M-system Mini-M M2RT Instruction Manual page 2

TERMINAL CONNECTIONS
Connect the unit as in the diagram below or refer to the connection diagram on the side of the unit.
■ EXTERNAL DIMENSIONS unit: mm (inch)
21.5 (.85) 10 (.39)
■ CONNECTION DIAGRAM
RTD
1
A
4
B
5
B
WIRING INSTRUCTIONS
■ SCREW TERMINAL
Torque: 0.8 N·m
■ SOLDERLESS TERMINAL
Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable.
Applicable wire size: 0.25 to 1.65 mm
Recommended manufacturer: Japan Solderless Terminal
MFG.Co.Ltd, Nichifu Co.,ltd
3.3 (.13) max
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal
13 – 14 with a multimeter.
3) Input: Check voltage across the terminal 1 – 4 with a
sensitive voltmeter (with 20°C or 68°F, approx. 220mV
with Pt 100, approx. 110mV with Pt 50Ω).
If RTD wires are broken, the output goes over 100%
(below 0% with downscale) due to the burnout function.
Check leadwires in such a case.
4) Output: Check that the load resistance meets the de-
scribed specifications.
84 (3.31)
114 (4.49)
• When mounting, no extra space is needed between units.
9 +
OUTPUT
12 –
13
U(+)
POWER
14
V(–)
(AWG 22 to 16)
2
mm (inch)
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
DIN RAIL
35mm wide
8
2–4.2x5
(.17x.20)
MTG HOLE
6 (.24) deep
12
8–M3
SCREW
14 13
15 (.59)
[4 (.16)] 23 (.91)
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
The output signal can be finely adjusted to match it to a re-
ceiving instrument, or to compensate input wire resistance
when the unit is combined with a zenor barrier. Follow the
regular calibration procedure explained below:
■ 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%.
2) SPAN: Apply 100% input and adjust output to 100%.
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.
M2RT
6 (.23)
4 1
5
9
EM-5129 Rev.2 P. 2 / 2