YOKOGAWA JUXTA MA7 User manual

Model MA7
Distributor
(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 MA7 Distributor (User’s Manual) IM 77J04A07-01E
(This manual)
Model MA7 Distributor (General Specications) GS 77J04A07-01E
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.
QR Code
The product has a QR Code pasted for e󰀩cient plant
maintenance work and asset information management.
It enables conrming the specications of purchased products
and user’s manuals.
For more details, please refer to the following URL.
https://www.yokogawa.com/qr-code
* QR Code is a registered trademark of DENSO WAVE
INCORPORATED.
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:
• MA7: 1 unit
Standard Accessories:
• Spacer (used for DIN rail mounting): 1 piece
• Socket (A1653MR): 1 piece (when /SN option is not
specied.)
• User’s Manual (this manual: IM 77J04A07-01E): 1 copy
IM 77J04A07-01E
4th Edition June 2021 (YK)
GENERAL
The MA7 is a plug-in type distributor that is used in combination
with a two-wire type transmitter to convert the transmitter’s 4 to
20 mA DC signals into isolated 4 to 20 mA DC current or 1 to 5 V
DC voltage signals.
MODEL AND SUFFIX CODES
Model Su󰀩x codes Description
MA7 -A x -x /x Distributor
Input
signal -A 4 to 20 mA DC Transmitter power supply: 25.25±0.25 V DC
Output 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
Note: An exclusive User’s Manual might be attached to the
products whose su󰀩x codes or option codes contain the code
“Z” (made to customers’ specications). Please read it along
with this manual.
User’s
Manual
1
Please read through this User’s Manual before use for correct handling.
Please keep this User’s Manual for future reference.
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
Mounting screws
Mounting Dimensions
Unit: mm
40±0.2
Pitch: 56 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.
Main unit
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 vibrations, corrosive gases, dust, water, oil,
solvents, direct sunlight, radiation, a strong electric eld,
and/or a strong magnetic eld, direct radiant heat, wind,
temperature uctuation, 2000 m or more above sea level.
• 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.
• Operating temperature/humidity range: 0 to 50°C (0 to 40 °C
for multiple mounting)/5 to 90%RH (no condensation)
* If the previous model (style S3.xx earlier) is installed
together, the ambient temperature is 0 to 40°C.
• Continuous vibration: (at 5 to 9 Hz) Half amplitude of 3 mm or
less (at 9 to 150 Hz) 9.8m/s2 or less, 1 oct/min for 90 minutes
each in the three axis directions
• Impact: 98 m/s2 or less, 11 ms, 3 axes, 6 directions, 3 times
each
• Install in a place where rigidity is secured.
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.
6 5 4 3
7 8 1 2
L+
N–
GND
5
3
4
PS+
COM
––
+5
3
4
3
4
–
+
1
2
+
–
6
7
8
Output
Input
Power supply
When using
internal
power supply
When using
external
power supply
TransmitterTransmitter Transmitter
When using as
an isolator
+
–
+
–
+
–
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. 6) 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 77J04A07-01E 4th Edition

4. PART NAMES OF FRONT PANEL
The gure below shows the MA7 with its front panel (cover) being
open.
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.
(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.
6 5 4 3
7 8 1 2
1
2
R
6
7
8
5
32
1
2
1
2
1
3
4
R: 250 Ω precision resistor
for current output
Power supply
Input
With SINK current
Without SINK current
Output
L1
N2
GND
DC voltge/
current
standard
DC voltge/
current
standard
Digital
multimater
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 77J04A07-01E 4th Edition

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