Remote Capacity; Analog Inputs - Emerson Vilter Vission 20/20 Operation And Service Manual

Section 13 • Instruments Calibration

Remote Capacity

The remote capacity input allows a system controller
(such as a PLC) to control the capacity position during
direct I/O control.
Control Input:
• This dropdown box is not used at this time.
Scale:
• Defines the minimum and maximum Capacity posi-
tion between 0% & 100% for the 4-20ma input.
Offset:
• Used to correct any error in the capacity position. By
entering a value into the Adjustment entry box, that
value will be added to the total offset displayed in the
"total offset" entry box.
Figure 13-6. Instruments Calibration Screen - Analog Inputs (Page 4)
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7

Analog Inputs

This section of the Calibration screen allows the operator
to define the parameters of an installed auxiliary analog
instrument. These instruments are usually not part of a
typical compressor set-up but Vission 20/20 provides a
way for the operator to add additional capabilities. The
layout of this screen is typical to the pressure and tem-
perature calibration screens. For Analog Inputs screens,
see Figures 13-6 and 13-7.
Device Calibration:
• These setpoints allow the operator to define what the
input from the auxiliary instrument means in terms
of units and range. If a temperature measuring in-
strument is connected, then the operator would se-
lect temperature from the Unit drop-down box then
set the maximum and minimum value for the scale.
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