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Yokogawa Corporation of America

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YS170 Single-loop Programmable Controller (DISCONTINUED)

Notice: This product was discontinued on 1/01/2008.
YS1700 Programmable Indicating Controller is a replacement product.

Model: YS170 Single-loop Programmable Controller

Boiler Drum Level Control

  • In the YS170 and SLPC, single-element control needs to be configured within the user program.
  • The YS1700, however, offers the primary direct mode so that the user program can switch on and off single-element control by changing a parameter.

SLPC & YS170 Program Conversion

Most SLPC and YS170 controllers in the field contain a custom program stored on an EPROM in the case of the SLPC and in NVRAM in the case of the YS170. When upgrading from an SLPC or YS170 to a YS1700, it is necessary to either rewrite the program in YS1700 language or convert the program from SLPC or YS170.

YS170 Compressor Surge Control

Both centrifigal and axial compressors cannot be allowed to operate below the surge limit of the operating conditions. The machinery may be exposed to excessive stress and vibration. If the discharge flow demand is less than the compressor surge limit, some of that flow must be vented or recycled to the inlet to stay above surge.

YS170 Peer-to-Peer Communications

Both centrifigal and axial compressors cannot be allowed to operate below the surge limit of the operating conditions. The machinery may be exposed to excessive stress and vibration. If the discharge flow demand is less than the compressor surge limit, some of that flow must be vented or recycled to the inlet to stay above surge.

YS170 Ratio Control

In process operations, there are instances where ratio control is required to maintain a consistent blend of two or more components. This control action is used in chemical, food & beverage, and pharmaceutical batching operations.

YS170 RS485 Communications

YS100 series instruments are stand alone devices that control or indicate process variables throughout a manufacturing plant. RS485 communications cards can be optionally provided to transfer data from each instrument digitally to a PC-based operators station. Below is a typical system configuration to transfer data bi-directionally through this communications bus.

YS1700 Boiler Combustion Control

The boiler combustion control system is designed to maintain a proper air/fuel mixture under varying load conditions and within safe limits. The system should provide nearly complete fuel combustion as efficiently as possible. Discussions here are limited to oil and/or natural gas fired industrial boilers. 

YS1700 Boiler Control Overview

Automated control of industrial boilers is an excellent application for YS1700 microprocessor-based loop controllers. These instruments can be programmed to perform the operations of plant master, boiler master, fuel and air control with oxygen trim and drum level/feedwater control.

YS1700 Steam Drum Level Control

Steam drum level control is necessary to add makeup water as steam is delivered into the header and to the associated process equipment. The system should control the drum level at a specific set point while compensating for varying steam demands and drum pressures. For a given volume of steam and blowdown leaving the steam drum, an equal amount of water should replace that inventory.

YS80/YS100 Retrofit

Yokogawa enjoyed strong sales of its line of YS80 instruments from their inception in 1980 to discontinuation in 2008. Thousands of the SLCD (single loop controller) and SLPC (programmable controller) where sold in the United States. As parts began to become scarce, the next generation of high-end controller was designed and released as the YS100 series.

Heat Control on a TV Picture Tube Production Line / Thomson Multimedia Polska Sp. zo.o. , Poland

Thomson provides a wide range of video technologies, fi nished products and services to consumers and professionals in the entertainment and media industries. In 2002, the company had sales of 10.2 billion Euros (US$9.6 billion). Thomson distributes its products and services under the Technicolor, Glass Valley, RCA and Thomson brand names.

Performance Improvement Of Smith Predictor Through Automatic Computation Of Dead Time

In process control it is not uncommon for systems to be affected by dead times, due to material transfer times. This is evident typically in pipelines. A fluid of density ρ and flow rate w in a section of pipe A the length of d takes the amount of time τ = ρAd/w to cover the whole distance (see Figure 1).