M2LCS
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-5047 Rev.5 P. 3 / 3
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal
10 – 11 with a multimeter.
3) Strain gauge: Check the bridge resistance. The maxi-
mum current supplied to the strain gauge is 35mA.
4) Input: When applying maximum load, check voltage
across the terminal 1 (+) – 2 (–) equals Exc. × Strain
Gauge Sensitivity.
5) Output: Check that the load resistance meets the de-
scribed specifications.
ADJUSTMENT PROCEDURE
Fine Zero Adj.
Excitation Adj.
16-position
Coarse Zero Adj.
16-position
Coarse Span Adj.
Fine Span Adj.
Auxiliary
Coarse Zero Adj.
1) Excitation Adj.: The excitation voltage is calibrated at
the factory, therefore will not usually require adjustment,
except when used in combination with a strain gauge of
sensitivity other than described on the specifications.
In that case, adjust to the value calculated by the follow-
ing equation:
Excitation [V] =
5 [V] × a [mV/V]
b [mV/V]
where a: Factory set sensitivity value marked on the product
b: User’s sensitivity value
Adjustable range is within 2V to 10V with bridge resist-
ance of 350Ω. When the calculated value exceeds 10V,
adjust it to 10V.
2) Coarse Zero Adj.: Tare adjustment. Approx. 5% of input
span adjusted with each increment. Max. 80% with 16
positions.
Without any load, adjust the output to 0%.
3) Fine Zero Adj.: Used for fine tare adjustment.
4) Coarse Span Adj.: Gain adjustment. 100 – 20% of input
span adjusted with 16 positions.
With 100% load, adjust the output to 100%.
5) Fine Span Adj.: Used for fine gain adjustment.
6) Coarse Zero Adj. (auxiliary): Used when the zero can-
not be adjusted with only the coarse and fine zero adjust-
ments.
After coarse adjustment, turn the fine zero adj. to the
middle position and adjust the output to zero.
When not in use, the trimmer should be turned fully
clockwise.
MAINTENANCE
Regular calibration procedure is explained below:
■
CALIBRATION
Warm up the unit for at least 10 minutes. Apply 0%, 25%,
50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accu-
racy described in the data sheet. When the output is out of
tolerance, recalibrate the unit according to the “ADJUST-
MENT PROCEDURE” explained earlier.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protector for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.
