model 2704 controller installation and operation handbook - Soliton

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Transducer Scaling 2704 Controller 19. Chapter 19 Transducer Scaling 19.1. WHAT IS TRANSDUCER SCALING? Transducer scaling is a software function block which provides a method of offsetting the calibration of the controller input when compared to a known input source. Transducer scaling is often performed as a routine operation on a machine to take out system errors. In the case of a load cell, for example, it may be necessary to zero the scale when a load is removed. Transducer scaling can be applied to any input or derived input, i.e. the PV Input, Analogue Input or Modules 1, 3, 4, 5, or 6. In practice, however, it is unlikely that transducer scaling would be required on every input and so the 2704 controller includes three transducer calibration function blocks. These can be wired in configuration level to any three of the above inputs. Four types of calibration are explained in this chapter:- 1. Shunt Calibration 2. Load Cell Calibration 3. Comparison Calibration 4. Auto-tare 19-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr -00
2704 Controller Transducer Scaling 19.2. SHUNT CALIBRATION Shunt calibration is so called since it refers to switching a calibration resistor across one arm of the four wire measurement bridge in a strain gauge transducer. It also requires the use of a Transducer Power Supply module wired as shown in Figure 2-13. The strain gauge transducer is calibrated as follows: 1. Remove any load from the transducer to establish a zero reference. 2. Enter ‘Scale Low’ and ‘Scale High’ values which are normally set at 0% and 80% of the span of the transducer. 3. Start the procedure using the low point calibration parameter ‘Start Pnt1 Cal’, or a digital input wired to this parameter. The controller will automatically perform the following sequence: 1. Disconnect the shunt resistor 2. Calculate the low point calibration value by continuously averaging two lots of 50 measurements of the input until stable readings are obtained 3. Connect the shunt resistor 4. Calculate the high point calibration value by averaging two lots of 50 measurements of the input Strain gauge C Controller under Calibration B A Transducer power supply D Figure 19-1: Strain Gauge Calibration Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 19-3
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model 2704 controller installation and operation handbook - Soliton

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