M3LR
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-2662-A Rev.2 P. 6 / 8
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 RTD wires are broken, the output goes over 100%
(below 0% with downscale protection) due to burnout
function.
Confirm the status indicator 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.
After the DIP SW setting is complete, set up the precise
input and output range using the front control buttons.
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”.
■
PREPARATION (e.g. M3LR-R4/A)
1) Mount the DIP-SW-configured M3LR on to a DIN rail.
2) Connect the M3LR to a reference resistor and a multim-
eter and to a DC power source as shown below.
7
8
11
12
M3LR
Multimeter
+
–
DC Power Source
+ –
1
2
4
5
B
4-wire
RTD
A
A
B
3) Turn the power supply on and wait for 10 minutes.
■
INPUT & OUTPUT RANGING
[Example] Setting the input to Pt 100, 0 – 100°C and the
output to 1 – 5 V DC
1) Run Mode: Confirm that the green LED is blinking (mod-
el M3LR-x/A) or the green LED turns on (model M3LR-
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 lev-
el (e.g. 100 Ω) from the reference resistor 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. 138.5 Ω) from the reference resistor 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 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.
8) Run Mode: When calibration is completed, press MODE
button once and confirm that: the LD1 green LED is
blinking in case of M3LR-x/A; and the LD1 green LED is
ON in case of M3LR-x/B.
