Yokogawa PC-Based MX100 - Manual (Page 42)

2-28 IM MX180-01E
The results of initial balancing are as follows.
Status box dsplay Status
----- Not executed
Successful Initial balancing was executed successfully.
Failed Initial balancing failed.
OVER Initial balancing succeeded, but the output value exceeded the upper
limit or fell below the lower limit, and the value was rounded to the
upper limit value or the lower limit value.
Executing Executing initial balancing
Note
If initial balancing fails, “ ” is displayed in the 7-segment LED on the main module.
Check the installation status of the strain input module and perform the initial balancing again.
If the error occurs even after rebalancing, servicing is required. Please contact your nearest
Yokogawa representative.
Scalng Settngs When Usng a Stran Gauge Type Sensor
The following is an explanation of scaling settings used when measuring physical
quantities such as load and length with a strain gauge type sensor.
The basic relational expression is as follows.
1 mV/V = 2000 µstran (Equaton 1)
Two examples are given below: 1) when rated input and output are listed in the user’s
manual of the strain gauge type sensor, and 2) when listed with the calibration coefficient.
(hereinafter, “µstrain” will be expressed as “µStr.”)
When Rated Input and Rated Output Are Gven
A specific example is given below.
• Rated input 200 N
(set to Y)
• Rated output 0.985 mV/V (set to K)
In this case, these figures indicate that if a 200 N load is applied, 0.985 mV/V is output.
From the relationship in equation 1, if 200 N is applied,
an output of 0.985 mV/V=0.985×2000=1970 µSTR is attained.
In other words, for each 1 N, 1970 µSTR/200N= 9.85 µSTR/N is output.
Therefore, the scaling settings are entered as follows.
When Measuring at 50-150 N
Scale minimum: 50
(units: N) (set to Smin)
Scale maximum: 150 (units: N) (set to Smax)
therefore,
Span minimum: 50×9.85mSTR/N = 492.5 µSTR
Span maximum: 150×9.85 =1477.5 µSTR
...can be set.
Thus, the measuring range is 2000 µSTR.
2.4 Settng the Measurement Condtons (Settng the Measurement Channels)