M8XR2
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-5471 Rev.4 P. 4 / 4
LEADWIRE RESISTANCE COMPENSATION
Unbalances in resistance between RTD wires can be com-
pensated as explained below:
■
HOW TO COMPENSATE LEADWIRE RESISTANCE
Leadwire resistance compensation can be done with the
ZERO/SPAN Selector and UP/DOWN switches.
Turn the power supply on and warm up for more than 10
minutes.
1) Short across the tips of RTD sensor.
2) Slide the Zero/Span Selector to the position Z while press-
ing DOWN switch. Confirm the LED pattern showing
“Leadwire Resistance Compensation Mode” and release
the DOWN switch.
3) Press DOWN switch to execute the compensation. Con-
firm that the LED turns off when you press DOWN
switch.
4) Put the Zero/Span Selector back to the position OFF.
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HOW TO RESET
While in the Leadwire Resistance Compensation Mode,
you can reset the calibrated status to its ex-factory state by
pressing both UP/DOWN switches at once. Confirm that
the LED turns off when you press these switches.
I/O RANGE MODIFICATION
Configurator Software is used to change input types and
ranges.
For changing output ranges, set the Output Range Selector
and then select by Configurator Software.
■
SIDE VIEW
Output Range Selector
V
I
I
V
I
Output Range Selector
OUTPUT RANGE
SW POSITION
V2Z1: -10 – +10 V / 0 – 20 mA DC
I
V2V2: -10 – +10 V / -10 – +10 V DC
V
STATUS INDICATOR LED
The unit is provided with a status indicator LED which
blinks in different patterns indicating various status of its
CPU. When it is functioning within normal parameters, the
LED blinks in a regular pattern of ON and OFF.
The following figure indicates typical patterns.
LED PATTERNS
STATUS
Normal
Programming Mode
Out. 1 Calibration Mode
Out. 2 Calibration Mode
Burnout
Leadwire Resistance
Compensation Mode
100 ms
ON
OFF
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 “CALIBRA-
TION” 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.
