M-system M3LR Instruction Manual page 5

CHECKING
1 ) Terminal wiring: Check that all cables are correctly
connected according to the connection diagram.
2 ) DIP SW setting: Check that the switches are set to
appropriate positions.
3 ) Power input voltage: Check voltage across the termi-
nal 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
described 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" in the following page.
■ 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 multi-
meter and to a DC power source as shown below.
M3LR
4-wire
RTD
1
A
2
B
4
A
5
B
3 ) Turn the power supply on and wait for 10 minutes.
Multimeter
+
7 –
8
DC Power Source
11
+ –
12
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■ INPUT & OUTPUT RANGING
[Example] Setting the input to Pt 100, 0 – 100°C and the
output to 1 – 5V DC
1 ) Run Mode: Confirm that the green LED is blinking
(model M3LR-x/A) or the green LED turns on (model
M3LR-x/B).
2 ) Input Configuration Mode: Press 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. 100Ω) from the reference resistor and push
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. 138.5Ω) from the reference resistor and
push 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 Configuration Mode: Push MODE button and
confirm that the LD3 red LED instead of LD2 is blink-
ing.
6 ) 0% Output Ranging: Increase or decrease the simu-
lated input until the meter shows the desired mini-
mum output level (e.g. 1V). Push 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
simulated input until the meter shows the desired
maximum output level (e.g. 5V). Push 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: Programming complete, push MODE
button and confirm that only the LD1 green LED is
blinking.
M3LR
EM-2662-A P. 5 / 7