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M5DYH2

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-2457  P. 2 / 2

TERMINAL CONNECTIONS

Connect the unit as in the diagram below or refer to the 
connection diagram on the front of the unit.

 

EXTERNAL DIMENSIONS  unit: mm [inch]

94 [3.70]

3 [.12]

25 [.98]

41 [1.61]

(3.3 [.13])

• When mounting, no extra space is needed between units.

DIN RAIL

35mm wide

8–M3.5 SCREW

7.3 [.29]

1 2

3 4

5 6

7 8

 

CONNECTION DIAGRAM

 

When used as DC Supply

 

When used as Isolator

1

6

5

8

7

+

2

+

*

1

HHC

*

1

HHC

INPUT

4

3

+

2-WIRE

XMTR

-

+

V

MONITOR

-

+

2-WIRE

XMTR

250Ω

250Ω

1

2

3

4

+

3

1

4

2

+

+

+

-

+

+

*

1. Hand-held communicator

OUTPUT

*

1

HHC

LOAD

POWER

WIRING INSTRUCTIONS

 

SCREW TERMINAL 

Torque: 0.8 N·m

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 

7 – 8 with a multimeter.

3) Input:  Check that the input signal is within 0 – 100% of 

the full-scale.

4) Output:  Check that the load resistance meets the de-

scribed specifications.

  For HART communication, the resistance must be 250 Ω 

±10%.

ADJUSTMENT PROCEDURE

This unit is calibrated at the factory to meet the ordered 
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case 
of regular calibration, adjust the output as explained in the 
following.

 

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.

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