TERMINAL CONNECTIONS
Connect the unit as in the diagram below or refer to the connection diagram on the top of the unit.
■
EXTERNAL DIMENSIONS unit: mm (inch)
76 (2.99) dia.
40 (1.57)
52.5 (2.07)
1 (.04)
60.9 (2.40)
46 (1.81)
50 (1.97)
4–M3 (.12) TAP
6 (.24) deep
1 2 3 4
5 6
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CONNECTION DIAGRAM
+
–
3
1
2
4
+
–
STRAIN
GAUGE
+
–
LOAD
6
5
OUTPUT
24V DC
4 – 20mA DC
INPUT
EXC.
WIRING INSTRUCTIONS
■
SCREW TERMINAL
Torque: 0.6 N·m
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Strain gauge: Nominal bridge resistance of strain gauges
that can be connected to the unit is 350 Ω or greater.
3) Input: Check that the input signal is within 0 – 100% of
the full-scale. When applying maximum load, check that
voltage equals Exc. × Strain Gauge Sensitivity.
4) Output: Check that the load is within the permissible
limit including wiring resistance.
Load Resistance (Ω) =
Supply Voltage (V) – 13 (V)
0.02 (A)
(including leadwire resistance)
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following. Zero and Span adjustments are located behind
the top cover. Release the knurled knobs and open the cover.
1
2
3
4
5
6
VR1
VR2
■
HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
1) ZERO: Apply 0% input and adjust output to 0% with the
VR1.
2) SPAN: Apply 100% input and adjust output to 100% with
the VR2.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above proce-
dure 1) – 3).
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.
6LC
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
EM-4235 Rev.4 P. 2 / 2
