ABB XSeries G4 6200, Руководство пользователя, Страница: 124 / 168

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17) When the current reading stabilizes, accept the target value already
showing in the window; otherwise, enter the pressure value from calibration
source. Click the OK button.
18) Repeat steps 15 through 17 until all calibration ports have been entered.
19) Upon completion of the DP calibration, new calibration markers should be
set.
20) Return the manifold to service before exiting Calibration mode.
For additional information regarding Differential Pressure
Calibration mode, see PCCU32 Help Files.
4.14 Onboard I/O calibration overview
The Calibration mode enables the calibration of the analog inputs, analog outputs
and pulse inputs.
4.14.1 Hold mode
When calibrating, PCCU32 will instruct the G4 EX to ignore live values for the
period of time that the G4 EX is being calibrated. This prevents real-time G4 EX
calculations from being effected during calibration. During this time, the G4 EX
uses the last known value at the time Calibration mode was entered. This is
referred to as a Hold mode.
To exit Hold mode:
1) Exit Calibration mode.
2) Unplug the PCCU cable at the G4 EX connector.
4.14.2 Calibrating onboard analog inputs
The G4 EX comes standard with two analog inputs on the G4 EX board. As the
user enters Calibration mode, the G4 EX moves into Hold mode and displays the
current values.
When the user selects the Update checkbox, the Current Values section will
display the current values continuously. 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, the user will need perform the following procedures:
If the user intends to use a 4-20 mA transmitter on the analog
input, please refer to Appendix X. Manufacturer’s
specifications can often lead to confusion. In some
instances, the manufacturer’s specifications will claim to
operate from 10 to 30 VDC. They are not always clear that
this 10-30 VDC must be applied across the 4-20 mA
transmitter only (and not across the transmitter/load resistor
series combination). Again, refer to the explanation in the
appendix.