STX Signal Transmitter Installation and Operation ... - Kistler-Morse

Chapter 3. Stand-Alone STX Analog Calibration and Setup
Chapter 3. Stand-Alone STX
Analog Calibration and Setup
Introduction
This chapter contains the procedures to
perform an analog calibration, set up system
parameters for the STX, and use the STX’s
remote tare feature.
Analog Calibration
Analog calibration calibrates the STX’s
‘analog engine’ with the sensors wired to the
STX (for example, L-Cells, Microcells, Load
Stand II, Load Disc II, or Load Link):
• When the STX is in Analog Mode, the
current output transmitted by the STX
PCB is based on the analog calibration.
However, any digital outputs (such as
to an MVS or PLC) are based on the
digital calibration.
• When the STX is in Digital Mode, the
current output transmitted by the STX
PCB and any digital outputs (such as
to an MVS or PLC) are based on the
digital calibration.
The calibration described in this chapter
is valid only when the STX is in Analog
Mode. If the STX is in Digital Mode, the STX
will ignore the analog calibration. Refer to the
appropriate reference for digital calibration:
• Chapter 7, MVS-STX Calibration Menu
• Appendix B, Serial Commands
• Applicable PLC manual —
KM-RIO Installation and Operation
Manual, MVS-RIO Installation and
Operation Manual, or MVS-Modbus
Installation and Operation Manual
Note
Before performing analog calibration,
you must set up the current output
mode (0-20 or 4-20 mA). See Setting
Up Current Output Operating Mode.
Setting Up Current
Output Operating
Mode (0-20 or 4-20 mA)
Note
The default mode is 4-20 mA. If that
is the desired mode of operation,
skip this section and proceed to
Analog Calibration.
The STX’s current transmitter can be set up
to output 0-20 mA or 4-20 mA. The 0-20
mode has a minimum current output of 0 mA
and a maximum output of 20 mA. The 4-20
mode has a minimum current output of 4 mA
and a maximum output of 20 mA. Follow this
procedure to select the operating mode:
1. If the STX is off, apply power and let it
warm up for at least 15 minutes.
2. Place SW3 in the position corresponding
to the desired mode of operation, 0-20 or
4-20 mA.
3. Immediately after placing SW3 in the
desired position, press SW1 and SW2
simultaneously to enter the selected
mode in memory.
Note
If you do not press SW1 and SW2
within 15 seconds of placing SW3 in
the desired position, the STX disables
SW1 and SW2. If this occurs, move
SW3 out of and back into the desired
position and repeat Step 3.
Analog Calibration
There are three methods for performing an
analog calibration:
• High-accuracy calibration
• Calibration by adding a known quantity
of material
• Calibration by subtracting a known
quantity of material
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