MG 43 Series - Correction of Display Scaling

4743DV2 EM-9422-B Rev.3
MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
10.2 CORRECTION OF DISPLAY SCALING
Calculate the display scaling values using the correction values. Refer to 4. SETTING DISPLAY SCALING to set them.
Correction value 0% = desired display value 0% – actual display value 0% + desired display value 0%
Correction value 100% = desired display value 100% – actual display value 100% + desired display value 100%
Example 1: setting the display to 0.0 – 100.0% for the input 4 – 20 mA DC with the input code ‘SA’. Actual display 0.2 –
99.8%.
Calculate correction value 0 and 100%.
Correction value 0% = 0 – 2 + 0 = -2
Correction value 100% = 1000 – 998 + 1000 = 1002
As the measurement range is the same as the input, set the display scaling as follows:
Display scaling value A = -002
Display scaling value B = 1002
Example 2: setting the display to 0.0 – 100.0% for the input 6 – 16 mA DC with the input code ‘SA’. Actual display 0.2 –
99.8%.
Calculate correction value 0 and 100%.
Correction value 0% = 0 – 2 + 0 = -2
Correction value 100% = 1000 – 998 + 1000 = 1002
As the measurement range is different from the input, calculate the display scaling value A and B. Replace the desired
display values and the display span with the correction values and their span.
SA =
4 × 1004 + (-2) × 16 – 1002 × 6
10
=
4016 – 32 – 6012
=
-2028
= -202.8 ≈ -203
10 10
SB =
20 × 1004 + (-2) × 16 – 1002 × 6
10
=
20080 – 32 – 6012
=
14036
= 1403.6 ≈ 1404
10 10
From the above calculations, set the display scaling as follows:
Display scaling value A = -203
Display scaling value B = 1404