M3LM
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-2663-A Rev.3 P. 5 / 7
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INPUT TYPE & RANGE
Table 7
INPUT TYPE
MINIMUM SPAN
MAXIMUM RANGE
Potentiometer
2.5 Ω
3 Ω
3 Ω
10 Ω
10 Ω
0 – 90 Ω
0 – 200 Ω
0 – 400 Ω
0 – 1000 Ω
0 – 20 kΩ
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OUTPUT TYPE & RANGE
Table 8
OUTPUT TYPE
MINIMUM SPAN
MAXIMUM RANGE
CONFORMANCE RANGE
DC Current
DC Voltage, Narrow Spans
DC Voltage, Wide Spans
1 mA
250 mV
1 V
0 to 20 mA
-2.5 to +2.5 V
-10 to +10 V
0 to 24 mA
-3 to +3 V
-11.5 to +11.5 V
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) DIP SW setting: Check that the switches are set to ap-
propriate positions.
3) Power input voltage: Check voltage across the terminal
11 – 12 with a multimeter.
4) Input: Check that the input signal is within 0 – 100% of
full-scale.
If the potentiometer or its extension wires are broken,
the output goes over 100% (below 0% with downscale pro-
tection) due to burnout function. Confirm the status indi-
cator LED pattern and check leadwires in such a case.
5) Output: Check that the load resistance meets the de-
scribed specifications.
I/O RANGING & FINE ADJUSTMENTS
After the DIP SW setting is complete, set up the precise
input and output range using the front control buttons. Be
sure that the front control button function is enabled with
the DIP switch setting.
The front LEDs’ colors and blinking patterns help you to
easily identify the transmitter’s status and confirm the set-
up actions in each step of Calibration Modes. Please read
the following explanations referring to “Calibration Flow
Chart”.
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PREPARATION (e.g. M3LM-R4/A)
1) Mount the DIP-SW-configured M3LM on to a DIN rail.
2) Connect the M3LM to a potentiometer and a multimeter
and to a DC power source as shown below.
3) Turn the power supply on and wait for 10 minutes.
7
8
11
12
M3LM
Multimeter
+
–
DC Power Source
+ –
4
5
1
+
–
3
2
1
POTENTIOMETER
max.
min.
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INPUT & OUTPUT RANGING
[Example] Setting the input to 0 – 1000 Ω and the output
to 1 – 5 V DC
1) Run Mode: Confirm that the green LED is blinking (mod-
el M3LM-x/A) or the green LED turns on (model M3LM-
x/B).
2) Input Ranging Mode: Hold down MODE button for longer
than 5 seconds until the LD1 red LED is ON and the LD2
red LED is blinking.
3) 0% Input Ranging: Apply the desired minimum input
level (e.g. 0 Ω) from the potentiometer and hold down
DOWN button until the LD1 blinks for approx. 2 sec. and
then turns OFF. When you release the button, the LD1 is
returned to ON.
The blinking LD1 means that the value is stored in the
memory. If the LED does not change, the entered level
may be inappropriate: too small a span, or out of usable
range (same for all steps).
4) 100% Input Ranging: Apply the desired maximum input
level (e.g. 1000 Ω) from the potentiometer and hold down
UP button until the LD1 blinks for approx. 2 sec. and
then turns OFF. When you release the button, the LD1 is
returned to ON.
5) Output Ranging Mode: Press MODE button and confirm
that the LD3 red LED instead of LD2 is blinking.
6) 0% Output Ranging: Increase or decrease the simulated
input until the meter shows the desired minimum output
level (e.g. 1 V). Hold down DOWN button until the LD1
blinks for approx. 2 sec. and then turns OFF. When you
release the button, the LD1 is returned to ON.
7) 100% Output Ranging: Increase or decrease the simu-
lated input until the meter shows the desired maximum
output level (e.g. 5 V). Hold down button until the LD1
blinks for approx. 2 sec. and then turns OFF. When you
release the button, the LD1 is returned to ON.
8) Run Mode: When calibration is completed, press MODE
button once and confirm that: the LD1 green LED is
blinking in case of M3LM-x/A; and the LD1 green LED is
ON in case of M3LM-x/B.
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ZERO & SPAN ADJUSTMENTS
After the transmitter is installed and operational, fine zero
and span tuning can be performed as explained below. Both
zero and span are adjustable within ±15%.
1) Run Mode: Confirm that the green LED is blinking (mod-
el M3LM-x/A) or the green LED turns on (model M3LM-
x/B).
2) Fine Zero Adjustment Mode: Hold down MODE button
for 1 or 2 seconds until the LD1 red LED is ON and the
LD2 green LED is blinking.
Use UP (increase) and DOWN (decrease) buttons to ad-
just the output to 0%.
