MTL5053 isolator/IS power supply

Description

MTL5053 isolator/IS power supply

MTL5053 isolator/IS power supply

The MTL5053 has been specifically developed to extend 31.25kbit/s (H1) fieldbus networks into hazardous areas. It provides power, communication and IS isolation to devices powered through the signal conductors. The MTL5053 complies with the requirements of Fieldbus Foundation™ specified power supply Type 133 (IS power supply). To comply with fieldbus standards, each bus must be terminated at both ends. MTL’s FBT1 fieldbus terminators (see section 6.33) can be supplied for this purpose or, for installations in which the safe-area bus length is small, the MTL5053 includes an internal safe-area terminator which is enabled by a switch located on the top of the unit.

Across hazardous areas: For communication across hazardous areas MTL5051 devices are used in pairs to transfer bi-directional fullduplex data across hazardous areas, as shown in figure 6.49. Current switching is used to minimise the bandwidth-limiting effects of long cables. The maximum baud rate in this mode is the lesser of 19.2k baud or the cable-related rate produced by the following formula. Remote signalling baud rate formula, for back-to-back mode across a hazardous area: max baud rate = K/(RxCxL2) where K = 0.25 (constant) R = cable resistance (Ω/m) C = cable capacitance (F/m) L = length (m) For example, with a 2km cable of 100pF/m capacitance and 40mΩ/m resistance, the maximum baud rate = 0.25/(40m x 100p x 2k2) = 15k baud. This assumes that the cable is 2 cores plus screen, with the screen used for the ‘common’ connection.

RS232-level devices: Communication with RS232-level interfaces, such as a suitably certified IS keyboard, mouse, etc, is achieved by using one or more MTL5051 units as required by the IS device. (TTL level interfaces are accommodated by the TTL compatibility of RS232 receivers.) The supply to IS equipment at terminal 2 can be set to either 5V or 12V, by a switch located on top of the unit, as follows: +12V mode 12.0V ±5% (load <23mA) +12V mode 8.0V min (load >23mA to <50mA) +5V mode 5.6V ±5% (load >23mA to <50mA) Note: the normal RS232 limitations of bandwidth versus cable length are applicable. As a rule of thumb, speed (baud) x length (metres) <150,000.

With the rapid development of Communication, Computer, Control, and CRT 4C technologies, DCS (Distributed Control System) technology has made significant progress. It has emerged from the noble mysterious tower and is widely used in new construction, expansion, and technical renovation projects. For coal-fired power plants and many factories that require flue gas treatment, electrostatic precipitator (ESP) is an important auxiliary equipment. Its self-contained control system faces the requirement of entering the factory DCS to control the dust removal equipment through the unified interface of DCS. We have developed and designed various interconnection methods between the electrostatic precipitator control system and DCS based on the specific requirements of users and in combination with today’s advanced technological achievements, and have successfully applied them to specific engineering projects, achieving centralized management and decentralized control, meeting the needs of user control as a whole. This article explores the interconnection capability between the electrostatic precipitator control system and the factory DCS system by analyzing various interconnection methods.

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