ABB RMC-100 - Defining Engineering Unit Range for AO

2105552MNAE | RMC-100 | 163
Figure 7-53: AO current value set to 8 mA
d. Verify that the measured value on the ammeter matches or is approximately the typed value
in the mA field.
e. Re-verify with additional values, if necessary.
17. Proceed to section 7.2.3
, Define engineering unit if the AO must reflect different engineering
units.
18. If keeping the default engineering unit range (4-20 mA) click Auto Mode and Close to exit
calibration.
IMPORTANT NOTE:
Auto Mode takes the AO out of hold to resume normal operation.
7.2.3 Define engineering unit range
The engineering units fields permit a scale that is different from the default 4-20 mA range. This
means that the AO values do not display in electrical current values, but in user-specified units. The
values represent engineering units scaled across the 4-20 mA range. For example, the default output
range can represent a pressure measurement value range of 0 to 100 PSI where 4 mA represents 0
and 20mA represents 100. The engineering units and range associated with the analog outputs
depend on the external device specifications or the application driving the AO.
IMPORTANT NOTE:
Define the engineering units after calibration and while the analog output
screen is still in manual mode. This procedure defines an engineering unit range of 0
-100 PSI.
Different applications might require different ranges or units. Use values that are appropriate for
your specific scenario and the external equipment specifi
cations.
To define the engineering unit range:
1. Click Manual Mode.
2. Click Low in the Engineering Units column. The Enter Low Value dialog displays (Figure 7-54
).