Implementing Control with a Backup Function

Load devices are sometimes used when evaluating (measuring) DUT performance. Depending on the parameter being evaluated, multiple controllers can be employed to control the performance of the load device, but there are also times when the load device uses only one actuator. Such cases call for wiring of a system with a switched input mechanism to the actuator.

The following is an example in which control output from 2 controllers is switched as needed, and intake control is performed by a single actuator.

Implementing control with a backup function 

Overview

  • The first controller performs temperature control using the temperature of the water from the DUT as a criterion.
  • The second controller performs heating control using the energy consumed in the load device as a criterion.
  • These controllers are separate, but the actuator at the load device is the same.

By using the control mode with backup function that comes standard with the UT55A UTAdvanced® Digital Indicating Controller, we can switch 2 outputs as necessary and rely on only one actuator for the intake control. Control output computed from temperature control is input to the UT55A (controller 2) and output as-is for control of the actuator. The control output signal to the actuator computed from heating control is output on a circuit switched by the contact input to the UT55A.

Heating control by the UT55A requires the acquisition of heat as measured values. Because it can acquire up to 4 points of analog input (direct input of temperature takes up to 2 points), the UT55A inputs the temperature of the water that passed through the DUT (A), and the temperature of the water that passed through the heat exchanger (B). It combines these temperature values with flow values and performs calculations using a UT55A ladder program such as the following.

【Ladder Program Calculation Example】

PV = (B - A) × flow × constant

A: Water temperature from DUT (A)
B: Water temperature from heat exchanger (B)
Flow: Flow value of water passing the heat exchanger
Constant: Correction value for calculation

Related Products & Solutions

JUXTA VJ 시리즈 신호 변환기

VJ 시리즈는 소형의 플러그인 형태로 다양한 애플리케이션을 수용 할 수 있으며 고사양형은 마이크로 컴퓨터 탑재의 고성능을 자랑합니다. 제 2 출력, 아날로그 출력, 상한 / 하한 경보 릴레이 출력 및 RS-485 MODBUS 통신을 설정할 수 있습니다. 

Mid-level UT55A/UT52A

UT55A/UT52A 온도 컨트롤러는 네비게이션 키와 함께 읽기 쉬운 14 세그먼트 대형 컬러 LCD 디스플레이를 채택하여 모니터링 및 작동 기능을 크게 향상시켰습니다. 또한, 래더 시퀀스 기능도 표준으로 탑재하고 있습니다. 컨트롤러의 깊이가 짧아 공간을 절약할 수 있으며 이더넷 통신과 같은 개방형 네트워크도 지원합니다.

UT35A/UT32A

UT35A/UT32A 온도 컨트롤러는 네비게이션 키와 함께 읽기 쉬운 14 세그먼트 대형 컬러 LCD 디스플레이를 채택하여 모니터링 및 작동 기능을 크게 향상시켰습니다. 또한, 래더 시퀀스 기능도 표준으로 탑재하고 있습니다. 컨트롤러의 깊이가 짧아 공간을 절약할 수 있으며 이더넷 통신과 같은 개방형 네트워크도 지원합니다.

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