YOKOGAWA JUXTA MH7D User manual

Model MH7D
Isolator
(Dual-output and Unied
Signal Type)
CAUTIONARY NOTES FOR SAFE USE OF THE
PRODUCT
This User’s Manual should be carefully read before installing and
operating the product. Please keep this User’s Manual for future
reference.
The related manuals and general specications are shown in the
table below.
Doc. Name Doc. Number
Model MH7D Isolator (User’s Manual) IM 77J04H07-02E
(This manual)
Model MH7D Isolator (General Specications) GS 77J01H07-02E
User’s manuals in the above table are essential parts of the
product; keep it in a safe place for future reference.
This manual is intended for the following personnel;
• Engineers responsible for installation, wiring, and maintenance
of the equipment.
• Personnel responsible for normal daily operation of the
equipment.
The following symbol is used on the product and in this manual to
ensure safe usage.
WARNING
Calls attention to actions or conditions that could
cause serious or fatal injury to the user, and indicates
precautions that should be taken to prevent such
occurrences.
CAUTION
Calls attention to actions or conditions that could
cause injury to the user or damage to the instrument
or property and indicates precautions that should be
taken to prevent such occurrences.
CHECKING PRODUCT SPECIFICATIONS
AND PACKAGE
(1) Checking the Model and Product Specications
Check that the model and specications indicated on the
nameplate attached to the main unit are as ordered.
(2) Packaged Items
Check that the packing carton contains the following items:
• MH7D: 1
• Receiving resistor (for currrent input): 1
• Spacer (used for DIN rail mounting): 1
• User’s Manual (this manual: IM 77J04H07-02E): 1 copy
GENERAL
This plug-in type isolator receives 4 to 20 mA DC current or 1 to 5
V DC voltage signals to convert them into isolated 4 to 20 mA DC
current or 1 to 5 V DC voltage signals.
IM 77J04H07-02E
3rd Edition June 2018 (YK)
MODEL AND SUFFIX CODES
Model Su󰀩x codes Description
MH7D -x x x -x /x Isolator
Input
signal
-A 4 to 20 mA DC
-6 1 to 5 V DC
Output-1
signal
A4 to 20 mA DC
61 to 5 V DC
Output-2 signal A4 to 20 mA DC
61 to 5 V DC
Power supply
-3 24 V DC ±10%
-4 100-130 V AC/DC *1
-5 200-240 V AC *2
Option
/SN No socket (with socket if not specied)
/C0 Coating
/FB Fuse bypass
*1 Operating range: 85 to 150 V AC/DC
*2 Operating range: 170 to 264 V AC
User’s
Manual
1
Thank you for purchasing the JUXTA Signal Conditioner.
Please read through this manual before use for correct handling.
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: [phone] Facsimile: [phone]
http://www.yokogawa.com/ns/juxta/im/
You can download the latest manuals from the following website:

1. MOUNTING METHOD
CAUTION
●Plug/disconnect the main unit into/from the
socket vertically to the socket face. Otherwise the
terminals may bend and it may cause bad contact.
●The converter shall not tilt 5 degrees or more in
either direction when installed.
●When the converter is not connected to the socket,
it is necessary to protect the socket against ingress
of dust to the connector part.
●Keep this product in a conductive bag when
plugged out, during transport or storage.
1.1 Wall Mounting
Remove the stoppers (top and bottom) from the product and pull
out the main unit from the socket. Fix the socket on the wall using
two M4 screws. Next, insert the main unit into the socket and
fasten the main unit with the stoppers (top and bottom).
5 or more
(51)
(85)
Socket
Socket
Stopper
Main unit
Mounting
screws
<Mounting Dimensions>
Unit: mm
40±0.2
Pitch: 55 or more
2-ø4.5 or 2-M4
Note:
(1) More than 5 mm interval is
required for side-by-side
close mounting.
(2) Use the supplied spacer for
DIN rail mounting to keep 5
mm interval.
1.2 DIN Rail Mounting
Insert a DIN rail into the upper part of the DIN rail groove on the
rear of the socket, and then slide the slide lock at the lower part of
the socket upwards until the socket is xed into position as shown
below.
Slide lock
Spacer
DIN rail
DIN rail
Fit into here
Push
(Rear of the socket)
1.3 Using a Duct
When using a wiring duct, install the duct at leaset 20 mm away
from the top and bottom faces of the main unit.
2. INSTALLATION LOCATIONS
• Avoid the following environments for installation locations:
Areas with vibration, corrosive gases, dust, water, oil, solvents,
direct sunlight, radiation, a strong electric eld, and/or a strong
magnetic eld
• If there is any risk of a surge being induced into the power
line and/or signal lines due to lightning or other factors, a
dedicated lightning arrester should be used as protection for
both this unit and a eld-installed device.
3. EXTERNAL WIRING
WARNING
●To avoid the risk of an electric shock, turn o󰀨 the
power supply and use a tester or similar device to
ensure that no power is supplied to a cable to be
connected, before carrying out wiring work.
●Do not operate the product in the presence of
ammable or explosive gases or vapors. To do so is
highly dangerous.
●Use of the product ignoring the specications may
cause overheating or damage. Before turning on
the power, ensure the following:
•Power supply voltage and input signal value
applied to the product should meet the required
specications.
•The external wiring to the terminals and wiring to
ground are as specications.
Wiring should be connected to the terminals on the socket
of the product. The terminals for external connections are of
M3.5 screws. Use crimp-on terminal lugs for connections to the
terminals.
• Recommended cables: A nominal cross-sectional area of
0.5 mm2or thicker for signal cables, and that of 1.25 mm2or
thicker for power cables.
10 11 1 2
39
8 7 6 5
4
L+
N–
GND
1
2
+
–
10
11
+
–
9
7
8
5
6
+
–
Ri
Power Supply
Output-2 Output-1
Input
Receiving resistor
for current input
Ri : 250 Ω
external receiving
resistor for current input
(RES-250)
CAUTION
●The power line and input/output signal lines should
be installed away from noise-generating sources.
Other wise accuracy cannot be guaranteed.
●Make sure to earth ground the ground terminal
through minimum resistance. The length and
thickness of the grounding cable should be as
short and thick as possible. Directly connect the
lead from the ground terminal (terminal no. 9) of
the product to the ground. Do not carry out daisy-
chained inter-ground terminal wiring.
●The product is sensitive to static electricity;
exercise care in operating it. Before you operate
the product, touch a nearby metal part to discharge
static electricity.
2IM 77J04H07-02E 3rd Edition June 29, 2018-00

4. PART NAMES OF FRONT PANEL
The gure below shows the MH7D with its front panel (cover)
being open.
For Output-1
For Output-2
Zero-adjustment volume
Span-adjustment volume
Zero-adjustment volume
Span-adjustment volume
Power indicator lamp
Turns on at power on.
5. MAINTENANCE
The product starts running immediately when the power is turned
on; however, it needs 10 to 15 minutes of warm-up before it
meets the specied performance.
5.1 Calibration Apparatus
• A DC voltage/current standard (Yokogawa GS200 or the
equivalent)
• A digital multimater (Yokogawa DM7560 or the equivalent)
• A precision resistor of 250 Ω ± 0.01%, 1 W
5.2 Calibration Procedure
(1) Connect the instruments as shown below. First adjust the
output-1 signal and then the output-2 signal.
(2) Use the DC voltage/current standard and apply input signals
equivalent to 0, 25, 50, 75, and 100% of the input span to the
product. Check to see the corresponding output voltages are
0, 25, 50, 75, and 100% respectively and within the specied
accuracy rating. “R” is used for current output.
• If the output signals are out of the accuracy rating range,
adjust the output signal level using the zero and span
adjustment volumes on front face of the product.
10 11 1 2
39
8 7 6 5
4
9
7
8
1
2
Ro
Ri
10
11
Ro
5
6
Ro : 250 Ω precision resistor
for current output
Ro
: 250 Ω precision resistor
for current output
Power supply
Output-2
Input
Output-1
Receiving resistor
for current input
2
1
2
1
L1
N2
GND
DC voltge/
current
standard
Digital
multimater
2
1
Digital
multimater
Ri: 250 Ω
external receiving
resistor for current input
(RES-250)
6. TRANSPORT AND STORAGE CONDITIONS
• Temperature: -25 to 70°C
• Temperature change rate: 20°C per hour or less
• Humidity: 5 to 95%RH (no condensation)
CAUTION
Keep this product in a conductive bag when plugged
out, during transport or storage.
3IM 77J04H07-02E 3rd Edition June 29, 2018-00

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