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47LLC OPERATING MANUAL EM-9505-B Rev.4
2. BAsIC sETTING AND OPERATION
2.1 BAsIC sETTING
This section describes flow and procedure of the basic setting.
The following shows the flow and procedure to set the display to 0.0 – 300.0 kg using a strain gauge with rated load 300
kg, rated output 2 mV/V and recommended excitation voltage 5 V as an example.
2.1.1 BAsIC sETTING FLOW
The basic setting includes “setting scaling values with parameters” and “setting scaling values with actual load”. Each set-
ting is as shown in the following flowcharts.
■
sETTING sCALING VALUEs WITH PARAMETERs
■
sETTING sCALING VALUEs WITH ACTUAL LOAD
2.1.2 INPUT sCALING
To set the input scaling, it is necessary to calculate output voltage from a strain gauge. In the above setting example, when
the rated load is applied with excitation voltage 1 V, the output voltage is 2 mV.
With excitation voltage 5 V,
Strain gauge output voltage = rated output × excitation voltage
2 mV/V × 5 V = 10 mV
The output voltage is 0 mV without any load. Therefore the output range from the strain gauge is 0 – 10 mV DC.
Set the input scaling as shown below.
Input scaling value A: 0.00 mV
Input scaling value B: 10.00 mV
2.1.3 RELATION BETWEEN INPUT sCALING AND DIsPLAY sCALING
The relation between input scaling and display scaling is as shown in the following figure and chart.
Input scaling: 0% input value (input scaling value A) and 100% input value (input scaling value B)
Display scaling: 0% display value (display scaling value A) and 100% display value (display scaling value B)
Setting
input
scaling
value A
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
STEP 8
Setting
excitation
voltage
Setting
input
scaling
value A
Setting
display
scaling
value A
Setting
input
scaling
value B
Setting
display
scaling
value B
Setting
decimal
point
position
Starting
measurement
Power ON
Setting
input
scaling
value A
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
STEP 8
Setting
excitation
voltage
Setting
input
scaling
value A
Setting
display
scaling
value A
Setting
load
ratio
Setting
display
scaling
value B
Setting
decimal
point
position
Power ON
Starting
measurement
Setting
input
scaling
value B
STEP 9
*
Use the Teach Calibration function to set the input scaling values A and B.
Input scaling
Display scaling
Display value
Input value
Input scaling value B
10.00 mV
Display scaling value B
300.0 kg
Input scaling value A
0.00 mV
Display scaling value A
0.0 kg
300.0 kg
0.0 kg
0.00 mV
10.00 mV