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

Introduction
7-1
Chapter 7. MVS-STX Calibration Menu
Chapter 7. MVS-STX
Calibration Menu
Auto Manual Linear
LoSpan
HiSpan
Zero_Cal
Disply
Reset
ScfCnt
ScfWgt
Zero_Cnt
Disply
Reset
On
Off
Set
Auto: set lo span, hi span, and zero calibration values while moving material
Manual: manually set scale factor counts, scale factor weight, and zero counts
Linear: set up and enable linearization table
Figure 7-1. Calibration Menu Tree
The Cal Menu is used to set up and calibrate
the STX’s ‘digital engine’ with the sensors (for
example, L-Cells, Microcells, Load Stand IIs,
Load Disc IIs, or Load Links).
• When the STX is in Digital Mode the MVS
display and outputs (setpoints, all current
outputs, and serial communications) are
based on this digital calibration.
• When the STX is in Analog Mode the
current output transmitted by the STX
PCB is based on the analog calibration,
which is detailed in Chapter 3, Stand-
Alone STX Analog Calibration and Setup.
However, the MVS display and the other
outputs (setpoints, current outputs from
the MVS’s Current Output PCB, and
serial communications) are still based on
the digital calibration described in
this chapter.
This chapter provides explanations of each of
the digital calibration parameters and detailed
navigation procedures through the menu tree
for each type of digital calibration.
As shown in Figure 7-1, the Cal Menu has
three submenus, described below:
• Auto — sets lo span, hi span, and zero
calibration values while moving material
into or out of the vessel. Auto
calibration will result in the
highest system accuracy.
• Manual — manually sets scale factor
counts, scale factor weight, and zero
counts. Use manual calibration to precalibrate
the system, fine-tune the
calibration, or re-enter previous
calibration data.
Cal
• Linear — sets up and turns on and off the
linearization table. Use this function if the
vessel’s structure responds non-linearly,
but consistently, to changes in load,
resulting in consistent, incorrect weight
readings after the system has been
correctly calibrated.
Auto
There are three methods for performing
automatic calibration:
• High-Accuracy Calibration
• Calibration by Adding a Known Quantity
of Material
• Calibration by Subtracting a Known
Quantity of Material
Each method requires moving a known
quantity of material, representing 25% of the
vessel’s total capacity, into or out of the
vessel. The latter two methods do not provide
as high accuracy calibration as the first
method. However, these lower accuracy
calibrations can be later refined to increase
the accuracy (see the topic Refining the
Calibration by Setting Zero in this section).
Note
See Appendix D, MVS-STX Error
Messages, for an explanation of error
messages you may encounter while
performing an Auto Calibration.