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 the PLC to control the capacity position during
direct I/O control.
Control Input:
• This dropdown box is not used at this time.
Scale:
• Defi nes 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 13-4. Instruments Calibration Screen - Analog Inputs (Page 4)
13 – 4

Analog Inputs

This section of the Calibration screen allows the opera-
tor to defi ne the parameters of an installed auxiliary ana-
log instrument. These instruments are usually not part
of a typical compressor setup 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 13-4 and 13-5.
Device Calibration:
• These setpoints allow the operator to defi ne 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.
Offset:
• Once the two-point calibration is completed, it is not
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9