3-8
On Board I/O Calibration
Overview
The calibration mode enables the calibration of the Analog Inputs, Analog Outputs and
Pulse Inputs.
Hold Mode
When calibrating, PCCU will instruct the XRC to ignore live values for the
period of time the XRC is being calibrated. This prevents real time XRC
calculations from being affected during the calibration. During this time the
XRC uses the last known value at the time calibration mode was entered.
(This is called the “HOLD” mode.)
To exit the Hold mode, perform any of the following:
1. Unplug DATA cable at XRC connector
2. Exit Calibration mode
Analog Input Calibration
Overview
The Totalflow XRC comes standard with 5 analog inputs on the XRC-195
Board (see Figure 3–2). As you enter calibration, the XRC enters the Hold
Mode and displays the current values. To see a complete overview of the
XRC-195 Board, see Figure 1–5.
The Current Values section will display the current values continuously by
checking the "Update" box. When different analog inputs are selected, their
assigned register numbers are displayed on the top of the screen.
Follow the instructions in the PCCU32 Help files for specific software steps.
Generally you need to complete the following procedures.
Instructions
Step Procedure
1.
From the Local Connect screen in PCCU32, select Calibrate.
2.
In Tree View window, open Onboard I/O by clicking on the “+” .
3.
Under Onboard I/O, click on Analog In’s. Select either the AI 1 tab
or the AI 2 tab.
4.
Connect an accurate power source capable of 1 - 5 volts or 4 - 20
ma to the AI terminals to be calibrated. Make sure the jumpers on
the termination panel are in the 4 - 20 ma position if a 4 -20 ma
source is used. This puts a 250 ohm resistor across the terminals
to convert the 4 - 20 ma to 1 - 5 volts.
5.
Under Calibration, select either 3 Point or 5 Point for number of
calibration points. 3 Point for low, 50% and 100% values and 5
Point for low, 25%, 50%, 75% and 100% values.
Continued on Next Page
Summary of Contents for XRC6490
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Page 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Page 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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