC750 servocontrollers is illustrated in the diagram below. Cabling for the PacLAN interface must conform to the cabling specifications met by twinaxial transmission cable manufactured by Belden. The Belden part number is 9271. This cable is also available from Pacific Scientific.

The Pacific Scientific part number is CL-CO-xxx, where xxx is the desired cable length. The most distant trunks of the cable should each be terminated in 120 ohm, 1/2 watt termination resistors. These resistors can be inserted into the screw terminal connectors after the cable has been soldered on. Note: PacLAN operation will be supported only if the proper communications cabling is used. PacLAN permits direct connection of up to 32 SC750 servocontrollers. The total cable length must be limited as indicated in the table. To acheive longer cable lengths, or to connect more than 32 controllers, ARCNET compatible active hubs must be used.

These devices are capable of transmission lengths of up to 2000 feet. Active hubs are available from SMC, Contempory Control Systems, Inc., and Black Box Corporation.

This article focuses on the application of DCS design, installation, operation, management, maintenance, and other aspects in thermal power generation. Representative problems that arise in the application are cited and solutions are proposed, attempting to provide useful reference and improve the level of DCS application, thereby improving the safety and economy of power generation units. Key words: DCS thermal power generation safety and economy 0 Preface Distributed control system (DCS) was introduced in the 1970s, and after 30 years of application, development, and improvement, it has occupied a pivotal position in the field of industrial process control. Since the mid to late 1980s in China, the vast majority of power generation enterprises, especially large units, have adopted various types of imported or domestically produced DCS for production process control, making significant contributions to the safe and economic operation of power production.

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